Adding monitoring for (approximate) VRAM used by textures. The information is currently only used in the profiling data of the BGE.

Here is a image of it in action:
http://www.pasteall.org/pic/show.php?id=6351

What it monitors:
  * VRAM used by textures created via bf_gpu and BL_Textures

What it does not monitor:
  * VRAM used by the Blender ui
  * VRAM used by 2d filters
  * VRAM allocated by the user via KX_Scene.pre_draw and KX_Scene.pre_draw

3 files changed, 43 insertions, 1 deletions

diff --git a/source/blender/gpu/GPU_extensions.h b/source/blender/gpu/GPU_extensions.h
index a7f43d3b0ae..d545a553da9 100644
--- a/source/blender/gpu/GPU_extensions.h
+++ b/source/blender/gpu/GPU_extensions.h
@@ -104,6 +104,10 @@ int GPU_type_matches(GPUDeviceType device, GPUOSType os, GPUDriverType driver);
 	- if created with from_blender, will not free the texture
 */
 
+unsigned int GPU_texture_vram_usage(void);
+void GPU_texture_vram_add(unsigned int amount);
+void GPU_texture_vram_subtract(unsigned int amount);
+
 GPUTexture *GPU_texture_create_1D(int w, float *pixels);
 GPUTexture *GPU_texture_create_2D(int w, int h, float *pixels);
 GPUTexture *GPU_texture_create_3D(int w, int h, int depth, float *fpixels);
diff --git a/source/blender/gpu/intern/gpu_draw.c b/source/blender/gpu/intern/gpu_draw.c
index a93d8cbbb8e..2d15d3efae9 100644
--- a/source/blender/gpu/intern/gpu_draw.c
+++ b/source/blender/gpu/intern/gpu_draw.c
@@ -540,11 +540,13 @@ int GPU_verify_image(Image *ima, ImageUser *iuser, int tftile, int compare, int
 
 	if (!(gpu_get_mipmap() && mipmap)) {
 		glTexImage2D(GL_TEXTURE_2D, 0,  GL_RGBA,  rectw, recth, 0, GL_RGBA, GL_UNSIGNED_BYTE, rect);
+		GPU_texture_vram_add(rectw*recth*4);
 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gpu_get_mipmap_filter(1));
 	}
 	else {
 		gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGBA, rectw, recth, GL_RGBA, GL_UNSIGNED_BYTE, rect);
+		GPU_texture_vram_add((rectw*recth*4) + (rectw*recth*4)/3);
 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gpu_get_mipmap_filter(0));
 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gpu_get_mipmap_filter(1));
 
@@ -817,6 +819,8 @@ void GPU_free_unused_buffers(void)
 
 void GPU_free_image(Image *ima)
 {
+	ImBuf *ibuf;
+
 	if(!BLI_thread_is_main()) {
 		gpu_queue_image_for_free(ima);
 		return;
@@ -827,6 +831,13 @@ void GPU_free_image(Image *ima)
 		glDeleteTextures(1, (GLuint *)&ima->bindcode);
 		ima->bindcode= 0;
 		ima->tpageflag &= ~IMA_MIPMAP_COMPLETE;
+
+		// Calculate how much vram was freed
+		ibuf = BKE_image_get_ibuf(ima, NULL);
+		if (!gpu_get_mipmap())
+			GPU_texture_vram_subtract(ibuf->x*ibuf->y*4);
+		else
+			GPU_texture_vram_subtract((ibuf->x*ibuf->y*4)+(ibuf->x*ibuf->y*4)/3);
 	}
 
 	/* free glsl image binding */
diff --git a/source/blender/gpu/intern/gpu_extensions.c b/source/blender/gpu/intern/gpu_extensions.c
index 70a74aafead..4298ec8d44d 100644
--- a/source/blender/gpu/intern/gpu_extensions.c
+++ b/source/blender/gpu/intern/gpu_extensions.c
@@ -66,11 +66,12 @@ static struct GPUGlobal {
 	GLuint currentfb;
 	int glslsupport;
 	int extdisabled;
+	unsigned int texturevram; // An approximation of how much vram is being used for textures
 	int colordepth;
 	GPUDeviceType device;
 	GPUOSType os;
 	GPUDriverType driver;
-} GG = {1, 0, 0, 0};
+} GG = {1, 0, 0, 0, 0};
 
 /* GPU Types */
 
@@ -185,6 +186,21 @@ int GPU_color_depth()
     return GG.colordepth;
 }
 
+unsigned int GPU_texture_vram_usage()
+{
+	return GG.texturevram;
+}
+
+void GPU_texture_vram_add(unsigned int amount)
+{
+	GG.texturevram += amount;
+}
+
+void GPU_texture_vram_subtract(unsigned int amount)
+{
+	GG.texturevram -= amount;
+}
+
 int GPU_print_error(char *str)
 {
 	GLenum errCode;
@@ -343,6 +359,8 @@ static GPUTexture *GPU_texture_create_nD(int w, int h, int n, float *fpixels, in
 	if (tex->target == GL_TEXTURE_1D) {
 		glTexImage1D(tex->target, 0, internalformat, tex->w, 0, format, type, 0);
 
+		GPU_texture_vram_add(tex->w*4);
+
 		if (fpixels) {
 			glTexSubImage1D(tex->target, 0, 0, w, format, type,
 				pixels? pixels: fpixels);
@@ -356,6 +374,8 @@ static GPUTexture *GPU_texture_create_nD(int w, int h, int n, float *fpixels, in
 		glTexImage2D(tex->target, 0, internalformat, tex->w, tex->h, 0,
 			format, type, 0);
 
+		GPU_texture_vram_add(tex->w*tex->h*4);
+
 		if (fpixels) {
 			glTexSubImage2D(tex->target, 0, 0, 0, w, h,
 				format, type, pixels? pixels: fpixels);
@@ -620,8 +640,15 @@ void GPU_texture_free(GPUTexture *tex)
 		if (tex->fb)
 			GPU_framebuffer_texture_detach(tex->fb, tex);
 		if (tex->bindcode && !tex->fromblender)
+		{
 			glDeleteTextures(1, &tex->bindcode);
 
+			if (tex->target == GL_TEXTURE_2D)
+				GPU_texture_vram_subtract(tex->w*tex->h*4);
+			else
+				GPU_texture_vram_subtract(tex->w*4);
+		}
+
 		MEM_freeN(tex);
 	}
 }