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PICA: Implement scissor test

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Subv 2015-12-02 13:23:51 -05:00 • committed by Yuri Kunde Schlesner
parent 9cde5cbbd3
commit f9be06b15f
5 changed files with 105 additions and 3 deletions
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22
src/video_core/rasterizer.cpp
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@ -338,12 +338,25 @@ 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});
// Convert the scissor box coordinates to 12.4 fixed point
u16 scissor_left = (u16)(regs.scissor_test.GetLeft() << 4);
u16 scissor_top = (u16)(regs.scissor_test.GetTop() << 4);
u16 scissor_right = (u16)(regs.scissor_test.right << 4);
u16 scissor_bottom = (u16)(regs.scissor_test.bottom << 4);
if (regs.scissor_test.mode == Regs::ScissorMode::Include) {
// Calculate the new bounds
min_x = std::max(min_x, scissor_right);
min_y = std::max(min_y, scissor_bottom);
max_x = std::min(max_x, scissor_left);
max_y = std::min(max_y, scissor_top);
}
min_x &= Fix12P4::IntMask();
min_y &= Fix12P4::IntMask();
max_x = ((max_x + Fix12P4::FracMask()) & Fix12P4::IntMask());
@ -383,6 +396,13 @@ static void ProcessTriangleInternal(const Shader::OutputVertex& v0,
for (u16 y = min_y + 8; y < max_y; y += 0x10) {
for (u16 x = min_x + 8; x < max_x; x += 0x10) {
// Do not process the pixel if it's inside the scissor box and the scissor mode is set to Exclude
if (regs.scissor_test.mode == Regs::ScissorMode::Exclude &&
x >= scissor_right && x <= scissor_left &&
y >= scissor_bottom && y <= scissor_top) {
continue;
}
// Calculate the barycentric coordinates w0, w1 and w2
int w0 = bias0 + SignedArea(vtxpos[1].xy(), vtxpos[2].xy(), {x, y});
int w1 = bias1 + SignedArea(vtxpos[2].xy(), vtxpos[0].xy(), {x, y});