GPU buffers refactor

source/blender/gpu/GPU_buffers.h

Index: source/blender/gpu/GPU_buffers.h
===================================================================
--- source/blender/gpu/GPU_buffers.h	(revision 37642)
+++ source/blender/gpu/GPU_buffers.h	(working copy)
@@ -37,8 +37,6 @@
 #ifndef __GPU_BUFFERS_H__
 #define __GPU_BUFFERS_H__
 
-#define MAX_FREE_GPU_BUFFERS 8
-
 #ifdef _DEBUG
 /*#define DEBUG_VBO(X) printf(X)*/
 #define DEBUG_VBO(X)
@@ -46,112 +44,92 @@
 #define DEBUG_VBO(X)
 #endif
 
-#ifdef _DEBUG
-#define ERROR_VBO(X) printf(X)
-#else
-#define ERROR_VBO(X)
-#endif
-
 struct DerivedMesh;
 struct DMGridData;
 struct GHash;
 struct DMGridData;
+struct GPUVertPointLink;
 
-/* V - vertex, N - normal, T - uv, C - color
-   F - float, UB - unsigned byte */
-#define GPU_BUFFER_INTER_V3F	1
-#define GPU_BUFFER_INTER_N3F	2
-#define GPU_BUFFER_INTER_T2F	3
-#define GPU_BUFFER_INTER_C3UB	4
-#define GPU_BUFFER_INTER_C4UB	5
-#define GPU_BUFFER_INTER_END	-1
-
-typedef struct GPUBuffer
-{
+typedef struct GPUBuffer {
 	int size;	/* in bytes */
 	void *pointer;	/* used with vertex arrays */
 	unsigned int id;	/* used with vertex buffer objects */
 } GPUBuffer;
 
-/* stores deleted buffers so that new buffers wouldn't have to 
-be recreated that often. */
-typedef struct GPUBufferPool
-{
-	int size;		/* number of allocated buffers stored */
-	int maxsize;	/* size of the array */
-	GPUBuffer **buffers;
-} GPUBufferPool;
+typedef struct GPUBufferMaterial {
+	/* range of points used for this material */
+	int start;
+	int totpoint;
 
-typedef struct GPUBufferMaterial
-{
-	int start;	/* at which vertex in the buffer the material starts */
-	int end;	/* at which vertex it ends */
-	char mat_nr;
+	/* original material index */
+	short mat_nr;
 } GPUBufferMaterial;
 
-typedef struct IndexLink {
-	int element;
-	struct IndexLink *next;
-} IndexLink;
+/* meshes are split up by material since changing materials requires
+   GL state changes that can't occur in the middle of drawing an
+   array.
 
-typedef struct GPUDrawObject
-{
-	GPUBuffer *vertices;
+   some simplifying assumptions are made:
+   * all quads are treated as two triangles.
+   * no vertex sharing is used; each triangle gets its own copy of the
+     vertices it uses (this makes it easy to deal with a vertex used
+     by faces with different properties, such as smooth/solid shading,
+     different MCols, etc.)
+
+   to avoid confusion between the original MVert vertices and the
+   arrays of OpenGL vertices, the latter are referred to here and in
+   the source as `points'. similarly, the OpenGL triangles generated
+   for MFaces are referred to as triangles rather than faces.
+ */
+typedef struct GPUDrawObject {
+	GPUBuffer *points;
 	GPUBuffer *normals;
 	GPUBuffer *uv;
 	GPUBuffer *colors;
 	GPUBuffer *edges;
 	GPUBuffer *uvedges;
 
-	int	*faceRemap;			/* at what index was the face originally in DerivedMesh */
-	IndexLink *indices;		/* given an index, find all elements using it */
-	IndexLink *indexMem;	/* for faster memory allocation/freeing */
-	int indexMemUsage;		/* how many are already allocated */
+	/* for each triangle, the original MFace index */
+	int *triangle_to_mface;
+
+	/* for each original vertex, the list of related points */
+	struct GPUVertPointLink *vert_points;
+	/* storage for the vert_points lists */
+	struct GPUVertPointLink *vert_points_mem;
+	int vert_points_usage;
+	
 	int colType;
 
 	GPUBufferMaterial *materials;
+	int totmaterial;
+	
+	int tot_triangle_point;
+	int tot_loose_point;
+	
+	/* caches of the original DerivedMesh values */
+	int totvert;
+	int totedge;
 
-	int nmaterials;
-	int nelements;	/* (number of faces) * 3 */
-	int nlooseverts;
-	int nedges;
-	int nindices;
-	int legacy;	/* if there was a failure allocating some buffer, use old rendering code */
-
+	/* if there was a failure allocating some buffer, use old
+	   rendering code */
+	int legacy;
 } GPUDrawObject;
 
 /* used for GLSL materials */
-typedef struct GPUAttrib
-{
+typedef struct GPUAttrib {
 	int index;
 	int size;
 	int type;
 } GPUAttrib;
 
-GPUBufferPool *GPU_buffer_pool_new(void);
-void GPU_buffer_pool_free( GPUBufferPool *pool );
-void GPU_buffer_pool_free_unused( GPUBufferPool *pool );
+void GPU_global_buffer_pool_free(void);
 
-GPUBuffer *GPU_buffer_alloc( int size, GPUBufferPool *pool );
-void GPU_buffer_free( GPUBuffer *buffer, GPUBufferPool *pool );
+GPUBuffer *GPU_buffer_alloc(int size);
+void GPU_buffer_free(GPUBuffer *buffer);
 
 GPUDrawObject *GPU_drawobject_new( struct DerivedMesh *dm );
 void GPU_drawobject_free( struct DerivedMesh *dm );
 
-/* Buffers for non-DerivedMesh drawing */
-void *GPU_build_mesh_buffers(struct GHash *map, struct MVert *mvert,
-			struct MFace *mface, int *face_indices,
-			int totface, int *vert_indices, int uniq_verts,
-			int totvert);
-void GPU_update_mesh_buffers(void *buffers, struct MVert *mvert,
-			int *vert_indices, int totvert);
-void *GPU_build_grid_buffers(struct DMGridData **grids,
-	int *grid_indices, int totgrid, int gridsize);
-void GPU_update_grid_buffers(void *buffers_v, struct DMGridData **grids,
-	int *grid_indices, int totgrid, int gridsize, int smooth);
-void GPU_draw_buffers(void *buffers);
-void GPU_free_buffers(void *buffers);
-
 /* called before drawing */
 void GPU_vertex_setup( struct DerivedMesh *dm );
 void GPU_normal_setup( struct DerivedMesh *dm );
@@ -175,6 +153,7 @@
 /* switch color rendering on=1/off=0 */
 void GPU_color_switch( int mode );
 
+/* used for drawing edges */
 void GPU_buffer_draw_elements( GPUBuffer *elements, unsigned int mode, int start, int count );
 
 /* called after drawing */
@@ -183,4 +162,18 @@
 /* used to check whether to use the old (without buffers) code */
 int GPU_buffer_legacy( struct DerivedMesh *dm );
 
+/* Buffers for non-DerivedMesh drawing */
+void *GPU_build_mesh_buffers(struct GHash *map, struct MVert *mvert,
+			struct MFace *mface, int *face_indices,
+			int totface, int *vert_indices, int uniq_verts,
+			int totvert);
+void GPU_update_mesh_buffers(void *buffers, struct MVert *mvert,
+			int *vert_indices, int totvert);
+void *GPU_build_grid_buffers(struct DMGridData **grids,
+	int *grid_indices, int totgrid, int gridsize);
+void GPU_update_grid_buffers(void *buffers_v, struct DMGridData **grids,
+	int *grid_indices, int totgrid, int gridsize, int smooth);
+void GPU_draw_buffers(void *buffers);
+void GPU_free_buffers(void *buffers);
+
 #endif