Cleanup: GPU: Encapsulate Backface culling

2 files changed, 18 insertions, 0 deletions

diff --git a/source/blender/gpu/GPU_state.h b/source/blender/gpu/GPU_state.h
index e6b002f211c..0a97016e06d 100644
--- a/source/blender/gpu/GPU_state.h
+++ b/source/blender/gpu/GPU_state.h
@@ -40,6 +40,12 @@ typedef enum eGPUFilterFunction {
   GPU_LINEAR,
 } eGPUFilterFunction;
 
+typedef enum eGPUFaceCull {
+  GPU_CULL_NONE = 0, /* Culling disabled. */
+  GPU_CULL_FRONT,
+  GPU_CULL_BACK,
+} eGPUFaceCull;
+
 /* Initialize
  * - sets the default Blender opengl state, if in doubt, check
  *   the contents of this function
@@ -52,6 +58,7 @@ void GPU_blend_set_func_separate(eGPUBlendFunction src_rgb,
                                  eGPUBlendFunction dst_rgb,
                                  eGPUBlendFunction src_alpha,
                                  eGPUBlendFunction dst_alpha);
+void GPU_face_culling(eGPUFaceCull culling);
 void GPU_depth_range(float near, float far);
 void GPU_depth_test(bool enable);
 bool GPU_depth_test_enabled(void);
diff --git a/source/blender/gpu/intern/gpu_state.c b/source/blender/gpu/intern/gpu_state.c
index a339cfb8b5a..6d707161e97 100644
--- a/source/blender/gpu/intern/gpu_state.c
+++ b/source/blender/gpu/intern/gpu_state.c
@@ -78,6 +78,17 @@ void GPU_blend_set_func_separate(eGPUBlendFunction src_rgb,
                       gpu_get_gl_blendfunction(dst_alpha));
 }
 
+void GPU_face_culling(eGPUFaceCull culling)
+{
+  if (culling == GPU_CULL_NONE) {
+    glDisable(GL_CULL_FACE);
+  }
+  else {
+    glEnable(GL_CULL_FACE);
+    glCullFace((culling == GPU_CULL_FRONT) ? GL_FRONT : GL_BACK);
+  }
+}
+
 void GPU_depth_range(float near, float far)
 {
   /* glDepthRangef is only for OpenGL 4.1 or higher */