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@ -5,6 +5,7 @@ |
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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 "pica.h"
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@ -20,16 +21,31 @@ 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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u32* color_buffer = reinterpret_cast<u32*>(Memory::GetPointer(PAddrToVAddr(addr))); |
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u32 value = (color.a() << 24) | (color.r() << 16) | (color.g() << 8) | color.b(); |
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// Assuming RGBA8 format until actual framebuffer format handling is implemented
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*(color_buffer + x + y * registers.framebuffer.GetWidth()) = value; |
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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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u32 value = (color.a() << 24) | (color.r() << 16) | (color.g() << 8) | color.b(); |
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*(color_buffer + x + y * registers.framebuffer.GetWidth()) = value; |
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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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u32* color_buffer_u32 = reinterpret_cast<u32*>(Memory::GetPointer(PAddrToVAddr(addr))); |
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y = (registers.framebuffer.height - y); |
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u32 value = *(color_buffer_u32 + x + y * registers.framebuffer.GetWidth()); |
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Math::Vec4<u8> ret; |
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ret.a() = value >> 24; |
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@ -43,6 +59,8 @@ 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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@ -51,6 +69,8 @@ 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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@ -90,30 +110,43 @@ static int SignedArea (const Math::Vec2<Fix12P4>& vtx1, |
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return Math::Cross(vec1, vec2).z; |
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}; |
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void ProcessTriangle(const VertexShader::OutputVertex& v0, |
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const VertexShader::OutputVertex& v1, |
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const VertexShader::OutputVertex& v2) |
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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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auto FloatToFix = [](float24 flt) { |
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return Fix12P4(static_cast<unsigned short>(flt.ToFloat32() * 16.0f)); |
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}; |
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auto ScreenToRasterizerCoordinates = [FloatToFix](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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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::KeepClockWise) { |
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// Reverse vertex order and use the CCW code path.
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std::swap(vtxpos[1], vtxpos[2]); |
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} |
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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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if (registers.cull_mode != Regs::CullMode::KeepAll) { |
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// Cull away triangles which are wound clockwise.
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// TODO: A check for degenerate triangles ("== 0") should be considered for CullMode::KeepAll
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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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@ -155,9 +188,10 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0, |
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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; y < max_y; y += 0x10) { |
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for (u16 x = min_x; x < max_x; x += 0x10) { |
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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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@ -220,7 +254,7 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0, |
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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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auto GetWrappedTexCoord = [](Regs::TextureConfig::WrapMode mode, int val, unsigned size) { |
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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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@ -228,7 +262,15 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0, |
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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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return (int)((unsigned)val % size); |
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case Regs::TextureConfig::MirroredRepeat: |
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{ |
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int val = (int)((unsigned)val % (2 * size)); |
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if (val >= size) |
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val = 2 * size - 1 - val; |
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return val; |
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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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@ -236,6 +278,10 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0, |
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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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@ -262,7 +308,9 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0, |
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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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@ -378,6 +426,25 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0, |
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return result.Cast<u8>(); |
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} |
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case Operation::MultiplyThenAdd: |
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{ |
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auto result = (input[0] * input[1] + 255 * input[2].Cast<int>()) / 255; |
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result.r() = std::min(255, result.r()); |
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result.g() = std::min(255, result.g()); |
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result.b() = std::min(255, result.b()); |
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return result.Cast<u8>(); |
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} |
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case Operation::AddThenMultiply: |
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{ |
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auto result = input[0] + input[1]; |
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result.r() = std::min(255, result.r()); |
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result.g() = std::min(255, result.g()); |
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result.b() = std::min(255, result.b()); |
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result = (result * input[2].Cast<int>()) / 255; |
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return result.Cast<u8>(); |
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} |
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default: |
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LOG_ERROR(HW_GPU, "Unknown color combiner operation %d\n", (int)op); |
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UNIMPLEMENTED(); |
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@ -402,6 +469,12 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0, |
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case Operation::Subtract: |
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return std::max(0, (int)input[0] - (int)input[1]); |
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case Operation::MultiplyThenAdd: |
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return std::min(255, (input[0] * input[1] + 255 * input[2]) / 255); |
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case Operation::AddThenMultiply: |
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return (std::min(255, (input[0] + input[1])) * input[2]) / 255; |
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default: |
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LOG_ERROR(HW_GPU, "Unknown alpha combiner operation %d\n", (int)op); |
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UNIMPLEMENTED(); |
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@ -475,7 +548,7 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0, |
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// TODO: Does depth indeed only get written even if depth testing is enabled?
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if (registers.output_merger.depth_test_enable) { |
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u16 z = (u16)(-(v0.screenpos[2].ToFloat32() * w0 + |
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u16 z = (u16)((v0.screenpos[2].ToFloat32() * w0 + |
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v1.screenpos[2].ToFloat32() * w1 + |
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v2.screenpos[2].ToFloat32() * w2) * 65535.f / wsum); |
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u16 ref_z = GetDepth(x >> 4, y >> 4); |
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@ -524,6 +597,7 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0, |
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} |
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auto dest = GetPixel(x >> 4, y >> 4); |
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Math::Vec4<u8> blend_output = combiner_output; |
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if (registers.output_merger.alphablend_enable) { |
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auto params = registers.output_merger.alpha_blending; |
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@ -574,7 +648,7 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0, |
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default: |
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LOG_CRITICAL(HW_GPU, "Unknown color blend factor %x", factor); |
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exit(0); |
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UNIMPLEMENTED(); |
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break; |
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} |
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}; |
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@ -607,86 +681,78 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0, |
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default: |
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LOG_CRITICAL(HW_GPU, "Unknown alpha blend factor %x", factor); |
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exit(0); |
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UNIMPLEMENTED(); |
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break; |
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} |
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}; |
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using BlendEquation = decltype(params)::BlendEquation; |
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static auto EvaluateBlendEquation = [](const Math::Vec4<u8>& src, const Math::Vec4<u8>& srcfactor, |
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const Math::Vec4<u8>& dest, const Math::Vec4<u8>& destfactor, |
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BlendEquation equation) { |
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Math::Vec4<int> result; |
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auto src_result = (src * srcfactor).Cast<int>(); |
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auto dst_result = (dest * destfactor).Cast<int>(); |
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switch (equation) { |
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case BlendEquation::Add: |
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result = (src_result + dst_result) / 255; |
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break; |
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case BlendEquation::Subtract: |
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result = (src_result - dst_result) / 255; |
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break; |
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case BlendEquation::ReverseSubtract: |
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result = (dst_result - src_result) / 255; |
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break; |
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// TODO: How do these two actually work?
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// OpenGL doesn't include the blend factors in the min/max computations,
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// but is this what the 3DS actually does?
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case BlendEquation::Min: |
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result.r() = std::min(src.r(), dest.r()); |
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result.g() = std::min(src.g(), dest.g()); |
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result.b() = std::min(src.b(), dest.b()); |
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result.a() = std::min(src.a(), dest.a()); |
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break; |
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case BlendEquation::Max: |
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result.r() = std::max(src.r(), dest.r()); |
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result.g() = std::max(src.g(), dest.g()); |
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result.b() = std::max(src.b(), dest.b()); |
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result.a() = std::max(src.a(), dest.a()); |
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break; |
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default: |
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LOG_CRITICAL(HW_GPU, "Unknown RGB blend equation %x", equation); |
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UNIMPLEMENTED(); |
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} |
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return Math::Vec4<u8>(MathUtil::Clamp(result.r(), 0, 255), |
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MathUtil::Clamp(result.g(), 0, 255), |
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MathUtil::Clamp(result.b(), 0, 255), |
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MathUtil::Clamp(result.a(), 0, 255)); |
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}; |
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auto srcfactor = Math::MakeVec(LookupFactorRGB(params.factor_source_rgb), |
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LookupFactorA(params.factor_source_a)); |
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auto dstfactor = Math::MakeVec(LookupFactorRGB(params.factor_dest_rgb), |
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LookupFactorA(params.factor_dest_a)); |
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auto src_result = (combiner_output * srcfactor).Cast<int>(); |
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auto dst_result = (dest * dstfactor).Cast<int>(); |
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switch (params.blend_equation_rgb) { |
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case params.Add: |
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{ |
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auto result = (src_result + dst_result) / 255; |
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result.r() = std::min(255, result.r()); |
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result.g() = std::min(255, result.g()); |
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result.b() = std::min(255, result.b()); |
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combiner_output = result.Cast<u8>(); |
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break; |
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} |
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case params.Subtract: |
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{ |
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auto result = (src_result - dst_result) / 255; |
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result.r() = std::max(0, result.r()); |
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result.g() = std::max(0, result.g()); |
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result.b() = std::max(0, result.b()); |
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combiner_output = result.Cast<u8>(); |
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break; |
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} |
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case params.ReverseSubtract: |
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{ |
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auto result = (dst_result - src_result) / 255; |
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result.r() = std::max(0, result.r()); |
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result.g() = std::max(0, result.g()); |
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result.b() = std::max(0, result.b()); |
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combiner_output = result.Cast<u8>(); |
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break; |
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} |
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case params.Min: |
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{ |
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// TODO: GL spec says to do it without the factors, but is this what the 3DS does?
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Math::Vec4<int> result; |
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result.r() = std::min(combiner_output.r(),dest.r()); |
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result.g() = std::min(combiner_output.g(),dest.g()); |
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result.b() = std::min(combiner_output.b(),dest.b()); |
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combiner_output = result.Cast<u8>(); |
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break; |
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} |
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case params.Max: |
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{ |
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// TODO: GL spec says to do it without the factors, but is this what the 3DS does?
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Math::Vec4<int> result; |
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result.r() = std::max(combiner_output.r(),dest.r()); |
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result.g() = std::max(combiner_output.g(),dest.g()); |
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result.b() = std::max(combiner_output.b(),dest.b()); |
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combiner_output = result.Cast<u8>(); |
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break; |
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} |
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default: |
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LOG_CRITICAL(HW_GPU, "Unknown RGB blend equation %x", params.blend_equation_rgb.Value()); |
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exit(0); |
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} |
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blend_output = EvaluateBlendEquation(combiner_output, srcfactor, dest, dstfactor, params.blend_equation_rgb); |
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blend_output.a() = EvaluateBlendEquation(combiner_output, srcfactor, dest, dstfactor, params.blend_equation_a).a(); |
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} else { |
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LOG_CRITICAL(HW_GPU, "logic op: %x", registers.output_merger.logic_op); |
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exit(0); |
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UNIMPLEMENTED(); |
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} |
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const Math::Vec4<u8> result = { |
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registers.output_merger.red_enable ? combiner_output.r() : dest.r(), |
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registers.output_merger.green_enable ? combiner_output.g() : dest.g(), |
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registers.output_merger.blue_enable ? combiner_output.b() : dest.b(), |
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registers.output_merger.alpha_enable ? combiner_output.a() : dest.a() |
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registers.output_merger.red_enable ? blend_output.r() : dest.r(), |
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registers.output_merger.green_enable ? blend_output.g() : dest.g(), |
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registers.output_merger.blue_enable ? blend_output.b() : dest.b(), |
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registers.output_merger.alpha_enable ? blend_output.a() : dest.a() |
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}; |
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DrawPixel(x >> 4, y >> 4, result); |
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@ -694,6 +760,12 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0, |
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} |
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} |
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void ProcessTriangle(const VertexShader::OutputVertex& v0, |
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const VertexShader::OutputVertex& v1, |
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const VertexShader::OutputVertex& v2) { |
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ProcessTriangleInternal(v0, v1, v2); |
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} |
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} // namespace Rasterizer
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} // namespace Pica
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bunnei
11 years ago