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Rasterizer: Use Fix12P4 (rasterizer coordinates) and make it signed

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This commit is contained in:
Jannik Vogel 2016-04-06 03:14:13 +02:00
parent d895bc1543
commit 9d334f3cf3
1 changed files with 67 additions and 23 deletions
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90
src/video_core/rasterizer.cpp
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@ -260,21 +260,60 @@ static u8 PerformStencilAction(Regs::StencilAction action, u8 old_stencil, u8 re
// NOTE: Assuming that rasterizer coordinates are 12.4 fixed-point values
struct Fix12P4 {
Fix12P4() {}
Fix12P4(u16 val) : val(val) {}
static Fix12P4 FromRaw(s16 val) {
Fix12P4 res;
res.val = val;
return res;
}
static Fix12P4 FromInt(s16 intVal, u16 fracVal = 0) {
return FromRaw(static_cast<s16>(((intVal * 16) & IntMask()) | (fracVal & FracMask())));
}
static Fix12P4 FromFloat(float fltVal) {
return FromRaw(static_cast<s16>(round(fltVal * 16.0f)));
}
static Fix12P4 Zero() {
return FromRaw(0);
}
static u16 FracMask() { return 0xF; }
static u16 IntMask() { return (u16)~0xF; }
operator u16() const {
s16 Int() const {
return static_cast<s16>((val & IntMask()) / 16);
}
u16 Frac() const {
return static_cast<u16>(val & FracMask());
}
operator s16() const {
return val;
}
bool operator < (const Fix12P4& oth) const {
return (u16)*this < (u16)oth;
return (s16)*this < (s16)oth;
}
Fix12P4 operator + (const Fix12P4& oth) const {
return FromRaw(val + oth.val);
}
Fix12P4 operator / (const Fix12P4& oth) const {
return FromRaw(static_cast<s16>((int)val * 16 / (int)oth.val));
}
Fix12P4& operator += (const Fix12P4& oth) {
val += oth.val;
return *this;
}
private:
u16 val;
s16 val;
};
/**
@ -308,9 +347,9 @@ static void ProcessTriangleInternal(const Shader::OutputVertex& v0,
// vertex positions in rasterizer coordinates
static auto FloatToFix = [](float24 flt) {
// TODO: Rounding here is necessary to prevent garbage pixels at
// TODO: Rounding in Fix12P4::FromFloat is necessary to prevent garbage pixels at
// triangle borders. Is it that the correct solution, though?
return Fix12P4(static_cast<unsigned short>(round(flt.ToFloat32() * 16.0f)));
return Fix12P4::FromFloat(flt.ToFloat32());
};
static auto ScreenToRasterizerCoordinates = [](const Math::Vec3<float24>& vec) {
return Math::Vec3<Fix12P4>{FloatToFix(vec.x), FloatToFix(vec.y), FloatToFix(vec.z)};
@ -338,16 +377,19 @@ static void ProcessTriangleInternal(const Shader::OutputVertex& v0,
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});
u16 max_x = std::max({vtxpos[0].x, vtxpos[1].x, vtxpos[2].x});
u16 max_y = std::max({vtxpos[0].y, vtxpos[1].y, vtxpos[2].y});
// Get bounding box for triangle
Fix12P4 min_x = std::min({vtxpos[0].x, vtxpos[1].x, vtxpos[2].x});
Fix12P4 min_y = std::min({vtxpos[0].y, vtxpos[1].y, vtxpos[2].y});
Fix12P4 max_x = std::max({vtxpos[0].x, vtxpos[1].x, vtxpos[2].x});
Fix12P4 max_y = std::max({vtxpos[0].y, vtxpos[1].y, vtxpos[2].y});
min_x &= Fix12P4::IntMask();
min_y &= Fix12P4::IntMask();
max_x = ((max_x + Fix12P4::FracMask()) & Fix12P4::IntMask());
max_y = ((max_y + Fix12P4::FracMask()) & Fix12P4::IntMask());
// TODO: Proper scissor rect test!
Fix12P4 frac = Fix12P4::FromInt(0, Fix12P4::FracMask());
min_x = Fix12P4::FromInt(min_x.Int(), 0);
min_y = Fix12P4::FromInt(min_y.Int(), 0);
max_x = Fix12P4::FromInt((max_x + frac).Int());
max_y = Fix12P4::FromInt((max_y + frac).Int());
// Triangle filling rules: Pixels on the right-sided edge or on flat bottom edges are not
// drawn. Pixels on any other triangle border are drawn. This is implemented with three bias
@ -380,8 +422,10 @@ static void ProcessTriangleInternal(const Shader::OutputVertex& v0,
// Enter rasterization loop, starting at the center of the topleft bounding box corner.
// TODO: Not sure if looping through x first might be faster
for (u16 y = min_y + 8; y < max_y; y += 0x10) {
for (u16 x = min_x + 8; x < max_x; x += 0x10) {
Fix12P4 pixel = Fix12P4::FromInt(1);
Fix12P4 half_pixel = pixel / Fix12P4::FromInt(2);
for (Fix12P4 y = min_y + half_pixel; y < max_y; y += pixel) {
for (Fix12P4 x = min_x + half_pixel; x < max_x; x += pixel) {
// Calculate the barycentric coordinates w0, w1 and w2
int w0 = bias0 + SignedArea(vtxpos[1].xy(), vtxpos[2].xy(), {x, y});
@ -838,11 +882,11 @@ static void ProcessTriangleInternal(const Shader::OutputVertex& v0,
auto UpdateStencil = [stencil_test, x, y, &old_stencil](Pica::Regs::StencilAction action) {
u8 new_stencil = PerformStencilAction(action, old_stencil, stencil_test.reference_value);
if (g_state.regs.framebuffer.allow_depth_stencil_write != 0)
SetStencil(x >> 4, y >> 4, (new_stencil & stencil_test.write_mask) | (old_stencil & ~stencil_test.write_mask));
SetStencil(x.Int(), y.Int(), (new_stencil & stencil_test.write_mask) | (old_stencil & ~stencil_test.write_mask));
};
if (stencil_action_enable) {
old_stencil = GetStencil(x >> 4, y >> 4);
old_stencil = GetStencil(x.Int(), y.Int());
u8 dest = old_stencil & stencil_test.input_mask;
u8 ref = stencil_test.reference_value & stencil_test.input_mask;
@ -913,7 +957,7 @@ static void ProcessTriangleInternal(const Shader::OutputVertex& v0,
u32 z = (u32)(depth * ((1 << num_bits) - 1));
if (output_merger.depth_test_enable) {
u32 ref_z = GetDepth(x >> 4, y >> 4);
u32 ref_z = GetDepth(x.Int(), y.Int());
bool pass = false;
@ -959,13 +1003,13 @@ static void ProcessTriangleInternal(const Shader::OutputVertex& v0,
}
if (regs.framebuffer.allow_depth_stencil_write != 0 && output_merger.depth_write_enable)
SetDepth(x >> 4, y >> 4, z);
SetDepth(x.Int(), y.Int(), z);
// The stencil depth_pass action is executed even if depth testing is disabled
if (stencil_action_enable)
UpdateStencil(stencil_test.action_depth_pass);
auto dest = GetPixel(x >> 4, y >> 4);
auto dest = GetPixel(x.Int(), y.Int());
Math::Vec4<u8> blend_output = combiner_output;
if (output_merger.alphablend_enable) {
@ -1168,7 +1212,7 @@ static void ProcessTriangleInternal(const Shader::OutputVertex& v0,
};
if (regs.framebuffer.allow_color_write != 0)
DrawPixel(x >> 4, y >> 4, result);
DrawPixel(x.Int(), y.Int(), result);
}
}
}