OpenGL2: Add r_exportCubemaps for saving cubemaps on map load.

code/renderergl2/tr_bsp.c

@@ -3067,9 +3067,13 @@ void R_AssignCubemapsToWorldSurfaces(void)
 	}
 }
 
+// FIXME: put this function declaration elsewhere
+void R_SaveDDS(const char *filename, byte *pic, int width, int height, int depth);
 
 void R_RenderAllCubemaps(void)
 {
+	byte *data = NULL;
+	int sideSize = CUBE_MAP_SIZE * CUBE_MAP_SIZE * 4;
 	int i, j;
 
 	for (i = 0; i < tr.numCubemaps; i++)
@@ -3077,6 +3081,9 @@ void R_RenderAllCubemaps(void)
 		tr.cubemaps[i].image = R_CreateImage(va("*cubeMap%d", i), NULL, CUBE_MAP_SIZE, CUBE_MAP_SIZE, IMGTYPE_COLORALPHA, IMGFLAG_NO_COMPRESSION | IMGFLAG_CLAMPTOEDGE | IMGFLAG_MIPMAP | IMGFLAG_CUBEMAP, GL_RGBA8);
 	}
 
+	if (r_exportCubemaps->integer)
+		data = ri.Malloc(sideSize * 6);
+
 	for (i = 0; i < tr.numCubemaps; i++)
 	{
 		for (j = 0; j < 6; j++)
@@ -3086,6 +3093,34 @@ void R_RenderAllCubemaps(void)
 			R_IssuePendingRenderCommands();
 			R_InitNextFrame();
 		}
+
+		if (r_exportCubemaps->integer)
+		{
+			char filename[MAX_QPATH];
+			byte *p;
+			cubemap_t *cubemap = &tr.cubemaps[i];
+
+			// FIXME: do this in backEnd
+			FBO_Bind(tr.renderCubeFbo);
+
+			p = data;
+			for (j = 0; j < 6; j++)
+			{
+				qglFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_CUBE_MAP_POSITIVE_X + j, cubemap->image->texnum, 0);
+				qglReadPixels(0, 0, CUBE_MAP_SIZE, CUBE_MAP_SIZE, GL_RGBA, GL_UNSIGNED_BYTE, p);
+				p += sideSize;
+			}
+			FBO_Bind(NULL);
+
+			Com_sprintf(filename, MAX_QPATH, "cubemaps/%s/%03d.dds", tr.world->baseName, backEnd.viewParms.targetFboCubemapIndex);
+			R_SaveDDS(filename, data, CUBE_MAP_SIZE, CUBE_MAP_SIZE, 6);
+		}
+	}
+
+	if (r_exportCubemaps->integer)
+	{
+		ri.Cvar_Set("r_exportCubemaps", "0");
+		ri.Free(data);
 	}
 }
 

code/renderergl2/tr_image_dds.c

@@ -451,3 +451,48 @@ void R_LoadDDS ( const char *filename, byte **pic, int *width, int *height, GLen
 
 	ri.FS_FreeFile(buffer.v);
 }
+
+void R_SaveDDS(const char *filename, byte *pic, int width, int height, int depth)
+{
+	byte *data;
+	ddsHeader_t *ddsHeader;
+	int picSize, size;
+
+	if (!depth)
+		depth = 1;
+
+	picSize = width * height * depth * 4;
+	size = 4 + sizeof(*ddsHeader) + picSize;
+	data = ri.Malloc(size);
+
+	data[0] = 'D';
+	data[1] = 'D';
+	data[2] = 'S';
+	data[3] = ' ';
+
+	ddsHeader = (ddsHeader_t *)(data + 4);
+	memset(ddsHeader, 0, sizeof(ddsHeader_t));
+
+	ddsHeader->headerSize = 0x7c;
+	ddsHeader->flags = _DDSFLAGS_REQUIRED;
+	ddsHeader->height = height;
+	ddsHeader->width = width;
+	ddsHeader->always_0x00000020 = 0x00000020;
+	ddsHeader->caps = DDSCAPS_COMPLEX | DDSCAPS_REQUIRED;
+
+	if (depth == 6)
+		ddsHeader->caps2 = DDSCAPS2_CUBEMAP;
+
+	ddsHeader->pixelFormatFlags = DDSPF_RGB | DDSPF_ALPHAPIXELS;
+	ddsHeader->rgbBitCount = 32;
+	ddsHeader->rBitMask = 0x000000ff;
+	ddsHeader->gBitMask = 0x0000ff00;
+	ddsHeader->bBitMask = 0x00ff0000;
+	ddsHeader->aBitMask = 0xff000000;
+
+	Com_Memcpy(data + 4 + sizeof(*ddsHeader), pic, picSize);
+
+	ri.FS_WriteFile(filename, data, size);
+
+	ri.Free(data);
+}

code/renderergl2/tr_init.c

@@ -142,6 +142,7 @@ cvar_t  *r_specularMapping;
 cvar_t  *r_deluxeMapping;
 cvar_t  *r_parallaxMapping;
 cvar_t  *r_cubeMapping;
+cvar_t  *r_exportCubemaps;
 cvar_t  *r_specularIsMetallic;
 cvar_t  *r_glossIsRoughness;
 cvar_t  *r_baseNormalX;
@@ -455,6 +456,7 @@ byte *RB_ReadPixels(int x, int y, int width, int height, size_t *offset, int *pa
 	buffer = ri.Hunk_AllocateTempMemory(padwidth * height + *offset + packAlign - 1);
 	
 	bufstart = PADP((intptr_t) buffer + *offset, packAlign);
+
 	qglReadPixels(x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, bufstart);
 	
 	*offset = bufstart - buffer;
@@ -1213,6 +1215,7 @@ void R_Register( void )
 	r_deluxeMapping = ri.Cvar_Get( "r_deluxeMapping", "1", CVAR_ARCHIVE | CVAR_LATCH );
 	r_parallaxMapping = ri.Cvar_Get( "r_parallaxMapping", "0", CVAR_ARCHIVE | CVAR_LATCH );
 	r_cubeMapping = ri.Cvar_Get( "r_cubeMapping", "0", CVAR_ARCHIVE | CVAR_LATCH );
+	r_exportCubemaps = ri.Cvar_Get("r_exportCubemaps", "0", 0);
 	r_specularIsMetallic = ri.Cvar_Get( "r_specularIsMetallic", "0", CVAR_ARCHIVE | CVAR_LATCH );
 	r_glossIsRoughness = ri.Cvar_Get("r_glossIsRoughness", "0", CVAR_ARCHIVE | CVAR_LATCH);
 	r_baseNormalX = ri.Cvar_Get( "r_baseNormalX", "1.0", CVAR_ARCHIVE | CVAR_LATCH );

code/renderergl2/tr_local.h

@@ -1792,6 +1792,7 @@ extern  cvar_t  *r_specularMapping;
 extern  cvar_t  *r_deluxeMapping;
 extern  cvar_t  *r_parallaxMapping;
 extern  cvar_t  *r_cubeMapping;
+extern  cvar_t  *r_exportCubemaps;
 extern  cvar_t  *r_specularIsMetallic;
 extern  cvar_t  *r_glossIsRoughness;
 extern  cvar_t  *r_baseNormalX;