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gl_rasterizer: Flip triangles when regs.viewport_transform[0].scale_y is negative.

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- Fixes a regression with Binding of Isaac.
This commit is contained in:
bunnei 2018-07-08 12:27:15 -04:00
parent 639346bcfb
commit 854f474f52
1 changed files with 4 additions and 1 deletions
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5
src/video_core/renderer_opengl/gl_rasterizer.cpp
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@ -775,10 +775,13 @@ void RasterizerOpenGL::SyncCullMode() {
state.cull.front_face = MaxwellToGL::FrontFace(regs.cull.front_face);
state.cull.mode = MaxwellToGL::CullFace(regs.cull.cull_face);
const bool flip_triangles{regs.screen_y_control.triangle_rast_flip == 0 ||
regs.viewport_transform[0].scale_y < 0.0f};
// If the GPU is configured to flip the rasterized triangles, then we need to flip the
// notion of front and back. Note: We flip the triangles when the value of the register is 0
// because OpenGL already does it for us.
if (regs.screen_y_control.triangle_rast_flip == 0) {
if (flip_triangles) {
if (state.cull.front_face == GL_CCW)
state.cull.front_face = GL_CW;
else if (state.cull.front_face == GL_CW)