Clay-Engine (merge clay-engine)

Initial work by Clément Foucault with contributions from Dalai Felinto
(mainly per-collection engine settings logic, and depsgraph iterator placeholder).

This makes Blender require OpenGL 3.3. Which means Intel graphic card
and OSX will break. Disable CLAY_ENGINE in CMake in those cases.

This is a prototype render engine intended to help the design of real
render engines. This is mainly an engine with enphasis in matcap and
ambient occlusion.

Implemented Features
--------------------

* Clay Render Engine, following the new API, to be used as reference for
future engines

* A more complete Matcap customization with more options

* Per-Collection render engine settings

* New Ground Truth AO - not enabled

Missing Features
----------------

* Finish object edit mode
  - Fix shaders to use new matrix
  - Fix artifacts when edge does off screen
  - Fix depth issue
  - Selection sillhouette
  - Mesh wires
  - Use mesh normals (for higher quality matcap)
  - Non-Mesh objects drawing
  - Widget drawing
  - Performance issues

* Finish mesh edit mode
  - Derived-Mesh-less edit mode API (mesh_rende.c)

* General edit mode
  - Per-collection edit mode settings

* General engines
  - Per-collection engine settings
    (they are their, but they still need to be flushed by depsgraph, and
    used by the drawing code)

1 files changed, 9 insertions, 0 deletions

diff --git a/source/blender/gpu/GPU_shader.h b/source/blender/gpu/GPU_shader.h
index 394e751ed9b..b36954dd010 100644
--- a/source/blender/gpu/GPU_shader.h
+++ b/source/blender/gpu/GPU_shader.h
@@ -38,6 +38,7 @@ extern "C" {
 
 typedef struct GPUShader GPUShader;
 struct GPUTexture;
+struct GPUUniformBuffer;
 
 /* GPU Shader
  * - only for fragment shaders now
@@ -69,14 +70,17 @@ void GPU_shader_free(GPUShader *shader);
 void GPU_shader_bind(GPUShader *shader);
 void GPU_shader_unbind(void);
 
+int GPU_shader_get_program(GPUShader *shader);
 void *GPU_shader_get_interface(GPUShader *shader);
 void GPU_shader_set_interface(GPUShader *shader, void *interface);
 int GPU_shader_get_uniform(GPUShader *shader, const char *name);
+int GPU_shader_get_uniform_block(GPUShader *shader, const char *name);
 void GPU_shader_uniform_vector(GPUShader *shader, int location, int length,
 	int arraysize, const float *value);
 void GPU_shader_uniform_vector_int(GPUShader *shader, int location, int length,
 	int arraysize, const int *value);
 
+void GPU_shader_uniform_buffer(GPUShader *shader, int location, struct GPUUniformBuffer *ubo);
 void GPU_shader_uniform_texture(GPUShader *shader, int location, struct GPUTexture *tex);
 void GPU_shader_uniform_int(GPUShader *shader, int location, int value);
 void GPU_shader_geometry_stage_primitive_io(GPUShader *shader, int input, int output, int number);
@@ -104,6 +108,7 @@ typedef enum GPUBuiltinShader {
 	GPU_SHADER_2D_IMAGE_COLOR,
 	/* for simple 3D drawing */
 	GPU_SHADER_3D_UNIFORM_COLOR,
+	GPU_SHADER_3D_UNIFORM_COLOR_INSTANCE,
 	GPU_SHADER_3D_FLAT_COLOR,
 	GPU_SHADER_3D_SMOOTH_COLOR,
 	GPU_SHADER_3D_DEPTH_ONLY,
@@ -126,6 +131,10 @@ typedef enum GPUBuiltinShader {
 	GPU_SHADER_3D_POINT_UNIFORM_SIZE_UNIFORM_COLOR_OUTLINE_SMOOTH,
 	GPU_SHADER_3D_POINT_VARYING_SIZE_UNIFORM_COLOR,
 	GPU_SHADER_3D_POINT_VARYING_SIZE_VARYING_COLOR,
+	/* lamp drawing */
+	GPU_SHADER_3D_GROUNDPOINT,
+	GPU_SHADER_3D_GROUNDLINE,
+	GPU_SHADER_3D_LAMP_COMMON,
 
 	GPU_NUM_BUILTIN_SHADERS /* (not an actual shader) */
 } GPUBuiltinShader;