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GPU: Flip the triangle front face winding if the GPU is configured to not flip the triangles.

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OpenGL's default behavior is already correct when the GPU is configured to flip the triangles.

This fixes 1-2 Switch's splash screen.
This commit is contained in:
Subv 2018-07-04 10:26:46 -05:00
parent 18115aede8
commit 70f55cf738
2 changed files with 29 additions and 3 deletions
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10
src/video_core/renderer_opengl/gl_rasterizer.cpp
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@ -771,6 +771,16 @@ void RasterizerOpenGL::SyncCullMode() {
if (state.cull.enabled) {
state.cull.front_face = MaxwellToGL::FrontFace(regs.cull.front_face);
state.cull.mode = MaxwellToGL::CullFace(regs.cull.cull_face);
// 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 (state.cull.front_face == GL_CCW)
state.cull.front_face = GL_CW;
else if (state.cull.front_face == GL_CW)
state.cull.front_face = GL_CCW;
}
}
}