mirror of
https://github.com/Lime3DS/Lime3DS
synced 2024-12-29 02:22:37 -06:00
1104 lines
46 KiB
C++
1104 lines
46 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <algorithm>
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#include "common/color.h"
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#include "common/common_types.h"
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#include "common/math_util.h"
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#include "common/profiler.h"
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#include "core/hw/gpu.h"
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#include "core/memory.h"
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#include "debug_utils/debug_utils.h"
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#include "math.h"
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#include "pica.h"
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#include "rasterizer.h"
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#include "vertex_shader.h"
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#include "video_core/utils.h"
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namespace Pica {
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namespace Rasterizer {
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static void DrawPixel(int x, int y, const Math::Vec4<u8>& color) {
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const auto& framebuffer = g_state.regs.framebuffer;
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const PAddr addr = framebuffer.GetColorBufferPhysicalAddress();
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// Similarly to textures, the render framebuffer is laid out from bottom to top, too.
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// NOTE: The framebuffer height register contains the actual FB height minus one.
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y = framebuffer.height - y;
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const u32 coarse_y = y & ~7;
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u32 bytes_per_pixel = GPU::Regs::BytesPerPixel(GPU::Regs::PixelFormat(framebuffer.color_format.Value()));
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u32 dst_offset = VideoCore::GetMortonOffset(x, y, bytes_per_pixel) + coarse_y * framebuffer.width * bytes_per_pixel;
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u8* dst_pixel = Memory::GetPhysicalPointer(addr) + dst_offset;
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switch (framebuffer.color_format) {
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case Regs::ColorFormat::RGBA8:
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Color::EncodeRGBA8(color, dst_pixel);
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break;
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case Regs::ColorFormat::RGB8:
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Color::EncodeRGB8(color, dst_pixel);
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break;
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case Regs::ColorFormat::RGB5A1:
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Color::EncodeRGB5A1(color, dst_pixel);
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break;
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case Regs::ColorFormat::RGB565:
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Color::EncodeRGB565(color, dst_pixel);
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break;
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case Regs::ColorFormat::RGBA4:
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Color::EncodeRGBA4(color, dst_pixel);
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break;
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default:
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LOG_CRITICAL(Render_Software, "Unknown framebuffer color format %x", framebuffer.color_format.Value());
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UNIMPLEMENTED();
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}
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}
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static const Math::Vec4<u8> GetPixel(int x, int y) {
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const auto& framebuffer = g_state.regs.framebuffer;
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const PAddr addr = framebuffer.GetColorBufferPhysicalAddress();
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y = framebuffer.height - y;
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const u32 coarse_y = y & ~7;
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u32 bytes_per_pixel = GPU::Regs::BytesPerPixel(GPU::Regs::PixelFormat(framebuffer.color_format.Value()));
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u32 src_offset = VideoCore::GetMortonOffset(x, y, bytes_per_pixel) + coarse_y * framebuffer.width * bytes_per_pixel;
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u8* src_pixel = Memory::GetPhysicalPointer(addr) + src_offset;
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switch (framebuffer.color_format) {
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case Regs::ColorFormat::RGBA8:
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return Color::DecodeRGBA8(src_pixel);
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case Regs::ColorFormat::RGB8:
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return Color::DecodeRGB8(src_pixel);
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case Regs::ColorFormat::RGB5A1:
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return Color::DecodeRGB5A1(src_pixel);
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case Regs::ColorFormat::RGB565:
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return Color::DecodeRGB565(src_pixel);
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case Regs::ColorFormat::RGBA4:
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return Color::DecodeRGBA4(src_pixel);
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default:
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LOG_CRITICAL(Render_Software, "Unknown framebuffer color format %x", framebuffer.color_format.Value());
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UNIMPLEMENTED();
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}
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return {0, 0, 0, 0};
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}
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static u32 GetDepth(int x, int y) {
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const auto& framebuffer = g_state.regs.framebuffer;
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const PAddr addr = framebuffer.GetDepthBufferPhysicalAddress();
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u8* depth_buffer = Memory::GetPhysicalPointer(addr);
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y = framebuffer.height - y;
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const u32 coarse_y = y & ~7;
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u32 bytes_per_pixel = Regs::BytesPerDepthPixel(framebuffer.depth_format);
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u32 stride = framebuffer.width * bytes_per_pixel;
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u32 src_offset = VideoCore::GetMortonOffset(x, y, bytes_per_pixel) + coarse_y * stride;
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u8* src_pixel = depth_buffer + src_offset;
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switch (framebuffer.depth_format) {
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case Regs::DepthFormat::D16:
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return Color::DecodeD16(src_pixel);
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case Regs::DepthFormat::D24:
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return Color::DecodeD24(src_pixel);
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case Regs::DepthFormat::D24S8:
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return Color::DecodeD24S8(src_pixel).x;
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default:
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LOG_CRITICAL(HW_GPU, "Unimplemented depth format %u", framebuffer.depth_format);
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UNIMPLEMENTED();
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return 0;
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}
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}
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static u8 GetStencil(int x, int y) {
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const auto& framebuffer = g_state.regs.framebuffer;
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const PAddr addr = framebuffer.GetDepthBufferPhysicalAddress();
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u8* depth_buffer = Memory::GetPhysicalPointer(addr);
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y = framebuffer.height - y;
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const u32 coarse_y = y & ~7;
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u32 bytes_per_pixel = Pica::Regs::BytesPerDepthPixel(framebuffer.depth_format);
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u32 stride = framebuffer.width * bytes_per_pixel;
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u32 src_offset = VideoCore::GetMortonOffset(x, y, bytes_per_pixel) + coarse_y * stride;
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u8* src_pixel = depth_buffer + src_offset;
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switch (framebuffer.depth_format) {
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case Regs::DepthFormat::D24S8:
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return Color::DecodeD24S8(src_pixel).y;
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default:
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LOG_WARNING(HW_GPU, "GetStencil called for function which doesn't have a stencil component (format %u)", framebuffer.depth_format);
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return 0;
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}
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}
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static void SetDepth(int x, int y, u32 value) {
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const auto& framebuffer = g_state.regs.framebuffer;
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const PAddr addr = framebuffer.GetDepthBufferPhysicalAddress();
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u8* depth_buffer = Memory::GetPhysicalPointer(addr);
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y = framebuffer.height - y;
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const u32 coarse_y = y & ~7;
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u32 bytes_per_pixel = Regs::BytesPerDepthPixel(framebuffer.depth_format);
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u32 stride = framebuffer.width * bytes_per_pixel;
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u32 dst_offset = VideoCore::GetMortonOffset(x, y, bytes_per_pixel) + coarse_y * stride;
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u8* dst_pixel = depth_buffer + dst_offset;
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switch (framebuffer.depth_format) {
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case Regs::DepthFormat::D16:
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Color::EncodeD16(value, dst_pixel);
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break;
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case Regs::DepthFormat::D24:
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Color::EncodeD24(value, dst_pixel);
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break;
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case Regs::DepthFormat::D24S8:
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Color::EncodeD24X8(value, dst_pixel);
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break;
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default:
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LOG_CRITICAL(HW_GPU, "Unimplemented depth format %u", framebuffer.depth_format);
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UNIMPLEMENTED();
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break;
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}
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}
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static void SetStencil(int x, int y, u8 value) {
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const auto& framebuffer = g_state.regs.framebuffer;
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const PAddr addr = framebuffer.GetDepthBufferPhysicalAddress();
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u8* depth_buffer = Memory::GetPhysicalPointer(addr);
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y = framebuffer.height - y;
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const u32 coarse_y = y & ~7;
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u32 bytes_per_pixel = Pica::Regs::BytesPerDepthPixel(framebuffer.depth_format);
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u32 stride = framebuffer.width * bytes_per_pixel;
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u32 dst_offset = VideoCore::GetMortonOffset(x, y, bytes_per_pixel) + coarse_y * stride;
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u8* dst_pixel = depth_buffer + dst_offset;
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switch (framebuffer.depth_format) {
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case Pica::Regs::DepthFormat::D16:
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case Pica::Regs::DepthFormat::D24:
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// Nothing to do
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break;
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case Pica::Regs::DepthFormat::D24S8:
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Color::EncodeX24S8(value, dst_pixel);
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break;
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default:
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LOG_CRITICAL(HW_GPU, "Unimplemented depth format %u", framebuffer.depth_format);
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UNIMPLEMENTED();
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break;
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}
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}
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// TODO: Should the stencil mask be applied to the "dest" or "ref" operands? Most likely not!
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static u8 PerformStencilAction(Regs::StencilAction action, u8 dest, u8 ref) {
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switch (action) {
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case Regs::StencilAction::Keep:
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return dest;
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case Regs::StencilAction::Xor:
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return dest ^ ref;
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default:
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LOG_CRITICAL(HW_GPU, "Unknown stencil action %x", (int)action);
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UNIMPLEMENTED();
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return 0;
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}
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}
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// NOTE: Assuming that rasterizer coordinates are 12.4 fixed-point values
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struct Fix12P4 {
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Fix12P4() {}
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Fix12P4(u16 val) : val(val) {}
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static u16 FracMask() { return 0xF; }
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static u16 IntMask() { return (u16)~0xF; }
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operator u16() const {
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return val;
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}
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bool operator < (const Fix12P4& oth) const {
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return (u16)*this < (u16)oth;
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}
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private:
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u16 val;
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};
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/**
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* Calculate signed area of the triangle spanned by the three argument vertices.
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* The sign denotes an orientation.
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*
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* @todo define orientation concretely.
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*/
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static int SignedArea (const Math::Vec2<Fix12P4>& vtx1,
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const Math::Vec2<Fix12P4>& vtx2,
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const Math::Vec2<Fix12P4>& vtx3) {
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const auto vec1 = Math::MakeVec(vtx2 - vtx1, 0);
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const auto vec2 = Math::MakeVec(vtx3 - vtx1, 0);
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// TODO: There is a very small chance this will overflow for sizeof(int) == 4
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return Math::Cross(vec1, vec2).z;
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};
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static Common::Profiling::TimingCategory rasterization_category("Rasterization");
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/**
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* Helper function for ProcessTriangle with the "reversed" flag to allow for implementing
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* culling via recursion.
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*/
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static void ProcessTriangleInternal(const VertexShader::OutputVertex& v0,
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const VertexShader::OutputVertex& v1,
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const VertexShader::OutputVertex& v2,
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bool reversed = false)
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{
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const auto& regs = g_state.regs;
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Common::Profiling::ScopeTimer timer(rasterization_category);
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// vertex positions in rasterizer coordinates
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static auto FloatToFix = [](float24 flt) {
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// TODO: Rounding here is necessary to prevent garbage pixels at
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// triangle borders. Is it that the correct solution, though?
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return Fix12P4(static_cast<unsigned short>(round(flt.ToFloat32() * 16.0f)));
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};
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static auto ScreenToRasterizerCoordinates = [](const Math::Vec3<float24>& vec) {
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return Math::Vec3<Fix12P4>{FloatToFix(vec.x), FloatToFix(vec.y), FloatToFix(vec.z)};
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};
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Math::Vec3<Fix12P4> vtxpos[3]{ ScreenToRasterizerCoordinates(v0.screenpos),
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ScreenToRasterizerCoordinates(v1.screenpos),
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ScreenToRasterizerCoordinates(v2.screenpos) };
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if (regs.cull_mode == Regs::CullMode::KeepAll) {
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// Make sure we always end up with a triangle wound counter-clockwise
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if (!reversed && SignedArea(vtxpos[0].xy(), vtxpos[1].xy(), vtxpos[2].xy()) <= 0) {
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ProcessTriangleInternal(v0, v2, v1, true);
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return;
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}
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} else {
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if (!reversed && regs.cull_mode == Regs::CullMode::KeepClockWise) {
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// Reverse vertex order and use the CCW code path.
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ProcessTriangleInternal(v0, v2, v1, true);
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return;
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}
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// Cull away triangles which are wound clockwise.
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if (SignedArea(vtxpos[0].xy(), vtxpos[1].xy(), vtxpos[2].xy()) <= 0)
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return;
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}
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// TODO: Proper scissor rect test!
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u16 min_x = std::min({vtxpos[0].x, vtxpos[1].x, vtxpos[2].x});
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u16 min_y = std::min({vtxpos[0].y, vtxpos[1].y, vtxpos[2].y});
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u16 max_x = std::max({vtxpos[0].x, vtxpos[1].x, vtxpos[2].x});
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u16 max_y = std::max({vtxpos[0].y, vtxpos[1].y, vtxpos[2].y});
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min_x &= Fix12P4::IntMask();
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min_y &= Fix12P4::IntMask();
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max_x = ((max_x + Fix12P4::FracMask()) & Fix12P4::IntMask());
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max_y = ((max_y + Fix12P4::FracMask()) & Fix12P4::IntMask());
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// Triangle filling rules: Pixels on the right-sided edge or on flat bottom edges are not
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// drawn. Pixels on any other triangle border are drawn. This is implemented with three bias
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// values which are added to the barycentric coordinates w0, w1 and w2, respectively.
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// NOTE: These are the PSP filling rules. Not sure if the 3DS uses the same ones...
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auto IsRightSideOrFlatBottomEdge = [](const Math::Vec2<Fix12P4>& vtx,
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const Math::Vec2<Fix12P4>& line1,
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const Math::Vec2<Fix12P4>& line2)
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{
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if (line1.y == line2.y) {
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// just check if vertex is above us => bottom line parallel to x-axis
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return vtx.y < line1.y;
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} else {
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// check if vertex is on our left => right side
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// TODO: Not sure how likely this is to overflow
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return (int)vtx.x < (int)line1.x + ((int)line2.x - (int)line1.x) * ((int)vtx.y - (int)line1.y) / ((int)line2.y - (int)line1.y);
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}
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};
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int bias0 = IsRightSideOrFlatBottomEdge(vtxpos[0].xy(), vtxpos[1].xy(), vtxpos[2].xy()) ? -1 : 0;
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int bias1 = IsRightSideOrFlatBottomEdge(vtxpos[1].xy(), vtxpos[2].xy(), vtxpos[0].xy()) ? -1 : 0;
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int bias2 = IsRightSideOrFlatBottomEdge(vtxpos[2].xy(), vtxpos[0].xy(), vtxpos[1].xy()) ? -1 : 0;
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auto w_inverse = Math::MakeVec(v0.pos.w, v1.pos.w, v2.pos.w);
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auto textures = regs.GetTextures();
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auto tev_stages = regs.GetTevStages();
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bool stencil_action_enable = g_state.regs.output_merger.stencil_test.enable && g_state.regs.framebuffer.depth_format == Regs::DepthFormat::D24S8;
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const auto stencil_test = g_state.regs.output_merger.stencil_test;
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// Enter rasterization loop, starting at the center of the topleft bounding box corner.
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// TODO: Not sure if looping through x first might be faster
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for (u16 y = min_y + 8; y < max_y; y += 0x10) {
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for (u16 x = min_x + 8; x < max_x; x += 0x10) {
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// Calculate the barycentric coordinates w0, w1 and w2
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int w0 = bias0 + SignedArea(vtxpos[1].xy(), vtxpos[2].xy(), {x, y});
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int w1 = bias1 + SignedArea(vtxpos[2].xy(), vtxpos[0].xy(), {x, y});
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int w2 = bias2 + SignedArea(vtxpos[0].xy(), vtxpos[1].xy(), {x, y});
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int wsum = w0 + w1 + w2;
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// If current pixel is not covered by the current primitive
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if (w0 < 0 || w1 < 0 || w2 < 0)
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continue;
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auto baricentric_coordinates = Math::MakeVec(float24::FromFloat32(static_cast<float>(w0)),
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float24::FromFloat32(static_cast<float>(w1)),
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float24::FromFloat32(static_cast<float>(w2)));
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float24 interpolated_w_inverse = float24::FromFloat32(1.0f) / Math::Dot(w_inverse, baricentric_coordinates);
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// Perspective correct attribute interpolation:
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// Attribute values cannot be calculated by simple linear interpolation since
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// they are not linear in screen space. For example, when interpolating a
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// texture coordinate across two vertices, something simple like
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// u = (u0*w0 + u1*w1)/(w0+w1)
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// will not work. However, the attribute value divided by the
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// clipspace w-coordinate (u/w) and and the inverse w-coordinate (1/w) are linear
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// in screenspace. Hence, we can linearly interpolate these two independently and
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// calculate the interpolated attribute by dividing the results.
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// I.e.
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// u_over_w = ((u0/v0.pos.w)*w0 + (u1/v1.pos.w)*w1)/(w0+w1)
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// one_over_w = (( 1/v0.pos.w)*w0 + ( 1/v1.pos.w)*w1)/(w0+w1)
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// u = u_over_w / one_over_w
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//
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// The generalization to three vertices is straightforward in baricentric coordinates.
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auto GetInterpolatedAttribute = [&](float24 attr0, float24 attr1, float24 attr2) {
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auto attr_over_w = Math::MakeVec(attr0, attr1, attr2);
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float24 interpolated_attr_over_w = Math::Dot(attr_over_w, baricentric_coordinates);
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return interpolated_attr_over_w * interpolated_w_inverse;
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};
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Math::Vec4<u8> primary_color{
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(u8)(GetInterpolatedAttribute(v0.color.r(), v1.color.r(), v2.color.r()).ToFloat32() * 255),
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(u8)(GetInterpolatedAttribute(v0.color.g(), v1.color.g(), v2.color.g()).ToFloat32() * 255),
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(u8)(GetInterpolatedAttribute(v0.color.b(), v1.color.b(), v2.color.b()).ToFloat32() * 255),
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(u8)(GetInterpolatedAttribute(v0.color.a(), v1.color.a(), v2.color.a()).ToFloat32() * 255)
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};
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Math::Vec2<float24> uv[3];
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uv[0].u() = GetInterpolatedAttribute(v0.tc0.u(), v1.tc0.u(), v2.tc0.u());
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uv[0].v() = GetInterpolatedAttribute(v0.tc0.v(), v1.tc0.v(), v2.tc0.v());
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uv[1].u() = GetInterpolatedAttribute(v0.tc1.u(), v1.tc1.u(), v2.tc1.u());
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uv[1].v() = GetInterpolatedAttribute(v0.tc1.v(), v1.tc1.v(), v2.tc1.v());
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uv[2].u() = GetInterpolatedAttribute(v0.tc2.u(), v1.tc2.u(), v2.tc2.u());
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uv[2].v() = GetInterpolatedAttribute(v0.tc2.v(), v1.tc2.v(), v2.tc2.v());
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Math::Vec4<u8> texture_color[3]{};
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for (int i = 0; i < 3; ++i) {
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const auto& texture = textures[i];
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if (!texture.enabled)
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continue;
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DEBUG_ASSERT(0 != texture.config.address);
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int s = (int)(uv[i].u() * float24::FromFloat32(static_cast<float>(texture.config.width))).ToFloat32();
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int t = (int)(uv[i].v() * float24::FromFloat32(static_cast<float>(texture.config.height))).ToFloat32();
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static auto GetWrappedTexCoord = [](Regs::TextureConfig::WrapMode mode, int val, unsigned size) {
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switch (mode) {
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case Regs::TextureConfig::ClampToEdge:
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val = std::max(val, 0);
|
|
val = std::min(val, (int)size - 1);
|
|
return val;
|
|
|
|
case Regs::TextureConfig::ClampToBorder:
|
|
return val;
|
|
|
|
case Regs::TextureConfig::Repeat:
|
|
return (int)((unsigned)val % size);
|
|
|
|
case Regs::TextureConfig::MirroredRepeat:
|
|
{
|
|
unsigned int coord = ((unsigned)val % (2 * size));
|
|
if (coord >= size)
|
|
coord = 2 * size - 1 - coord;
|
|
return (int)coord;
|
|
}
|
|
|
|
default:
|
|
LOG_ERROR(HW_GPU, "Unknown texture coordinate wrapping mode %x\n", (int)mode);
|
|
UNIMPLEMENTED();
|
|
return 0;
|
|
}
|
|
};
|
|
|
|
if ((texture.config.wrap_s == Regs::TextureConfig::ClampToBorder && (s < 0 || s >= texture.config.width))
|
|
|| (texture.config.wrap_t == Regs::TextureConfig::ClampToBorder && (t < 0 || t >= texture.config.height))) {
|
|
auto border_color = texture.config.border_color;
|
|
texture_color[i] = { border_color.r, border_color.g, border_color.b, border_color.a };
|
|
} else {
|
|
// Textures are laid out from bottom to top, hence we invert the t coordinate.
|
|
// NOTE: This may not be the right place for the inversion.
|
|
// TODO: Check if this applies to ETC textures, too.
|
|
s = GetWrappedTexCoord(texture.config.wrap_s, s, texture.config.width);
|
|
t = texture.config.height - 1 - GetWrappedTexCoord(texture.config.wrap_t, t, texture.config.height);
|
|
|
|
u8* texture_data = Memory::GetPhysicalPointer(texture.config.GetPhysicalAddress());
|
|
auto info = DebugUtils::TextureInfo::FromPicaRegister(texture.config, texture.format);
|
|
|
|
texture_color[i] = DebugUtils::LookupTexture(texture_data, s, t, info);
|
|
DebugUtils::DumpTexture(texture.config, texture_data);
|
|
}
|
|
}
|
|
|
|
// Texture environment - consists of 6 stages of color and alpha combining.
|
|
//
|
|
// Color combiners take three input color values from some source (e.g. interpolated
|
|
// vertex color, texture color, previous stage, etc), perform some very simple
|
|
// operations on each of them (e.g. inversion) and then calculate the output color
|
|
// with some basic arithmetic. Alpha combiners can be configured separately but work
|
|
// analogously.
|
|
Math::Vec4<u8> combiner_output;
|
|
Math::Vec4<u8> combiner_buffer = {
|
|
regs.tev_combiner_buffer_color.r, regs.tev_combiner_buffer_color.g,
|
|
regs.tev_combiner_buffer_color.b, regs.tev_combiner_buffer_color.a
|
|
};
|
|
|
|
for (unsigned tev_stage_index = 0; tev_stage_index < tev_stages.size(); ++tev_stage_index) {
|
|
const auto& tev_stage = tev_stages[tev_stage_index];
|
|
using Source = Regs::TevStageConfig::Source;
|
|
using ColorModifier = Regs::TevStageConfig::ColorModifier;
|
|
using AlphaModifier = Regs::TevStageConfig::AlphaModifier;
|
|
using Operation = Regs::TevStageConfig::Operation;
|
|
|
|
auto GetSource = [&](Source source) -> Math::Vec4<u8> {
|
|
switch (source) {
|
|
case Source::PrimaryColor:
|
|
|
|
// HACK: Until we implement fragment lighting, use primary_color
|
|
case Source::PrimaryFragmentColor:
|
|
return primary_color;
|
|
|
|
// HACK: Until we implement fragment lighting, use zero
|
|
case Source::SecondaryFragmentColor:
|
|
return {0, 0, 0, 0};
|
|
|
|
case Source::Texture0:
|
|
return texture_color[0];
|
|
|
|
case Source::Texture1:
|
|
return texture_color[1];
|
|
|
|
case Source::Texture2:
|
|
return texture_color[2];
|
|
|
|
case Source::PreviousBuffer:
|
|
return combiner_buffer;
|
|
|
|
case Source::Constant:
|
|
return {tev_stage.const_r, tev_stage.const_g, tev_stage.const_b, tev_stage.const_a};
|
|
|
|
case Source::Previous:
|
|
return combiner_output;
|
|
|
|
default:
|
|
LOG_ERROR(HW_GPU, "Unknown color combiner source %d\n", (int)source);
|
|
UNIMPLEMENTED();
|
|
return {0, 0, 0, 0};
|
|
}
|
|
};
|
|
|
|
static auto GetColorModifier = [](ColorModifier factor, const Math::Vec4<u8>& values) -> Math::Vec3<u8> {
|
|
switch (factor) {
|
|
case ColorModifier::SourceColor:
|
|
return values.rgb();
|
|
|
|
case ColorModifier::OneMinusSourceColor:
|
|
return (Math::Vec3<u8>(255, 255, 255) - values.rgb()).Cast<u8>();
|
|
|
|
case ColorModifier::SourceAlpha:
|
|
return values.aaa();
|
|
|
|
case ColorModifier::OneMinusSourceAlpha:
|
|
return (Math::Vec3<u8>(255, 255, 255) - values.aaa()).Cast<u8>();
|
|
|
|
case ColorModifier::SourceRed:
|
|
return values.rrr();
|
|
|
|
case ColorModifier::OneMinusSourceRed:
|
|
return (Math::Vec3<u8>(255, 255, 255) - values.rrr()).Cast<u8>();
|
|
|
|
case ColorModifier::SourceGreen:
|
|
return values.ggg();
|
|
|
|
case ColorModifier::OneMinusSourceGreen:
|
|
return (Math::Vec3<u8>(255, 255, 255) - values.ggg()).Cast<u8>();
|
|
|
|
case ColorModifier::SourceBlue:
|
|
return values.bbb();
|
|
|
|
case ColorModifier::OneMinusSourceBlue:
|
|
return (Math::Vec3<u8>(255, 255, 255) - values.bbb()).Cast<u8>();
|
|
}
|
|
};
|
|
|
|
static auto GetAlphaModifier = [](AlphaModifier factor, const Math::Vec4<u8>& values) -> u8 {
|
|
switch (factor) {
|
|
case AlphaModifier::SourceAlpha:
|
|
return values.a();
|
|
|
|
case AlphaModifier::OneMinusSourceAlpha:
|
|
return 255 - values.a();
|
|
|
|
case AlphaModifier::SourceRed:
|
|
return values.r();
|
|
|
|
case AlphaModifier::OneMinusSourceRed:
|
|
return 255 - values.r();
|
|
|
|
case AlphaModifier::SourceGreen:
|
|
return values.g();
|
|
|
|
case AlphaModifier::OneMinusSourceGreen:
|
|
return 255 - values.g();
|
|
|
|
case AlphaModifier::SourceBlue:
|
|
return values.b();
|
|
|
|
case AlphaModifier::OneMinusSourceBlue:
|
|
return 255 - values.b();
|
|
}
|
|
};
|
|
|
|
static auto ColorCombine = [](Operation op, const Math::Vec3<u8> input[3]) -> Math::Vec3<u8> {
|
|
switch (op) {
|
|
case Operation::Replace:
|
|
return input[0];
|
|
|
|
case Operation::Modulate:
|
|
return ((input[0] * input[1]) / 255).Cast<u8>();
|
|
|
|
case Operation::Add:
|
|
{
|
|
auto result = input[0] + input[1];
|
|
result.r() = std::min(255, result.r());
|
|
result.g() = std::min(255, result.g());
|
|
result.b() = std::min(255, result.b());
|
|
return result.Cast<u8>();
|
|
}
|
|
|
|
case Operation::AddSigned:
|
|
{
|
|
// TODO(bunnei): Verify that the color conversion from (float) 0.5f to (byte) 128 is correct
|
|
auto result = input[0].Cast<int>() + input[1].Cast<int>() - Math::MakeVec<int>(128, 128, 128);
|
|
result.r() = MathUtil::Clamp<int>(result.r(), 0, 255);
|
|
result.g() = MathUtil::Clamp<int>(result.g(), 0, 255);
|
|
result.b() = MathUtil::Clamp<int>(result.b(), 0, 255);
|
|
return result.Cast<u8>();
|
|
}
|
|
|
|
case Operation::Lerp:
|
|
return ((input[0] * input[2] + input[1] * (Math::MakeVec<u8>(255, 255, 255) - input[2]).Cast<u8>()) / 255).Cast<u8>();
|
|
|
|
case Operation::Subtract:
|
|
{
|
|
auto result = input[0].Cast<int>() - input[1].Cast<int>();
|
|
result.r() = std::max(0, result.r());
|
|
result.g() = std::max(0, result.g());
|
|
result.b() = std::max(0, result.b());
|
|
return result.Cast<u8>();
|
|
}
|
|
|
|
case Operation::MultiplyThenAdd:
|
|
{
|
|
auto result = (input[0] * input[1] + 255 * input[2].Cast<int>()) / 255;
|
|
result.r() = std::min(255, result.r());
|
|
result.g() = std::min(255, result.g());
|
|
result.b() = std::min(255, result.b());
|
|
return result.Cast<u8>();
|
|
}
|
|
|
|
case Operation::AddThenMultiply:
|
|
{
|
|
auto result = input[0] + input[1];
|
|
result.r() = std::min(255, result.r());
|
|
result.g() = std::min(255, result.g());
|
|
result.b() = std::min(255, result.b());
|
|
result = (result * input[2].Cast<int>()) / 255;
|
|
return result.Cast<u8>();
|
|
}
|
|
|
|
default:
|
|
LOG_ERROR(HW_GPU, "Unknown color combiner operation %d\n", (int)op);
|
|
UNIMPLEMENTED();
|
|
return {0, 0, 0};
|
|
}
|
|
};
|
|
|
|
static auto AlphaCombine = [](Operation op, const std::array<u8,3>& input) -> u8 {
|
|
switch (op) {
|
|
case Operation::Replace:
|
|
return input[0];
|
|
|
|
case Operation::Modulate:
|
|
return input[0] * input[1] / 255;
|
|
|
|
case Operation::Add:
|
|
return std::min(255, input[0] + input[1]);
|
|
|
|
case Operation::AddSigned:
|
|
{
|
|
// TODO(bunnei): Verify that the color conversion from (float) 0.5f to (byte) 128 is correct
|
|
auto result = static_cast<int>(input[0]) + static_cast<int>(input[1]) - 128;
|
|
return static_cast<u8>(MathUtil::Clamp<int>(result, 0, 255));
|
|
}
|
|
|
|
case Operation::Lerp:
|
|
return (input[0] * input[2] + input[1] * (255 - input[2])) / 255;
|
|
|
|
case Operation::Subtract:
|
|
return std::max(0, (int)input[0] - (int)input[1]);
|
|
|
|
case Operation::MultiplyThenAdd:
|
|
return std::min(255, (input[0] * input[1] + 255 * input[2]) / 255);
|
|
|
|
case Operation::AddThenMultiply:
|
|
return (std::min(255, (input[0] + input[1])) * input[2]) / 255;
|
|
|
|
default:
|
|
LOG_ERROR(HW_GPU, "Unknown alpha combiner operation %d\n", (int)op);
|
|
UNIMPLEMENTED();
|
|
return 0;
|
|
}
|
|
};
|
|
|
|
// color combiner
|
|
// NOTE: Not sure if the alpha combiner might use the color output of the previous
|
|
// stage as input. Hence, we currently don't directly write the result to
|
|
// combiner_output.rgb(), but instead store it in a temporary variable until
|
|
// alpha combining has been done.
|
|
Math::Vec3<u8> color_result[3] = {
|
|
GetColorModifier(tev_stage.color_modifier1, GetSource(tev_stage.color_source1)),
|
|
GetColorModifier(tev_stage.color_modifier2, GetSource(tev_stage.color_source2)),
|
|
GetColorModifier(tev_stage.color_modifier3, GetSource(tev_stage.color_source3))
|
|
};
|
|
auto color_output = ColorCombine(tev_stage.color_op, color_result);
|
|
|
|
// alpha combiner
|
|
std::array<u8,3> alpha_result = {
|
|
GetAlphaModifier(tev_stage.alpha_modifier1, GetSource(tev_stage.alpha_source1)),
|
|
GetAlphaModifier(tev_stage.alpha_modifier2, GetSource(tev_stage.alpha_source2)),
|
|
GetAlphaModifier(tev_stage.alpha_modifier3, GetSource(tev_stage.alpha_source3))
|
|
};
|
|
auto alpha_output = AlphaCombine(tev_stage.alpha_op, alpha_result);
|
|
|
|
combiner_output[0] = std::min((unsigned)255, color_output.r() * tev_stage.GetColorMultiplier());
|
|
combiner_output[1] = std::min((unsigned)255, color_output.g() * tev_stage.GetColorMultiplier());
|
|
combiner_output[2] = std::min((unsigned)255, color_output.b() * tev_stage.GetColorMultiplier());
|
|
combiner_output[3] = std::min((unsigned)255, alpha_output * tev_stage.GetAlphaMultiplier());
|
|
|
|
if (regs.tev_combiner_buffer_input.TevStageUpdatesCombinerBufferColor(tev_stage_index)) {
|
|
combiner_buffer.r() = combiner_output.r();
|
|
combiner_buffer.g() = combiner_output.g();
|
|
combiner_buffer.b() = combiner_output.b();
|
|
}
|
|
|
|
if (regs.tev_combiner_buffer_input.TevStageUpdatesCombinerBufferAlpha(tev_stage_index)) {
|
|
combiner_buffer.a() = combiner_output.a();
|
|
}
|
|
}
|
|
|
|
const auto& output_merger = regs.output_merger;
|
|
// TODO: Does alpha testing happen before or after stencil?
|
|
if (output_merger.alpha_test.enable) {
|
|
bool pass = false;
|
|
|
|
switch (output_merger.alpha_test.func) {
|
|
case Regs::CompareFunc::Never:
|
|
pass = false;
|
|
break;
|
|
|
|
case Regs::CompareFunc::Always:
|
|
pass = true;
|
|
break;
|
|
|
|
case Regs::CompareFunc::Equal:
|
|
pass = combiner_output.a() == output_merger.alpha_test.ref;
|
|
break;
|
|
|
|
case Regs::CompareFunc::NotEqual:
|
|
pass = combiner_output.a() != output_merger.alpha_test.ref;
|
|
break;
|
|
|
|
case Regs::CompareFunc::LessThan:
|
|
pass = combiner_output.a() < output_merger.alpha_test.ref;
|
|
break;
|
|
|
|
case Regs::CompareFunc::LessThanOrEqual:
|
|
pass = combiner_output.a() <= output_merger.alpha_test.ref;
|
|
break;
|
|
|
|
case Regs::CompareFunc::GreaterThan:
|
|
pass = combiner_output.a() > output_merger.alpha_test.ref;
|
|
break;
|
|
|
|
case Regs::CompareFunc::GreaterThanOrEqual:
|
|
pass = combiner_output.a() >= output_merger.alpha_test.ref;
|
|
break;
|
|
}
|
|
|
|
if (!pass)
|
|
continue;
|
|
}
|
|
|
|
u8 old_stencil = 0;
|
|
if (stencil_action_enable) {
|
|
old_stencil = GetStencil(x >> 4, y >> 4);
|
|
u8 dest = old_stencil & stencil_test.mask;
|
|
u8 ref = stencil_test.reference_value & stencil_test.mask;
|
|
|
|
bool pass = false;
|
|
switch (stencil_test.func) {
|
|
case Regs::CompareFunc::Never:
|
|
pass = false;
|
|
break;
|
|
|
|
case Regs::CompareFunc::Always:
|
|
pass = true;
|
|
break;
|
|
|
|
case Regs::CompareFunc::Equal:
|
|
pass = (ref == dest);
|
|
break;
|
|
|
|
case Regs::CompareFunc::NotEqual:
|
|
pass = (ref != dest);
|
|
break;
|
|
|
|
case Regs::CompareFunc::LessThan:
|
|
pass = (ref < dest);
|
|
break;
|
|
|
|
case Regs::CompareFunc::LessThanOrEqual:
|
|
pass = (ref <= dest);
|
|
break;
|
|
|
|
case Regs::CompareFunc::GreaterThan:
|
|
pass = (ref > dest);
|
|
break;
|
|
|
|
case Regs::CompareFunc::GreaterThanOrEqual:
|
|
pass = (ref >= dest);
|
|
break;
|
|
}
|
|
|
|
if (!pass) {
|
|
u8 new_stencil = PerformStencilAction(stencil_test.action_stencil_fail, old_stencil, stencil_test.replacement_value);
|
|
SetStencil(x >> 4, y >> 4, new_stencil);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
// TODO: Does depth indeed only get written even if depth testing is enabled?
|
|
if (output_merger.depth_test_enable) {
|
|
unsigned num_bits = Regs::DepthBitsPerPixel(regs.framebuffer.depth_format);
|
|
u32 z = (u32)((v0.screenpos[2].ToFloat32() * w0 +
|
|
v1.screenpos[2].ToFloat32() * w1 +
|
|
v2.screenpos[2].ToFloat32() * w2) * ((1 << num_bits) - 1) / wsum);
|
|
u32 ref_z = GetDepth(x >> 4, y >> 4);
|
|
|
|
bool pass = false;
|
|
|
|
switch (output_merger.depth_test_func) {
|
|
case Regs::CompareFunc::Never:
|
|
pass = false;
|
|
break;
|
|
|
|
case Regs::CompareFunc::Always:
|
|
pass = true;
|
|
break;
|
|
|
|
case Regs::CompareFunc::Equal:
|
|
pass = z == ref_z;
|
|
break;
|
|
|
|
case Regs::CompareFunc::NotEqual:
|
|
pass = z != ref_z;
|
|
break;
|
|
|
|
case Regs::CompareFunc::LessThan:
|
|
pass = z < ref_z;
|
|
break;
|
|
|
|
case Regs::CompareFunc::LessThanOrEqual:
|
|
pass = z <= ref_z;
|
|
break;
|
|
|
|
case Regs::CompareFunc::GreaterThan:
|
|
pass = z > ref_z;
|
|
break;
|
|
|
|
case Regs::CompareFunc::GreaterThanOrEqual:
|
|
pass = z >= ref_z;
|
|
break;
|
|
}
|
|
|
|
if (!pass) {
|
|
if (stencil_action_enable) {
|
|
u8 new_stencil = PerformStencilAction(stencil_test.action_depth_fail, old_stencil, stencil_test.replacement_value);
|
|
SetStencil(x >> 4, y >> 4, new_stencil);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
if (output_merger.depth_write_enable)
|
|
SetDepth(x >> 4, y >> 4, z);
|
|
|
|
if (stencil_action_enable) {
|
|
// TODO: What happens if stencil testing is enabled, but depth testing is not? Will stencil get updated anyway?
|
|
u8 new_stencil = PerformStencilAction(stencil_test.action_depth_pass, old_stencil, stencil_test.replacement_value);
|
|
SetStencil(x >> 4, y >> 4, new_stencil);
|
|
}
|
|
}
|
|
|
|
auto dest = GetPixel(x >> 4, y >> 4);
|
|
Math::Vec4<u8> blend_output = combiner_output;
|
|
|
|
if (output_merger.alphablend_enable) {
|
|
auto params = output_merger.alpha_blending;
|
|
|
|
auto LookupFactorRGB = [&](Regs::BlendFactor factor) -> Math::Vec3<u8> {
|
|
switch (factor) {
|
|
case Regs::BlendFactor::Zero :
|
|
return Math::Vec3<u8>(0, 0, 0);
|
|
|
|
case Regs::BlendFactor::One :
|
|
return Math::Vec3<u8>(255, 255, 255);
|
|
|
|
case Regs::BlendFactor::SourceColor:
|
|
return combiner_output.rgb();
|
|
|
|
case Regs::BlendFactor::OneMinusSourceColor:
|
|
return Math::Vec3<u8>(255 - combiner_output.r(), 255 - combiner_output.g(), 255 - combiner_output.b());
|
|
|
|
case Regs::BlendFactor::DestColor:
|
|
return dest.rgb();
|
|
|
|
case Regs::BlendFactor::OneMinusDestColor:
|
|
return Math::Vec3<u8>(255 - dest.r(), 255 - dest.g(), 255 - dest.b());
|
|
|
|
case Regs::BlendFactor::SourceAlpha:
|
|
return Math::Vec3<u8>(combiner_output.a(), combiner_output.a(), combiner_output.a());
|
|
|
|
case Regs::BlendFactor::OneMinusSourceAlpha:
|
|
return Math::Vec3<u8>(255 - combiner_output.a(), 255 - combiner_output.a(), 255 - combiner_output.a());
|
|
|
|
case Regs::BlendFactor::DestAlpha:
|
|
return Math::Vec3<u8>(dest.a(), dest.a(), dest.a());
|
|
|
|
case Regs::BlendFactor::OneMinusDestAlpha:
|
|
return Math::Vec3<u8>(255 - dest.a(), 255 - dest.a(), 255 - dest.a());
|
|
|
|
case Regs::BlendFactor::ConstantColor:
|
|
return Math::Vec3<u8>(output_merger.blend_const.r, output_merger.blend_const.g, output_merger.blend_const.b);
|
|
|
|
case Regs::BlendFactor::OneMinusConstantColor:
|
|
return Math::Vec3<u8>(255 - output_merger.blend_const.r, 255 - output_merger.blend_const.g, 255 - output_merger.blend_const.b);
|
|
|
|
case Regs::BlendFactor::ConstantAlpha:
|
|
return Math::Vec3<u8>(output_merger.blend_const.a, output_merger.blend_const.a, output_merger.blend_const.a);
|
|
|
|
case Regs::BlendFactor::OneMinusConstantAlpha:
|
|
return Math::Vec3<u8>(255 - output_merger.blend_const.a, 255 - output_merger.blend_const.a, 255 - output_merger.blend_const.a);
|
|
|
|
default:
|
|
LOG_CRITICAL(HW_GPU, "Unknown color blend factor %x", factor);
|
|
UNIMPLEMENTED();
|
|
break;
|
|
}
|
|
};
|
|
|
|
auto LookupFactorA = [&](Regs::BlendFactor factor) -> u8 {
|
|
switch (factor) {
|
|
case Regs::BlendFactor::Zero:
|
|
return 0;
|
|
|
|
case Regs::BlendFactor::One:
|
|
return 255;
|
|
|
|
case Regs::BlendFactor::SourceAlpha:
|
|
return combiner_output.a();
|
|
|
|
case Regs::BlendFactor::OneMinusSourceAlpha:
|
|
return 255 - combiner_output.a();
|
|
|
|
case Regs::BlendFactor::DestAlpha:
|
|
return dest.a();
|
|
|
|
case Regs::BlendFactor::OneMinusDestAlpha:
|
|
return 255 - dest.a();
|
|
|
|
case Regs::BlendFactor::ConstantAlpha:
|
|
return output_merger.blend_const.a;
|
|
|
|
case Regs::BlendFactor::OneMinusConstantAlpha:
|
|
return 255 - output_merger.blend_const.a;
|
|
|
|
default:
|
|
LOG_CRITICAL(HW_GPU, "Unknown alpha blend factor %x", factor);
|
|
UNIMPLEMENTED();
|
|
break;
|
|
}
|
|
};
|
|
|
|
static auto EvaluateBlendEquation = [](const Math::Vec4<u8>& src, const Math::Vec4<u8>& srcfactor,
|
|
const Math::Vec4<u8>& dest, const Math::Vec4<u8>& destfactor,
|
|
Regs::BlendEquation equation) {
|
|
Math::Vec4<int> result;
|
|
|
|
auto src_result = (src * srcfactor).Cast<int>();
|
|
auto dst_result = (dest * destfactor).Cast<int>();
|
|
|
|
switch (equation) {
|
|
case Regs::BlendEquation::Add:
|
|
result = (src_result + dst_result) / 255;
|
|
break;
|
|
|
|
case Regs::BlendEquation::Subtract:
|
|
result = (src_result - dst_result) / 255;
|
|
break;
|
|
|
|
case Regs::BlendEquation::ReverseSubtract:
|
|
result = (dst_result - src_result) / 255;
|
|
break;
|
|
|
|
// TODO: How do these two actually work?
|
|
// OpenGL doesn't include the blend factors in the min/max computations,
|
|
// but is this what the 3DS actually does?
|
|
case Regs::BlendEquation::Min:
|
|
result.r() = std::min(src.r(), dest.r());
|
|
result.g() = std::min(src.g(), dest.g());
|
|
result.b() = std::min(src.b(), dest.b());
|
|
result.a() = std::min(src.a(), dest.a());
|
|
break;
|
|
|
|
case Regs::BlendEquation::Max:
|
|
result.r() = std::max(src.r(), dest.r());
|
|
result.g() = std::max(src.g(), dest.g());
|
|
result.b() = std::max(src.b(), dest.b());
|
|
result.a() = std::max(src.a(), dest.a());
|
|
break;
|
|
|
|
default:
|
|
LOG_CRITICAL(HW_GPU, "Unknown RGB blend equation %x", equation);
|
|
UNIMPLEMENTED();
|
|
}
|
|
|
|
return Math::Vec4<u8>(MathUtil::Clamp(result.r(), 0, 255),
|
|
MathUtil::Clamp(result.g(), 0, 255),
|
|
MathUtil::Clamp(result.b(), 0, 255),
|
|
MathUtil::Clamp(result.a(), 0, 255));
|
|
};
|
|
|
|
auto srcfactor = Math::MakeVec(LookupFactorRGB(params.factor_source_rgb),
|
|
LookupFactorA(params.factor_source_a));
|
|
auto dstfactor = Math::MakeVec(LookupFactorRGB(params.factor_dest_rgb),
|
|
LookupFactorA(params.factor_dest_a));
|
|
|
|
blend_output = EvaluateBlendEquation(combiner_output, srcfactor, dest, dstfactor, params.blend_equation_rgb);
|
|
blend_output.a() = EvaluateBlendEquation(combiner_output, srcfactor, dest, dstfactor, params.blend_equation_a).a();
|
|
} else {
|
|
static auto LogicOp = [](u8 src, u8 dest, Regs::LogicOp op) -> u8 {
|
|
switch (op) {
|
|
case Regs::LogicOp::Clear:
|
|
return 0;
|
|
|
|
case Regs::LogicOp::And:
|
|
return src & dest;
|
|
|
|
case Regs::LogicOp::AndReverse:
|
|
return src & ~dest;
|
|
|
|
case Regs::LogicOp::Copy:
|
|
return src;
|
|
|
|
case Regs::LogicOp::Set:
|
|
return 255;
|
|
|
|
case Regs::LogicOp::CopyInverted:
|
|
return ~src;
|
|
|
|
case Regs::LogicOp::NoOp:
|
|
return dest;
|
|
|
|
case Regs::LogicOp::Invert:
|
|
return ~dest;
|
|
|
|
case Regs::LogicOp::Nand:
|
|
return ~(src & dest);
|
|
|
|
case Regs::LogicOp::Or:
|
|
return src | dest;
|
|
|
|
case Regs::LogicOp::Nor:
|
|
return ~(src | dest);
|
|
|
|
case Regs::LogicOp::Xor:
|
|
return src ^ dest;
|
|
|
|
case Regs::LogicOp::Equiv:
|
|
return ~(src ^ dest);
|
|
|
|
case Regs::LogicOp::AndInverted:
|
|
return ~src & dest;
|
|
|
|
case Regs::LogicOp::OrReverse:
|
|
return src | ~dest;
|
|
|
|
case Regs::LogicOp::OrInverted:
|
|
return ~src | dest;
|
|
}
|
|
};
|
|
|
|
blend_output = Math::MakeVec(
|
|
LogicOp(combiner_output.r(), dest.r(), output_merger.logic_op),
|
|
LogicOp(combiner_output.g(), dest.g(), output_merger.logic_op),
|
|
LogicOp(combiner_output.b(), dest.b(), output_merger.logic_op),
|
|
LogicOp(combiner_output.a(), dest.a(), output_merger.logic_op));
|
|
}
|
|
|
|
const Math::Vec4<u8> result = {
|
|
output_merger.red_enable ? blend_output.r() : dest.r(),
|
|
output_merger.green_enable ? blend_output.g() : dest.g(),
|
|
output_merger.blue_enable ? blend_output.b() : dest.b(),
|
|
output_merger.alpha_enable ? blend_output.a() : dest.a()
|
|
};
|
|
|
|
DrawPixel(x >> 4, y >> 4, result);
|
|
}
|
|
}
|
|
}
|
|
|
|
void ProcessTriangle(const VertexShader::OutputVertex& v0,
|
|
const VertexShader::OutputVertex& v1,
|
|
const VertexShader::OutputVertex& v2) {
|
|
ProcessTriangleInternal(v0, v1, v2);
|
|
}
|
|
|
|
} // namespace Rasterizer
|
|
|
|
} // namespace Pica
|