805 lines
34 KiB
C++
805 lines
34 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/common_types.h"
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#include "common/math_util.h"
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#include "math.h"
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#include "color.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 "debug_utils/debug_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 PAddr addr = registers.framebuffer.GetColorBufferPhysicalAddress();
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u8* color_buffer = Memory::GetPointer(PAddrToVAddr(addr));
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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 = (registers.framebuffer.height - y);
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switch (registers.framebuffer.color_format) {
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case registers.framebuffer.RGBA8:
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{
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u8* pixel = color_buffer + (x + y * registers.framebuffer.GetWidth()) * 4;
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pixel[3] = color.r();
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pixel[2] = color.g();
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pixel[1] = color.b();
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pixel[0] = color.a();
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break;
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}
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case registers.framebuffer.RGBA4:
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{
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u8* pixel = color_buffer + (x + y * registers.framebuffer.GetWidth()) * 2;
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pixel[1] = (color.r() & 0xF0) | (color.g() >> 4);
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pixel[0] = (color.b() & 0xF0) | (color.a() >> 4);
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break;
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}
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default:
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LOG_CRITICAL(Render_Software, "Unknown framebuffer color format %x", registers.framebuffer.color_format);
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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 PAddr addr = registers.framebuffer.GetColorBufferPhysicalAddress();
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u8* color_buffer = Memory::GetPointer(PAddrToVAddr(addr));
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y = (registers.framebuffer.height - y);
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switch (registers.framebuffer.color_format) {
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case registers.framebuffer.RGBA8:
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{
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Math::Vec4<u8> ret;
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u8* pixel = color_buffer + (x + y * registers.framebuffer.GetWidth()) * 4;
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ret.r() = pixel[3];
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ret.g() = pixel[2];
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ret.b() = pixel[1];
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ret.a() = pixel[0];
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return ret;
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}
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case registers.framebuffer.RGBA4:
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{
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Math::Vec4<u8> ret;
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u8* pixel = color_buffer + (x + y * registers.framebuffer.GetWidth()) * 2;
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ret.r() = Color::Convert4To8(pixel[1] >> 4);
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ret.g() = Color::Convert4To8(pixel[1] & 0x0F);
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ret.b() = Color::Convert4To8(pixel[0] >> 4);
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ret.a() = Color::Convert4To8(pixel[0] & 0x0F);
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return ret;
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}
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default:
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LOG_CRITICAL(Render_Software, "Unknown framebuffer color format %x", registers.framebuffer.color_format);
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UNIMPLEMENTED();
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}
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return {};
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}
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static u32 GetDepth(int x, int y) {
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const PAddr addr = registers.framebuffer.GetDepthBufferPhysicalAddress();
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u16* depth_buffer = reinterpret_cast<u16*>(Memory::GetPointer(PAddrToVAddr(addr)));
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y = (registers.framebuffer.height - y);
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// Assuming 16-bit depth buffer format until actual format handling is implemented
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return *(depth_buffer + x + y * registers.framebuffer.GetWidth());
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}
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static void SetDepth(int x, int y, u16 value) {
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const PAddr addr = registers.framebuffer.GetDepthBufferPhysicalAddress();
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u16* depth_buffer = reinterpret_cast<u16*>(Memory::GetPointer(PAddrToVAddr(addr)));
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y = (registers.framebuffer.height - y);
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// Assuming 16-bit depth buffer format until actual format handling is implemented
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*(depth_buffer + x + y * registers.framebuffer.GetWidth()) = value;
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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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/**
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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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// 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 (registers.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 && registers.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 = registers.GetTextures();
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auto tev_stages = registers.GetTevStages();
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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);
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val = std::min(val, (int)size - 1);
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return val;
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case Regs::TextureConfig::Repeat:
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return (int)((unsigned)val % size);
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case Regs::TextureConfig::MirroredRepeat:
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{
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int coord = (int)((unsigned)val % (2 * size));
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if (coord >= size)
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coord = 2 * size - 1 - coord;
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return coord;
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}
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default:
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LOG_ERROR(HW_GPU, "Unknown texture coordinate wrapping mode %x\n", (int)mode);
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UNIMPLEMENTED();
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return 0;
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}
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};
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// Textures are laid out from bottom to top, hence we invert the t coordinate.
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// NOTE: This may not be the right place for the inversion.
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// TODO: Check if this applies to ETC textures, too.
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s = GetWrappedTexCoord(texture.config.wrap_s, s, texture.config.width);
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t = texture.config.height - 1 - GetWrappedTexCoord(texture.config.wrap_t, t, texture.config.height);
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u8* texture_data = Memory::GetPointer(PAddrToVAddr(texture.config.GetPhysicalAddress()));
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auto info = DebugUtils::TextureInfo::FromPicaRegister(texture.config, texture.format);
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texture_color[i] = DebugUtils::LookupTexture(texture_data, s, t, info);
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DebugUtils::DumpTexture(texture.config, texture_data);
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}
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// Texture environment - consists of 6 stages of color and alpha combining.
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//
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// Color combiners take three input color values from some source (e.g. interpolated
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// vertex color, texture color, previous stage, etc), perform some very simple
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// operations on each of them (e.g. inversion) and then calculate the output color
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// with some basic arithmetic. Alpha combiners can be configured separately but work
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// analogously.
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Math::Vec4<u8> combiner_output;
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for (const auto& tev_stage : tev_stages) {
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using Source = Regs::TevStageConfig::Source;
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using ColorModifier = Regs::TevStageConfig::ColorModifier;
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using AlphaModifier = Regs::TevStageConfig::AlphaModifier;
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using Operation = Regs::TevStageConfig::Operation;
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auto GetSource = [&](Source source) -> Math::Vec4<u8> {
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switch (source) {
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// TODO: What's the difference between these two?
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case Source::PrimaryColor:
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case Source::PrimaryFragmentColor:
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return primary_color;
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case Source::Texture0:
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return texture_color[0];
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case Source::Texture1:
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return texture_color[1];
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case Source::Texture2:
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return texture_color[2];
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case Source::Constant:
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return {tev_stage.const_r, tev_stage.const_g, tev_stage.const_b, tev_stage.const_a};
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case Source::Previous:
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return combiner_output;
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default:
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LOG_ERROR(HW_GPU, "Unknown color combiner source %d\n", (int)source);
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UNIMPLEMENTED();
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return {};
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}
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};
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static auto GetColorModifier = [](ColorModifier factor, const Math::Vec4<u8>& values) -> Math::Vec3<u8> {
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switch (factor) {
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case ColorModifier::SourceColor:
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return values.rgb();
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case ColorModifier::OneMinusSourceColor:
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return (Math::Vec3<u8>(255, 255, 255) - values.rgb()).Cast<u8>();
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case ColorModifier::SourceAlpha:
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return values.aaa();
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case ColorModifier::OneMinusSourceAlpha:
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return (Math::Vec3<u8>(255, 255, 255) - values.aaa()).Cast<u8>();
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case ColorModifier::SourceRed:
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return values.rrr();
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case ColorModifier::OneMinusSourceRed:
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return (Math::Vec3<u8>(255, 255, 255) - values.rrr()).Cast<u8>();
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case ColorModifier::SourceGreen:
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return values.ggg();
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case ColorModifier::OneMinusSourceGreen:
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return (Math::Vec3<u8>(255, 255, 255) - values.ggg()).Cast<u8>();
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case ColorModifier::SourceBlue:
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return values.bbb();
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case ColorModifier::OneMinusSourceBlue:
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return (Math::Vec3<u8>(255, 255, 255) - values.bbb()).Cast<u8>();
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}
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};
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static auto GetAlphaModifier = [](AlphaModifier factor, const Math::Vec4<u8>& values) -> u8 {
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switch (factor) {
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case AlphaModifier::SourceAlpha:
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return values.a();
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case AlphaModifier::OneMinusSourceAlpha:
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return 255 - values.a();
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case AlphaModifier::SourceRed:
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return values.r();
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case AlphaModifier::OneMinusSourceRed:
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return 255 - values.r();
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case AlphaModifier::SourceGreen:
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return values.g();
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case AlphaModifier::OneMinusSourceGreen:
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return 255 - values.g();
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case AlphaModifier::SourceBlue:
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return values.b();
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case AlphaModifier::OneMinusSourceBlue:
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return 255 - values.b();
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}
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};
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static auto ColorCombine = [](Operation op, const Math::Vec3<u8> input[3]) -> Math::Vec3<u8> {
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switch (op) {
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|
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::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 {};
|
|
}
|
|
};
|
|
|
|
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::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 = Math::MakeVec(color_output, alpha_output);
|
|
}
|
|
|
|
if (registers.output_merger.alpha_test.enable) {
|
|
bool pass = false;
|
|
|
|
switch (registers.output_merger.alpha_test.func) {
|
|
case registers.output_merger.Never:
|
|
pass = false;
|
|
break;
|
|
|
|
case registers.output_merger.Always:
|
|
pass = true;
|
|
break;
|
|
|
|
case registers.output_merger.Equal:
|
|
pass = combiner_output.a() == registers.output_merger.alpha_test.ref;
|
|
break;
|
|
|
|
case registers.output_merger.NotEqual:
|
|
pass = combiner_output.a() != registers.output_merger.alpha_test.ref;
|
|
break;
|
|
|
|
case registers.output_merger.LessThan:
|
|
pass = combiner_output.a() < registers.output_merger.alpha_test.ref;
|
|
break;
|
|
|
|
case registers.output_merger.LessThanOrEqual:
|
|
pass = combiner_output.a() <= registers.output_merger.alpha_test.ref;
|
|
break;
|
|
|
|
case registers.output_merger.GreaterThan:
|
|
pass = combiner_output.a() > registers.output_merger.alpha_test.ref;
|
|
break;
|
|
|
|
case registers.output_merger.GreaterThanOrEqual:
|
|
pass = combiner_output.a() >= registers.output_merger.alpha_test.ref;
|
|
break;
|
|
}
|
|
|
|
if (!pass)
|
|
continue;
|
|
}
|
|
|
|
// TODO: Does depth indeed only get written even if depth testing is enabled?
|
|
if (registers.output_merger.depth_test_enable) {
|
|
u16 z = (u16)((v0.screenpos[2].ToFloat32() * w0 +
|
|
v1.screenpos[2].ToFloat32() * w1 +
|
|
v2.screenpos[2].ToFloat32() * w2) * 65535.f / wsum);
|
|
u16 ref_z = GetDepth(x >> 4, y >> 4);
|
|
|
|
bool pass = false;
|
|
|
|
switch (registers.output_merger.depth_test_func) {
|
|
case registers.output_merger.Never:
|
|
pass = false;
|
|
break;
|
|
|
|
case registers.output_merger.Always:
|
|
pass = true;
|
|
break;
|
|
|
|
case registers.output_merger.Equal:
|
|
pass = z == ref_z;
|
|
break;
|
|
|
|
case registers.output_merger.NotEqual:
|
|
pass = z != ref_z;
|
|
break;
|
|
|
|
case registers.output_merger.LessThan:
|
|
pass = z < ref_z;
|
|
break;
|
|
|
|
case registers.output_merger.LessThanOrEqual:
|
|
pass = z <= ref_z;
|
|
break;
|
|
|
|
case registers.output_merger.GreaterThan:
|
|
pass = z > ref_z;
|
|
break;
|
|
|
|
case registers.output_merger.GreaterThanOrEqual:
|
|
pass = z >= ref_z;
|
|
break;
|
|
}
|
|
|
|
if (!pass)
|
|
continue;
|
|
|
|
if (registers.output_merger.depth_write_enable)
|
|
SetDepth(x >> 4, y >> 4, z);
|
|
}
|
|
|
|
auto dest = GetPixel(x >> 4, y >> 4);
|
|
Math::Vec4<u8> blend_output = combiner_output;
|
|
|
|
if (registers.output_merger.alphablend_enable) {
|
|
auto params = registers.output_merger.alpha_blending;
|
|
|
|
auto LookupFactorRGB = [&](decltype(params)::BlendFactor factor) -> Math::Vec3<u8> {
|
|
switch (factor) {
|
|
case params.Zero:
|
|
return Math::Vec3<u8>(0, 0, 0);
|
|
|
|
case params.One:
|
|
return Math::Vec3<u8>(255, 255, 255);
|
|
|
|
case params.SourceColor:
|
|
return combiner_output.rgb();
|
|
|
|
case params.OneMinusSourceColor:
|
|
return Math::Vec3<u8>(255 - combiner_output.r(), 255 - combiner_output.g(), 255 - combiner_output.b());
|
|
|
|
case params.DestColor:
|
|
return dest.rgb();
|
|
|
|
case params.OneMinusDestColor:
|
|
return Math::Vec3<u8>(255 - dest.r(), 255 - dest.g(), 255 - dest.b());
|
|
|
|
case params.SourceAlpha:
|
|
return Math::Vec3<u8>(combiner_output.a(), combiner_output.a(), combiner_output.a());
|
|
|
|
case params.OneMinusSourceAlpha:
|
|
return Math::Vec3<u8>(255 - combiner_output.a(), 255 - combiner_output.a(), 255 - combiner_output.a());
|
|
|
|
case params.DestAlpha:
|
|
return Math::Vec3<u8>(dest.a(), dest.a(), dest.a());
|
|
|
|
case params.OneMinusDestAlpha:
|
|
return Math::Vec3<u8>(255 - dest.a(), 255 - dest.a(), 255 - dest.a());
|
|
|
|
case params.ConstantColor:
|
|
return Math::Vec3<u8>(registers.output_merger.blend_const.r, registers.output_merger.blend_const.g, registers.output_merger.blend_const.b);
|
|
|
|
case params.OneMinusConstantColor:
|
|
return Math::Vec3<u8>(255 - registers.output_merger.blend_const.r, 255 - registers.output_merger.blend_const.g, 255 - registers.output_merger.blend_const.b);
|
|
|
|
case params.ConstantAlpha:
|
|
return Math::Vec3<u8>(registers.output_merger.blend_const.a, registers.output_merger.blend_const.a, registers.output_merger.blend_const.a);
|
|
|
|
case params.OneMinusConstantAlpha:
|
|
return Math::Vec3<u8>(255 - registers.output_merger.blend_const.a, 255 - registers.output_merger.blend_const.a, 255 - registers.output_merger.blend_const.a);
|
|
|
|
default:
|
|
LOG_CRITICAL(HW_GPU, "Unknown color blend factor %x", factor);
|
|
UNIMPLEMENTED();
|
|
break;
|
|
}
|
|
};
|
|
|
|
auto LookupFactorA = [&](decltype(params)::BlendFactor factor) -> u8 {
|
|
switch (factor) {
|
|
case params.Zero:
|
|
return 0;
|
|
|
|
case params.One:
|
|
return 255;
|
|
|
|
case params.SourceAlpha:
|
|
return combiner_output.a();
|
|
|
|
case params.OneMinusSourceAlpha:
|
|
return 255 - combiner_output.a();
|
|
|
|
case params.DestAlpha:
|
|
return dest.a();
|
|
|
|
case params.OneMinusDestAlpha:
|
|
return 255 - dest.a();
|
|
|
|
case params.ConstantAlpha:
|
|
return registers.output_merger.blend_const.a;
|
|
|
|
case params.OneMinusConstantAlpha:
|
|
return 255 - registers.output_merger.blend_const.a;
|
|
|
|
default:
|
|
LOG_CRITICAL(HW_GPU, "Unknown alpha blend factor %x", factor);
|
|
UNIMPLEMENTED();
|
|
break;
|
|
}
|
|
};
|
|
|
|
using BlendEquation = decltype(params)::BlendEquation;
|
|
static auto EvaluateBlendEquation = [](const Math::Vec4<u8>& src, const Math::Vec4<u8>& srcfactor,
|
|
const Math::Vec4<u8>& dest, const Math::Vec4<u8>& destfactor,
|
|
BlendEquation equation) {
|
|
Math::Vec4<int> result;
|
|
|
|
auto src_result = (src * srcfactor).Cast<int>();
|
|
auto dst_result = (dest * destfactor).Cast<int>();
|
|
|
|
switch (equation) {
|
|
case BlendEquation::Add:
|
|
result = (src_result + dst_result) / 255;
|
|
break;
|
|
|
|
case BlendEquation::Subtract:
|
|
result = (src_result - dst_result) / 255;
|
|
break;
|
|
|
|
case 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 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 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 {
|
|
LOG_CRITICAL(HW_GPU, "logic op: %x", registers.output_merger.logic_op);
|
|
UNIMPLEMENTED();
|
|
}
|
|
|
|
const Math::Vec4<u8> result = {
|
|
registers.output_merger.red_enable ? blend_output.r() : dest.r(),
|
|
registers.output_merger.green_enable ? blend_output.g() : dest.g(),
|
|
registers.output_merger.blue_enable ? blend_output.b() : dest.b(),
|
|
registers.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
|