GPU: Add support for stencil buffer texturing mode.

This adds the possibility to read the stencil buffer inside shaders.
This is only available on GL 4.3 so use it accordingly.

2 files changed, 7 insertions, 0 deletions

diff --git a/source/blender/gpu/intern/gpu_texture.cc b/source/blender/gpu/intern/gpu_texture.cc
index 1aebf2ff112..0d2ec43533f 100644
--- a/source/blender/gpu/intern/gpu_texture.cc
+++ b/source/blender/gpu/intern/gpu_texture.cc
@@ -550,6 +550,12 @@ void GPU_texture_swizzle_set(GPUTexture *tex, const char swizzle[4])
   reinterpret_cast<Texture *>(tex)->swizzle_set(swizzle);
 }
 
+void GPU_texture_stencil_texture_mode_set(GPUTexture *tex, bool use_stencil)
+{
+  BLI_assert(GPU_texture_stencil(tex) || !use_stencil);
+  reinterpret_cast<Texture *>(tex)->stencil_texture_mode_set(use_stencil);
+}
+
 void GPU_texture_free(GPUTexture *tex_)
 {
   Texture *tex = reinterpret_cast<Texture *>(tex_);
diff --git a/source/blender/gpu/intern/gpu_texture_private.hh b/source/blender/gpu/intern/gpu_texture_private.hh
index 2a7fc074046..1e81980e95f 100644
--- a/source/blender/gpu/intern/gpu_texture_private.hh
+++ b/source/blender/gpu/intern/gpu_texture_private.hh
@@ -117,6 +117,7 @@ class Texture {
   virtual void copy_to(Texture *tex) = 0;
   virtual void clear(eGPUDataFormat format, const void *data) = 0;
   virtual void swizzle_set(const char swizzle_mask[4]) = 0;
+  virtual void stencil_texture_mode_set(bool use_stencil) = 0;
   virtual void mip_range_set(int min, int max) = 0;
   virtual void *read(int mip, eGPUDataFormat format) = 0;