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softgpu: Optimization, part 1.

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Tony Wasserka 2013-07-24 10:24:41 +02:00 committed by neobrain
parent 002ab3e3ad
commit 0c6a9dcf50
1 changed files with 14 additions and 5 deletions
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19
GPU/Software/Rasterizer.cpp
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@ -390,11 +390,20 @@ void DrawTriangle(const VertexData& v0, const VertexData& v1, const VertexData&
int bias2 = IsRightSideOrFlatBottomLine(v2.drawpos.xy(), v0.drawpos.xy(), v1.drawpos.xy()) ? -1 : 0;
DrawingCoords p(minX, minY, 0);
for (p.y = minY; p.y <= maxY; ++p.y) {
for (p.x = minX; p.x <= maxX; ++p.x) {
int w0 = orient2d(v1.drawpos, v2.drawpos, p);
int w1 = orient2d(v2.drawpos, v0.drawpos, p);
int w2 = orient2d(v0.drawpos, v1.drawpos, p);
int w0_base = orient2d(v1.drawpos, v2.drawpos, p);
int w1_base = orient2d(v2.drawpos, v0.drawpos, p);
int w2_base = orient2d(v0.drawpos, v1.drawpos, p);
for (p.y = minY; p.y <= maxY; ++p.y,
w0_base += (int)v2.drawpos.x - (int)v1.drawpos.x,
w1_base += (int)v0.drawpos.x - (int)v2.drawpos.x,
w2_base += (int)v1.drawpos.x - (int)v0.drawpos.x) {
int w0 = w0_base;
int w1 = w1_base;
int w2 = w2_base;
for (p.x = minX; p.x <= maxX; ++p.x,
w0 -= (int)v2.drawpos.y - (int)v1.drawpos.y,
w1 -= (int)v0.drawpos.y - (int)v2.drawpos.y,
w2 -= (int)v1.drawpos.y - (int)v0.drawpos.y) {
// If p is on or inside all edges, render pixel
// TODO: Should we render if the pixel is both on the left and the right side? (i.e. degenerated triangle)