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-rw-r--r--src/video_core/rasterizer.cpp241
1 files changed, 195 insertions, 46 deletions
diff --git a/src/video_core/rasterizer.cpp b/src/video_core/rasterizer.cpp
index a80148872..025d4e484 100644
--- a/src/video_core/rasterizer.cpp
+++ b/src/video_core/rasterizer.cpp
@@ -18,51 +18,82 @@ namespace Pica {
namespace Rasterizer {
static void DrawPixel(int x, int y, const Math::Vec4<u8>& color) {
- u32* color_buffer = reinterpret_cast<u32*>(Memory::GetPointer(PAddrToVAddr(registers.framebuffer.GetColorBufferPhysicalAddress())));
+ const PAddr addr = registers.framebuffer.GetColorBufferPhysicalAddress();
+ u32* color_buffer = reinterpret_cast<u32*>(Memory::GetPointer(PAddrToVAddr(addr)));
u32 value = (color.a() << 24) | (color.r() << 16) | (color.g() << 8) | color.b();
// Assuming RGBA8 format until actual framebuffer format handling is implemented
*(color_buffer + x + y * registers.framebuffer.GetWidth()) = value;
}
+static const Math::Vec4<u8> GetPixel(int x, int y) {
+ const PAddr addr = registers.framebuffer.GetColorBufferPhysicalAddress();
+ u32* color_buffer_u32 = reinterpret_cast<u32*>(Memory::GetPointer(PAddrToVAddr(addr)));
+
+ u32 value = *(color_buffer_u32 + x + y * registers.framebuffer.GetWidth());
+ Math::Vec4<u8> ret;
+ ret.a() = value >> 24;
+ ret.r() = (value >> 16) & 0xFF;
+ ret.g() = (value >> 8) & 0xFF;
+ ret.b() = value & 0xFF;
+ return ret;
+ }
+
static u32 GetDepth(int x, int y) {
- u16* depth_buffer = reinterpret_cast<u16*>(Memory::GetPointer(PAddrToVAddr(registers.framebuffer.GetDepthBufferPhysicalAddress())));
+ const PAddr addr = registers.framebuffer.GetDepthBufferPhysicalAddress();
+ u16* depth_buffer = reinterpret_cast<u16*>(Memory::GetPointer(PAddrToVAddr(addr)));
// Assuming 16-bit depth buffer format until actual format handling is implemented
return *(depth_buffer + x + y * registers.framebuffer.GetWidth());
}
static void SetDepth(int x, int y, u16 value) {
- u16* depth_buffer = reinterpret_cast<u16*>(Memory::GetPointer(PAddrToVAddr(registers.framebuffer.GetDepthBufferPhysicalAddress())));
+ const PAddr addr = registers.framebuffer.GetDepthBufferPhysicalAddress();
+ u16* depth_buffer = reinterpret_cast<u16*>(Memory::GetPointer(PAddrToVAddr(addr)));
// Assuming 16-bit depth buffer format until actual format handling is implemented
*(depth_buffer + x + y * registers.framebuffer.GetWidth()) = value;
}
-void ProcessTriangle(const VertexShader::OutputVertex& v0,
- const VertexShader::OutputVertex& v1,
- const VertexShader::OutputVertex& v2)
-{
- // NOTE: Assuming that rasterizer coordinates are 12.4 fixed-point values
- struct Fix12P4 {
- Fix12P4() {}
- Fix12P4(u16 val) : val(val) {}
+// NOTE: Assuming that rasterizer coordinates are 12.4 fixed-point values
+struct Fix12P4 {
+ Fix12P4() {}
+ Fix12P4(u16 val) : val(val) {}
- static u16 FracMask() { return 0xF; }
- static u16 IntMask() { return (u16)~0xF; }
+ static u16 FracMask() { return 0xF; }
+ static u16 IntMask() { return (u16)~0xF; }
- operator u16() const {
- return val;
- }
+ operator u16() const {
+ return val;
+ }
- bool operator < (const Fix12P4& oth) const {
- return (u16)*this < (u16)oth;
- }
+ bool operator < (const Fix12P4& oth) const {
+ return (u16)*this < (u16)oth;
+ }
- private:
- u16 val;
- };
+private:
+ u16 val;
+};
+
+/**
+ * Calculate signed area of the triangle spanned by the three argument vertices.
+ * The sign denotes an orientation.
+ *
+ * @todo define orientation concretely.
+ */
+static int SignedArea (const Math::Vec2<Fix12P4>& vtx1,
+ const Math::Vec2<Fix12P4>& vtx2,
+ const Math::Vec2<Fix12P4>& vtx3) {
+ const auto vec1 = Math::MakeVec(vtx2 - vtx1, 0);
+ const auto vec2 = Math::MakeVec(vtx3 - vtx1, 0);
+ // TODO: There is a very small chance this will overflow for sizeof(int) == 4
+ return Math::Cross(vec1, vec2).z;
+};
+void ProcessTriangle(const VertexShader::OutputVertex& v0,
+ const VertexShader::OutputVertex& v1,
+ const VertexShader::OutputVertex& v2)
+{
// vertex positions in rasterizer coordinates
auto FloatToFix = [](float24 flt) {
return Fix12P4(static_cast<unsigned short>(flt.ToFloat32() * 16.0f));
@@ -70,10 +101,23 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0,
auto ScreenToRasterizerCoordinates = [FloatToFix](const Math::Vec3<float24> vec) {
return Math::Vec3<Fix12P4>{FloatToFix(vec.x), FloatToFix(vec.y), FloatToFix(vec.z)};
};
+
Math::Vec3<Fix12P4> vtxpos[3]{ ScreenToRasterizerCoordinates(v0.screenpos),
ScreenToRasterizerCoordinates(v1.screenpos),
ScreenToRasterizerCoordinates(v2.screenpos) };
+ if (registers.cull_mode == Regs::CullMode::KeepClockWise) {
+ // Reverse vertex order and use the CCW code path.
+ std::swap(vtxpos[1], vtxpos[2]);
+ }
+
+ if (registers.cull_mode != Regs::CullMode::KeepAll) {
+ // Cull away triangles which are wound clockwise.
+ // TODO: A check for degenerate triangles ("== 0") should be considered for CullMode::KeepAll
+ if (SignedArea(vtxpos[0].xy(), vtxpos[1].xy(), vtxpos[2].xy()) <= 0)
+ return;
+ }
+
// TODO: Proper scissor rect test!
u16 min_x = std::min({vtxpos[0].x, vtxpos[1].x, vtxpos[2].x});
u16 min_y = std::min({vtxpos[0].y, vtxpos[1].y, vtxpos[2].y});
@@ -116,18 +160,9 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0,
for (u16 x = min_x; x < max_x; x += 0x10) {
// Calculate the barycentric coordinates w0, w1 and w2
- auto orient2d = [](const Math::Vec2<Fix12P4>& vtx1,
- const Math::Vec2<Fix12P4>& vtx2,
- const Math::Vec2<Fix12P4>& vtx3) {
- const auto vec1 = Math::MakeVec(vtx2 - vtx1, 0);
- const auto vec2 = Math::MakeVec(vtx3 - vtx1, 0);
- // TODO: There is a very small chance this will overflow for sizeof(int) == 4
- return Math::Cross(vec1, vec2).z;
- };
-
- int w0 = bias0 + orient2d(vtxpos[1].xy(), vtxpos[2].xy(), {x, y});
- int w1 = bias1 + orient2d(vtxpos[2].xy(), vtxpos[0].xy(), {x, y});
- int w2 = bias2 + orient2d(vtxpos[0].xy(), vtxpos[1].xy(), {x, y});
+ int w0 = bias0 + SignedArea(vtxpos[1].xy(), vtxpos[2].xy(), {x, y});
+ int w1 = bias1 + SignedArea(vtxpos[2].xy(), vtxpos[0].xy(), {x, y});
+ int w2 = bias2 + SignedArea(vtxpos[0].xy(), vtxpos[1].xy(), {x, y});
int wsum = w0 + w1 + w2;
// If current pixel is not covered by the current primitive
@@ -201,8 +236,8 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0,
return 0;
}
};
- s = GetWrappedTexCoord(registers.texture0.wrap_s, s, registers.texture0.width);
- t = GetWrappedTexCoord(registers.texture0.wrap_t, t, registers.texture0.height);
+ 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::GetPointer(PAddrToVAddr(texture.config.GetPhysicalAddress()));
auto info = DebugUtils::TextureInfo::FromPicaRegister(texture.config, texture.format);
@@ -279,12 +314,15 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0,
}
};
- auto GetColorModifier = [](ColorModifier factor, const Math::Vec4<u8>& values) -> Math::Vec3<u8> {
+ 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.a(), values.a(), values.a() };
@@ -295,7 +333,7 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0,
}
};
- auto GetAlphaModifier = [](AlphaModifier factor, u8 value) -> u8 {
+ static auto GetAlphaModifier = [](AlphaModifier factor, u8 value) -> u8 {
switch (factor) {
case AlphaModifier::SourceAlpha:
return value;
@@ -310,7 +348,7 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0,
}
};
- auto ColorCombine = [](Operation op, const Math::Vec3<u8> input[3]) -> Math::Vec3<u8> {
+ static auto ColorCombine = [](Operation op, const Math::Vec3<u8> input[3]) -> Math::Vec3<u8> {
switch (op) {
case Operation::Replace:
return input[0];
@@ -330,6 +368,15 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0,
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>();
+ }
+
default:
LOG_ERROR(HW_GPU, "Unknown color combiner operation %d\n", (int)op);
_dbg_assert_(HW_GPU, 0);
@@ -337,7 +384,7 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0,
}
};
- auto AlphaCombine = [](Operation op, const std::array<u8,3>& input) -> u8 {
+ static auto AlphaCombine = [](Operation op, const std::array<u8,3>& input) -> u8 {
switch (op) {
case Operation::Replace:
return input[0];
@@ -351,6 +398,9 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0,
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]);
+
default:
LOG_ERROR(HW_GPU, "Unknown alpha combiner operation %d\n", (int)op);
_dbg_assert_(HW_GPU, 0);
@@ -381,12 +431,111 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0,
combiner_output = Math::MakeVec(color_output, alpha_output);
}
- // TODO: Not sure if the multiplication by 65535 has already been taken care
- // of when transforming to screen coordinates or not.
- u16 z = (u16)(((float)v0.screenpos[2].ToFloat32() * w0 +
- (float)v1.screenpos[2].ToFloat32() * w1 +
- (float)v2.screenpos[2].ToFloat32() * w2) * 65535.f / wsum);
- SetDepth(x >> 4, y >> 4, z);
+ // 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.Always:
+ pass = true;
+ break;
+
+ case registers.output_merger.LessThan:
+ pass = z < ref_z;
+ break;
+
+ case registers.output_merger.GreaterThan:
+ pass = z > ref_z;
+ break;
+
+ default:
+ LOG_ERROR(HW_GPU, "Unknown depth test function %x", registers.output_merger.depth_test_func.Value());
+ break;
+ }
+
+ if (!pass)
+ continue;
+
+ if (registers.output_merger.depth_write_enable)
+ SetDepth(x >> 4, y >> 4, z);
+ }
+
+ auto dest = GetPixel(x >> 4, y >> 4);
+
+ 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.SourceAlpha:
+ return Math::MakeVec(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());
+
+ default:
+ LOG_CRITICAL(HW_GPU, "Unknown color blend factor %x", factor);
+ exit(0);
+ 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();
+
+ default:
+ LOG_CRITICAL(HW_GPU, "Unknown alpha blend factor %x", factor);
+ exit(0);
+ break;
+ }
+ };
+
+ 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));
+
+ switch (params.blend_equation_rgb) {
+ case params.Add:
+ {
+ auto result = (combiner_output * srcfactor + dest * dstfactor) / 255;
+ result.r() = std::min(255, result.r());
+ result.g() = std::min(255, result.g());
+ result.b() = std::min(255, result.b());
+ combiner_output = result.Cast<u8>();
+ break;
+ }
+
+ default:
+ LOG_CRITICAL(HW_GPU, "Unknown RGB blend equation %x", params.blend_equation_rgb.Value());
+ exit(0);
+ }
+ } else {
+ LOG_CRITICAL(HW_GPU, "logic op: %x", registers.output_merger.logic_op);
+ exit(0);
+ }
DrawPixel(x >> 4, y >> 4, combiner_output);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-02 17:12:31 +0100