From 854f474f52ea49e26d61680e775b1c91e644b2fc Mon Sep 17 00:00:00 2001 From: bunnei Date: Sun, 8 Jul 2018 12:27:15 -0400 Subject: [PATCH] gl_rasterizer: Flip triangles when regs.viewport_transform[0].scale_y is negative. - Fixes a regression with Binding of Isaac. --- src/video_core/renderer_opengl/gl_rasterizer.cpp | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/src/video_core/renderer_opengl/gl_rasterizer.cpp b/src/video_core/renderer_opengl/gl_rasterizer.cpp index bacb389e1..ea138d402 100644 --- a/src/video_core/renderer_opengl/gl_rasterizer.cpp +++ b/src/video_core/renderer_opengl/gl_rasterizer.cpp @@ -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)