gl_rasterizer: Limit OpenGL point size to a minimum of 1

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -1135,7 +1135,9 @@ void RasterizerOpenGL::SyncTransformFeedback() {
 
 void RasterizerOpenGL::SyncPointState() {
     const auto& regs = system.GPU().Maxwell3D().regs;
-    state.point.size = regs.point_size;
+    // Limit the point size to 1 since nouveau sometimes sets a point size of 0 (and that's invalid
+    // in OpenGL).
+    state.point.size = std::max(1.0f, regs.point_size);
 }
 
 void RasterizerOpenGL::SyncPolygonOffset() {