Add support for dynamic textures to the low-level texture handler.

Use R_MakeTextureDynamic to make a standard texture dynamic and set its update callback, etc. and use R_MarkDirtyTexture to mark it dirty (ie. needs an update as soon as it is used again).

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@7711 d7cf8633-e32d-0410-b094-e92efae38249

diff --git a/gl_textures.c b/gl_textures.c
index f26b44ade3bd90ff29d83817ae6cf905d806c3e5..f32c848ec6adf91bb52c36af18e5f30dc66a9d86 100644 (file)
--- a/gl_textures.c
+++ b/gl_textures.c
@@ -28,11 +28,13 @@ static mempool_t *texturemempool;
 
 // note: this must not conflict with TEXF_ flags in r_textures.h
 // cleared when a texture is uploaded
-#define GLTEXF_UPLOAD 0x00010000
+#define GLTEXF_UPLOAD          0x00010000
 // bitmask for mismatch checking
 #define GLTEXF_IMPORTANTBITS (0)
 // set when image is uploaded and freed
-#define GLTEXF_DESTROYED 0x00040000
+#define GLTEXF_DESTROYED       0x00040000
+// dynamic texture (treat texnum == 0 differently)
+#define GLTEXF_DYNAMIC         0x00080000
 
 typedef struct textypeinfo_s
 {
@@ -80,6 +82,13 @@ typedef struct gltexture_s
        // (must be identical in rtexture_t)
        int texnum; // GL texture slot number
 
+       // dynamic texture stuff [11/22/2007 Black]
+       // used to hold the texture number of dirty textures   
+       int dirtytexnum;
+       updatecallback_t updatecallback;
+       void *updatacallback_data;
+       // --- [11/22/2007 Black]
+
        // pointer to texturepool (check this to see if the texture is allocated)
        struct gltexturepool_s *pool;
        // pointer to next texture in texturepool chain
@@ -206,6 +215,34 @@ static textypeinfo_t *R_GetTexTypeInfo(int textype, int flags)
        return NULL; // this line only to hush compiler warnings
 }
 
+// dynamic texture code [11/22/2007 Black]
+void R_MarkDirtyTexture(rtexture_t *rt) {
+       gltexture_t *glt = (gltexture_t*) rt;
+       // dont do anything if the texture is already dirty (and make sure this *is* a dynamic texture after all!)
+       if( !glt->dirtytexnum && glt->flags & GLTEXF_DYNAMIC ) {
+               glt->dirtytexnum = glt->texnum;
+               // mark it as dirty, so R_RealGetTexture gets called
+               glt->texnum = 0;
+       }
+}
+
+void R_MakeTextureDynamic(rtexture_t *rt, updatecallback_t updatecallback, void *data) {
+       gltexture_t *glt = (gltexture_t*) rt;
+       glt->flags |= GLTEXF_DYNAMIC;
+       glt->updatecallback = updatecallback;
+       glt->updatacallback_data = data;
+}
+
+static void R_UpdateDynamicTexture(gltexture_t *glt) {
+       glt->texnum = glt->dirtytexnum;
+       // reset dirtytexnum again (not dirty anymore)
+       glt->dirtytexnum = 0;
+       // TODO: now assert that t->texnum != 0 ?
+       if( glt->updatecallback ) {
+               glt->updatecallback( (rtexture_t*) glt, glt->updatacallback_data );
+       }
+}
+
 static void R_UploadTexture(gltexture_t *t);
 
 static void R_PrecacheTexture(gltexture_t *glt)
@@ -232,6 +269,9 @@ int R_RealGetTexture(rtexture_t *rt)
                glt = (gltexture_t *)rt;
                if (glt->flags & GLTEXF_UPLOAD)
                        R_UploadTexture(glt);
+               if (glt->flags & GLTEXF_DYNAMIC)
+                       R_UpdateDynamicTexture(glt);
+
                return glt->texnum;
        }
        else
@@ -996,6 +1036,10 @@ static rtexture_t *R_SetupTexture(rtexturepool_t *rtexturepool, const char *iden
        glt->bytesperpixel = texinfo->internalbytesperpixel;
        glt->sides = glt->texturetype == GLTEXTURETYPE_CUBEMAP ? 6 : 1;
        glt->texnum = -1;
+       // init the dynamic texture attributes, too [11/22/2007 Black]
+       glt->dirtytexnum = 0;
+       glt->updatecallback = NULL;
+       glt->updatacallback_data = NULL;
 
        if (data)
        {

diff --git a/r_textures.h b/r_textures.h
index 0cef25500d0513efd6407ec7f625bd23bdf879c2..51978f81f88fd6a78acfc9e13ae34412155c6ad9 100644 (file)
--- a/r_textures.h
+++ b/r_textures.h
@@ -45,6 +45,8 @@ typedef struct rtexturepool_s
 }
 rtexturepool_t;
 
+typedef void (*updatecallback_t)(rtexture_t *rt, void *data);
+
 // allocate a texture pool, to be used with R_LoadTexture
 rtexturepool_t *R_AllocTexturePool(void);
 // free a texture pool (textures can not be freed individually)
@@ -94,5 +96,9 @@ int R_TextureHeight(rtexture_t *rt);
 // frees processing buffers each frame, and may someday animate procedural textures
 void R_Textures_Frame(void);
 
+// maybe rename this - sounds awful? [11/21/2007 Black]
+void R_MarkDirtyTexture(rtexture_t *rt);
+void R_MakeTextureDynamic(rtexture_t *rt, updatecallback_t updatecallback, void *data); 
+
 #endif