GL3: Bigger, fewer Lightmap textures, cleanups

if the lightmap textures are 1024x512 instead of 128x128, all original
Q2 levels will only need one lightmap texture (instead of max 26 or so)
and even maps that needed all 127 (the 128th was the dynamic lightmap)
won't need more than 4.
This should result in less glBindTexture() calls.

(Note: When I wrote "1 lightmap texture" I meant 4, because where the
 old renderer dynamically blended the up to 4 lightmaps/surface, I put
 them in 4 textures that belong together and are alle passed to and
 blended in the fragment shader)

src/client/header/ref.h

@@ -176,10 +176,8 @@ typedef struct
 	struct image_s * (EXPORT *DrawFindPic)(char *name);
 
 	void	(EXPORT *DrawGetPicSize) (int *w, int *h, char *name);	// will return 0 0 if not found
-	//void	(EXPORT *DrawPic) (int x, int y, char *name); - apparently not used anymore
 	void 	(EXPORT *DrawPicScaled) (int x, int y, char *pic, float factor);
 	void	(EXPORT *DrawStretchPic) (int x, int y, int w, int h, char *name);
-	void	(EXPORT *DrawChar) (int x, int y, int c);
 	void	(EXPORT *DrawCharScaled)(int x, int y, int num, float scale);
 	void	(EXPORT *DrawTileClear) (int x, int y, int w, int h, char *name);
 	void	(EXPORT *DrawFill) (int x, int y, int w, int h, int c);

src/client/refresh/gl3/gl3_image.c

@@ -132,6 +132,7 @@ GL3_Bind(GLuint texnum)
 void
 GL3_BindLightmap(int lightmapnum)
 {
+	int i=0;
 	if(lightmapnum < 0 || lightmapnum >= MAX_LIGHTMAPS)
 	{
 		R_Printf(PRINT_ALL, "WARNING: Invalid lightmapnum %i used!\n", lightmapnum);
@@ -144,14 +145,13 @@ GL3_BindLightmap(int lightmapnum)
 	}
 
 	gl3state.currentlightmap = lightmapnum;
-	GL3_SelectTMU(GL_TEXTURE1);
-	glBindTexture(GL_TEXTURE_2D, gl3state.lightmap_textureIDs[lightmapnum][0]);
-	GL3_SelectTMU(GL_TEXTURE2);
-	glBindTexture(GL_TEXTURE_2D, gl3state.lightmap_textureIDs[lightmapnum][1]);
-	GL3_SelectTMU(GL_TEXTURE3);
-	glBindTexture(GL_TEXTURE_2D, gl3state.lightmap_textureIDs[lightmapnum][2]);
-	GL3_SelectTMU(GL_TEXTURE4);
-	glBindTexture(GL_TEXTURE_2D, gl3state.lightmap_textureIDs[lightmapnum][3]);
+	for(i=0; i<MAX_LIGHTMAPS_PER_SURFACE; ++i)
+	{
+		// this assumes that GL_TEXTURE<i+1> = GL_TEXTURE<i> + 1
+		// at least for GL_TEXTURE0 .. GL_TEXTURE31 that's true
+		GL3_SelectTMU(GL_TEXTURE1+i);
+		glBindTexture(GL_TEXTURE_2D, gl3state.lightmap_textureIDs[lightmapnum][i]);
+	}
 }
 
 /*

src/client/refresh/gl3/gl3_lightmap.c

@@ -241,7 +241,7 @@ GL3_LM_BeginBuildingLightmaps(gl3model_t *m)
 
 	gl3_newrefdef.lightstyles = lightstyles;
 
-	gl3_lms.current_lightmap_texture = 1;
+	gl3_lms.current_lightmap_texture = 0;
 	gl3_lms.internal_format = GL_LIGHTMAP_FORMAT;
 
 	// Note: the dynamic lightmap used to be initialized here, we don't use that anymore.

src/client/refresh/gl3/gl3_main.c

@@ -1503,7 +1503,10 @@ GL3_RenderFrame(refdef_t *fd)
 	GL3_SetLightLevel();
 	GL3_SetGL2D();
 
-	GL3_Draw_Flash(v_blend);
+	if(v_blend[3] != 0.0f)
+	{
+		GL3_Draw_Flash(v_blend);
+	}
 }
 
 

src/client/refresh/gl3/gl3_model.c

@@ -984,6 +984,8 @@ GL3_BeginRegistration(char *model)
 	registration_sequence++;
 	gl3_oldviewcluster = -1; /* force markleafs */
 
+	gl3state.currentlightmap = -1;
+
 	Com_sprintf(fullname, sizeof(fullname), "maps/%s.bsp", model);
 
 	/* explicitly free the old map if different

src/client/refresh/gl3/gl3_surf.c

@@ -839,11 +839,16 @@ RecursiveWorldNode(mnode_t *node)
 		}
 		else
 		{
+			// calling RenderLightmappedPoly() here probably isn't optimal, rendering everything
+			// through texturechains should be faster, because far less glBindTexture() is needed
+			// (and it might allow batching the drawcalls of surfaces with the same texture)
+#if 0
 			if(!(surf->flags & SURF_DRAWTURB))
 			{
 				RenderLightmappedPoly(surf);
 			}
 			else
+#endif // 0
 			{
 				/* the polygon is visible, so add it to the texture sorted chain */
 				image = TextureAnimation(surf->texinfo);

src/client/refresh/gl3/header/local.h

@@ -70,7 +70,7 @@ enum {
 	GL3_ATTRIB_TEXCOORD   = 1, // for normal texture
 	GL3_ATTRIB_LMTEXCOORD = 2, // for lightmap
 	GL3_ATTRIB_COLOR      = 3, // per-vertex color
-	// TODO: more? maybe normal and color?
+	// TODO: more? maybe normal
 };
 
 // TODO: do we need the following configurable?
@@ -143,10 +143,12 @@ typedef struct
 } gl3Uni3D_t;
 
 enum {
-	BLOCK_WIDTH = 128,
-	BLOCK_HEIGHT = 128,
+	// width and height used to be 128, so now we should be able to get the same lightmap data
+	// that used 32 lightmaps before into one, so 4 lightmaps should be enough
+	BLOCK_WIDTH = 1024,
+	BLOCK_HEIGHT = 512,
 	LIGHTMAP_BYTES = 4,
-	MAX_LIGHTMAPS = 128,
+	MAX_LIGHTMAPS = 4,
 	MAX_LIGHTMAPS_PER_SURFACE = MAXLIGHTMAPS // 4
 };
 
@@ -160,9 +162,9 @@ typedef struct
 
 	unsigned char *d_16to8table;
 
-	// "So color textures start at 0, the dynamic lightmap texture is always 1024 and the static lighmap are 1025 up to 1036."
-	// yes, dynamic lightmap is 1024, but I think there can be 127 dynamic lightmaps (MAX_LIGHTMAPS == 128)
-	//int lightmap_textures;
+	// each lightmap consists of 4 sub-lightmaps allowing changing shadows on the same surface
+	// used for switching on/off light and stuff like that.
+	// most surfaces only have one really and the remaining for are filled with dummy data
 	GLuint lightmap_textureIDs[MAX_LIGHTMAPS][MAX_LIGHTMAPS_PER_SURFACE]; // instead of lightmap_textures+i use lightmap_textureIDs[i]
 
 	//int currenttextures[2];