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gl_rasterizer: Flip triangles when regs.viewport_transform[0].scale_y is negative.
- Fixes a regression with Binding of Isaac.
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@ -775,10 +775,13 @@ void RasterizerOpenGL::SyncCullMode() {
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state.cull.front_face = MaxwellToGL::FrontFace(regs.cull.front_face);
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state.cull.front_face = MaxwellToGL::FrontFace(regs.cull.front_face);
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state.cull.mode = MaxwellToGL::CullFace(regs.cull.cull_face);
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state.cull.mode = MaxwellToGL::CullFace(regs.cull.cull_face);
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const bool flip_triangles{regs.screen_y_control.triangle_rast_flip == 0 ||
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regs.viewport_transform[0].scale_y < 0.0f};
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// If the GPU is configured to flip the rasterized triangles, then we need to flip the
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// If the GPU is configured to flip the rasterized triangles, then we need to flip the
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// notion of front and back. Note: We flip the triangles when the value of the register is 0
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// notion of front and back. Note: We flip the triangles when the value of the register is 0
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// because OpenGL already does it for us.
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// because OpenGL already does it for us.
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if (regs.screen_y_control.triangle_rast_flip == 0) {
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if (flip_triangles) {
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if (state.cull.front_face == GL_CCW)
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if (state.cull.front_face == GL_CCW)
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state.cull.front_face = GL_CW;
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state.cull.front_face = GL_CW;
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else if (state.cull.front_face == GL_CW)
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else if (state.cull.front_face == GL_CW)
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