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softgpu: Avoid a divide by 0 in line interpolation.

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Fixes crash in Persona 2 loading screens.
This commit is contained in:
Unknown W. Brackets 2014-01-19 23:32:12 -08:00
parent 74c1b21b59
commit 8271ec1a55
1 changed files with 4 additions and 3 deletions
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7
GPU/Software/Rasterizer.cpp
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@ -1285,14 +1285,15 @@ void DrawLine(const VertexData &v0, const VertexData &v1)
float x = a.x;
float y = a.y;
float z = a.z;
const int steps1 = steps == 0 ? 1 : steps;
for (int i = 0; i <= steps; i++) {
if (x < scissorTL.x || y < scissorTL.y || x >= scissorBR.x || y >= scissorBR.y)
continue;
Vec4<int> c0 = (v0.color0 * (steps - i) + v1.color0 * i) / steps;
Vec3<int> sec_color = (v0.color1 * (steps - i) + v1.color1 * i) / steps;
Vec4<int> c0 = (v0.color0 * (steps - i) + v1.color0 * i) / steps1;
Vec3<int> sec_color = (v0.color1 * (steps - i) + v1.color1 * i) / steps1;
// TODO: UVGenMode?
Vec2<float> tc = (v0.texturecoords * (float)(steps - i) + v1.texturecoords * (float)i) / steps;
Vec2<float> tc = (v0.texturecoords * (float)(steps - i) + v1.texturecoords * (float)i) / steps1;
Vec3<int> prim_color_rgb = c0.rgb();
int prim_color_a = c0.a();
float s = tc.s();