gallium: Redefine the max texture 2d cap from _LEVELS to _SIZE.

The _LEVELS assumes that the max is always power of two.  For V3D 4.2, we
can support up to 7680 non-power-of-two MSAA textures, which will let X11
support dual 4k displays on newer hardware.

Reviewed-by: Marek Olšák <[email protected]>

22 files changed, 59 insertions, 47 deletions

diff --git a/src/gallium/drivers/etnaviv/etnaviv_screen.c b/src/gallium/drivers/etnaviv/etnaviv_screen.c
index 62b6f1c80fa..ce3147a7011 100644
--- a/src/gallium/drivers/etnaviv/etnaviv_screen.c
+++ b/src/gallium/drivers/etnaviv/etnaviv_screen.c
@@ -318,7 +318,8 @@ etna_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
       return 255;
 
    /* Texturing. */
-   case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
+   case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
+      return screen->specs.max_texture_size;
    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
    {
       int log2_max_tex_size = util_last_bit(screen->specs.max_texture_size);
diff --git a/src/gallium/drivers/freedreno/freedreno_screen.c b/src/gallium/drivers/freedreno/freedreno_screen.c
index 889737ae30c..0ec0ad996dc 100644
--- a/src/gallium/drivers/freedreno/freedreno_screen.c
+++ b/src/gallium/drivers/freedreno/freedreno_screen.c
@@ -371,7 +371,8 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 		return 0;
 
 	/* Texturing. */
-	case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
+	case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
+		return 1 << (MAX_MIP_LEVELS - 1);
 	case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
 		return MAX_MIP_LEVELS;
 	case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
diff --git a/src/gallium/drivers/i915/i915_screen.c b/src/gallium/drivers/i915/i915_screen.c
index 78707c66e62..d95b0696845 100644
--- a/src/gallium/drivers/i915/i915_screen.c
+++ b/src/gallium/drivers/i915/i915_screen.c
@@ -365,12 +365,12 @@ i915_get_param(struct pipe_screen *screen, enum pipe_cap cap)
       return is->debug.lie ? 1 : 0;
 
    /* Texturing. */
-   case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
-      return I915_MAX_TEXTURE_2D_LEVELS;
+   case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
+      return 1 << (I915_MAX_TEXTURE_2D_LEVELS - 1);
    case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
       return I915_MAX_TEXTURE_3D_LEVELS;
    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
-      return I915_MAX_TEXTURE_2D_LEVELS;
+      return 1 << (I915_MAX_TEXTURE_2D_LEVELS - 1);
    case PIPE_CAP_MIN_TEXEL_OFFSET:
    case PIPE_CAP_MAX_TEXEL_OFFSET:
    case PIPE_CAP_MIN_TEXTURE_GATHER_OFFSET:
diff --git a/src/gallium/drivers/iris/iris_screen.c b/src/gallium/drivers/iris/iris_screen.c
index 4fd3e040a45..e01fd1b74aa 100644
--- a/src/gallium/drivers/iris/iris_screen.c
+++ b/src/gallium/drivers/iris/iris_screen.c
@@ -202,7 +202,8 @@ iris_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
       return 1;
    case PIPE_CAP_MAX_RENDER_TARGETS:
       return BRW_MAX_DRAW_BUFFERS;
-   case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
+   case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
+      return 16384;
    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
       return IRIS_MAX_MIPLEVELS; /* 16384x16384 */
    case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
diff --git a/src/gallium/drivers/lima/lima_screen.c b/src/gallium/drivers/lima/lima_screen.c
index 31478c76f34..7cced495696 100644
--- a/src/gallium/drivers/lima/lima_screen.c
+++ b/src/gallium/drivers/lima/lima_screen.c
@@ -119,7 +119,8 @@ lima_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
       return 1;
 
-   case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
+   case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
+      return 1 << (LIMA_MAX_MIP_LEVELS - 1);
    case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
       return LIMA_MAX_MIP_LEVELS;
diff --git a/src/gallium/drivers/llvmpipe/lp_screen.c b/src/gallium/drivers/llvmpipe/lp_screen.c
index 510346d2abf..551d71e00e0 100644
--- a/src/gallium/drivers/llvmpipe/lp_screen.c
+++ b/src/gallium/drivers/llvmpipe/lp_screen.c
@@ -140,8 +140,8 @@ llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TEXTURE_BORDER_COLOR_QUIRK:
    case PIPE_CAP_MAX_TEXTURE_UPLOAD_MEMORY_BUDGET:
       return 0;
-   case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
-      return LP_MAX_TEXTURE_2D_LEVELS;
+   case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
+      return 1 << (LP_MAX_TEXTURE_2D_LEVELS - 1);
    case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
       return LP_MAX_TEXTURE_3D_LEVELS;
    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
diff --git a/src/gallium/drivers/nouveau/nv30/nv30_screen.c b/src/gallium/drivers/nouveau/nv30/nv30_screen.c
index b5dc033bd2d..a65e4d57903 100644
--- a/src/gallium/drivers/nouveau/nv30/nv30_screen.c
+++ b/src/gallium/drivers/nouveau/nv30/nv30_screen.c
@@ -58,8 +58,8 @@ nv30_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    /* non-boolean capabilities */
    case PIPE_CAP_MAX_RENDER_TARGETS:
       return (eng3d->oclass >= NV40_3D_CLASS) ? 4 : 1;
-   case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
-      return 13;
+   case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
+      return 4096;
    case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
       return 10;
    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
diff --git a/src/gallium/drivers/nouveau/nv50/nv50_screen.c b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
index 6c865d75f6d..e1cf4485ff7 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_screen.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
@@ -94,8 +94,8 @@ nv50_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 
    switch (param) {
    /* non-boolean caps */
-   case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
-      return 14;
+   case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
+      return 8192;
    case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
       return 12;
    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
index fe80c7e9103..5c2d50ef559 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
@@ -112,7 +112,8 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 
    switch (param) {
    /* non-boolean caps */
-   case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
+   case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
+      return 16384;
    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
       return 15;
    case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
diff --git a/src/gallium/drivers/panfrost/pan_screen.c b/src/gallium/drivers/panfrost/pan_screen.c
index 10e9ee21576..b24bdffc2da 100644
--- a/src/gallium/drivers/panfrost/pan_screen.c
+++ b/src/gallium/drivers/panfrost/pan_screen.c
@@ -117,7 +117,8 @@ panfrost_get_param(struct pipe_screen *screen, enum pipe_cap param)
         case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
                 return 1;
 
-        case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
+        case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
+                return 4096;
         case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
         case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
                 return 13;
diff --git a/src/gallium/drivers/r300/r300_screen.c b/src/gallium/drivers/r300/r300_screen.c
index be0b475e5ef..5c1d37eef6c 100644
--- a/src/gallium/drivers/r300/r300_screen.c
+++ b/src/gallium/drivers/r300/r300_screen.c
@@ -286,7 +286,8 @@ static int r300_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
             return 0;
 
         /* Texturing. */
-        case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
+        case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
+            return is_r500 ? 4096 : 2048;
         case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
         case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
             /* 13 == 4096, 12 == 2048 */
diff --git a/src/gallium/drivers/r600/r600_pipe.c b/src/gallium/drivers/r600/r600_pipe.c
index 41a878ab9d2..5c915e0f91a 100644
--- a/src/gallium/drivers/r600/r600_pipe.c
+++ b/src/gallium/drivers/r600/r600_pipe.c
@@ -497,7 +497,11 @@ static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 		return 2048;
 
 	/* Texturing. */
-	case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
+	case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
+		if (family >= CHIP_CEDAR)
+			return 16384;
+		else
+			return 8192;
 	case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
 		if (family >= CHIP_CEDAR)
 			return 15;
diff --git a/src/gallium/drivers/r600/r600_test_dma.c b/src/gallium/drivers/r600/r600_test_dma.c
index af86ad386f6..512e7742021 100644
--- a/src/gallium/drivers/r600/r600_test_dma.c
+++ b/src/gallium/drivers/r600/r600_test_dma.c
@@ -177,11 +177,10 @@ void r600_test_dma(struct r600_common_screen *rscreen)
 	struct pipe_context *ctx = screen->context_create(screen, NULL, 0);
 	struct r600_common_context *rctx = (struct r600_common_context*)ctx;
 	uint64_t max_alloc_size;
-	unsigned i, iterations, num_partial_copies, max_levels, max_tex_side;
+	unsigned i, iterations, num_partial_copies, max_tex_side;
 	unsigned num_pass = 0, num_fail = 0;
 
-	max_levels = screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS);
-	max_tex_side = 1 << (max_levels - 1);
+	max_tex_side = screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_SIZE);
 
 	/* Max 128 MB allowed for both textures. */
 	max_alloc_size = 128 * 1024 * 1024;
diff --git a/src/gallium/drivers/radeonsi/si_get.c b/src/gallium/drivers/radeonsi/si_get.c
index eb23d4fe88a..d97aca1de23 100644
--- a/src/gallium/drivers/radeonsi/si_get.c
+++ b/src/gallium/drivers/radeonsi/si_get.c
@@ -276,7 +276,8 @@ static int si_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 		return 2048;
 
 	/* Texturing. */
-	case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
+	case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
+		return 16384;
 	case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
 		return 15; /* 16384 */
 	case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
diff --git a/src/gallium/drivers/radeonsi/si_test_dma.c b/src/gallium/drivers/radeonsi/si_test_dma.c
index 7e396e671be..effdd9e82c1 100644
--- a/src/gallium/drivers/radeonsi/si_test_dma.c
+++ b/src/gallium/drivers/radeonsi/si_test_dma.c
@@ -192,11 +192,10 @@ void si_test_dma(struct si_screen *sscreen)
 	struct pipe_context *ctx = screen->context_create(screen, NULL, 0);
 	struct si_context *sctx = (struct si_context*)ctx;
 	uint64_t max_alloc_size;
-	unsigned i, iterations, num_partial_copies, max_levels, max_tex_side;
+	unsigned i, iterations, num_partial_copies, max_tex_side;
 	unsigned num_pass = 0, num_fail = 0;
 
-	max_levels = screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS);
-	max_tex_side = 1 << (max_levels - 1);
+	max_tex_side = screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_SIZE);
 
 	/* Max 128 MB allowed for both textures. */
 	max_alloc_size = 128 * 1024 * 1024;
diff --git a/src/gallium/drivers/softpipe/sp_screen.c b/src/gallium/drivers/softpipe/sp_screen.c
index 5d44824e202..b1b777b4755 100644
--- a/src/gallium/drivers/softpipe/sp_screen.c
+++ b/src/gallium/drivers/softpipe/sp_screen.c
@@ -95,8 +95,8 @@ softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TEXTURE_BORDER_COLOR_QUIRK:
    case PIPE_CAP_MAX_TEXTURE_UPLOAD_MEMORY_BUDGET:
       return 0;
-   case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
-      return SP_MAX_TEXTURE_2D_LEVELS;
+   case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
+      return 1 << (SP_MAX_TEXTURE_2D_LEVELS - 1);
    case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
       return SP_MAX_TEXTURE_3D_LEVELS;
    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
diff --git a/src/gallium/drivers/softpipe/sp_tile_cache.c b/src/gallium/drivers/softpipe/sp_tile_cache.c
index 998939bdf30..075d322f802 100644
--- a/src/gallium/drivers/softpipe/sp_tile_cache.c
+++ b/src/gallium/drivers/softpipe/sp_tile_cache.c
@@ -92,13 +92,10 @@ sp_create_tile_cache( struct pipe_context *pipe )
 {
    struct softpipe_tile_cache *tc;
    uint pos;
-   MAYBE_UNUSED int maxTexSize;
-   int maxLevels;
 
    /* sanity checking: max sure MAX_WIDTH/HEIGHT >= largest texture image */
-   maxLevels = pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS);
-   maxTexSize = 1 << (maxLevels - 1);
-   assert(MAX_WIDTH >= maxTexSize);
+   assert(MAX_WIDTH >= pipe->screen->get_param(pipe->screen,
+                                               PIPE_CAP_MAX_TEXTURE_2D_SIZE));
 
    STATIC_ASSERT(sizeof(union tile_address) == 4);
 
diff --git a/src/gallium/drivers/svga/svga_screen.c b/src/gallium/drivers/svga/svga_screen.c
index f747ff78bcf..02c1a99b2db 100644
--- a/src/gallium/drivers/svga/svga_screen.c
+++ b/src/gallium/drivers/svga/svga_screen.c
@@ -221,18 +221,18 @@ svga_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
       return 256;
 
-   case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
+   case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
       {
-         unsigned levels = SVGA_MAX_TEXTURE_LEVELS;
+         unsigned size = 1 << (SVGA_MAX_TEXTURE_LEVELS - 1);
          if (sws->get_cap(sws, SVGA3D_DEVCAP_MAX_TEXTURE_WIDTH, &result))
-            levels = MIN2(util_logbase2(result.u) + 1, levels);
+            size = MIN2(result.u, size);
          else
-            levels = 12 /* 2048x2048 */;
+            size = 2048;
          if (sws->get_cap(sws, SVGA3D_DEVCAP_MAX_TEXTURE_HEIGHT, &result))
-            levels = MIN2(util_logbase2(result.u) + 1, levels);
+            size = MIN2(result.u, size);
          else
-            levels = 12 /* 2048x2048 */;
-         return levels;
+            size = 2048;
+         return size;
       }
 
    case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
@@ -245,7 +245,7 @@ svga_get_param(struct pipe_screen *screen, enum pipe_cap param)
        * No mechanism to query the host, and at least limited to 2048x2048 on
        * certain hardware.
        */
-      return MIN2(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS),
+      return MIN2(util_last_bit(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_SIZE)),
                   12 /* 2048x2048 */);
 
    case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS:
diff --git a/src/gallium/drivers/swr/swr_screen.cpp b/src/gallium/drivers/swr/swr_screen.cpp
index 3a2a6133127..0b1347793f5 100644
--- a/src/gallium/drivers/swr/swr_screen.cpp
+++ b/src/gallium/drivers/swr/swr_screen.cpp
@@ -52,7 +52,7 @@
  * XXX Check max texture size values against core and sampler.
  */
 #define SWR_MAX_TEXTURE_SIZE (2 * 1024 * 1024 * 1024ULL) /* 2GB */
-#define SWR_MAX_TEXTURE_2D_LEVELS 14  /* 8K x 8K for now */
+#define SWR_MAX_TEXTURE_2D_SIZE 8192
 #define SWR_MAX_TEXTURE_3D_LEVELS 12  /* 2K x 2K x 2K for now */
 #define SWR_MAX_TEXTURE_CUBE_LEVELS 14  /* 8K x 8K for now */
 #define SWR_MAX_TEXTURE_ARRAY_LAYERS 512 /* 8K x 512 / 8K x 8K x 512 */
@@ -162,8 +162,8 @@ swr_get_param(struct pipe_screen *screen, enum pipe_cap param)
       /* limits */
    case PIPE_CAP_MAX_RENDER_TARGETS:
       return PIPE_MAX_COLOR_BUFS;
-   case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
-      return SWR_MAX_TEXTURE_2D_LEVELS;
+   case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
+      return SWR_MAX_TEXTURE_2D_SIZE;
    case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
       return SWR_MAX_TEXTURE_3D_LEVELS;
    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
diff --git a/src/gallium/drivers/v3d/v3d_screen.c b/src/gallium/drivers/v3d/v3d_screen.c
index 6a2dc15179d..e902be05474 100644
--- a/src/gallium/drivers/v3d/v3d_screen.c
+++ b/src/gallium/drivers/v3d/v3d_screen.c
@@ -205,7 +205,11 @@ v3d_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
                 return V3D_MAX_FS_INPUTS / 4;
 
                 /* Texturing. */
-        case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
+        case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
+                if (screen->devinfo.ver < 40)
+                        return 2048;
+                else
+                        return 4096;
         case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
         case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
                 if (screen->devinfo.ver < 40)
diff --git a/src/gallium/drivers/vc4/vc4_screen.c b/src/gallium/drivers/vc4/vc4_screen.c
index 5fc8c35f8a9..a9441d7ceb0 100644
--- a/src/gallium/drivers/vc4/vc4_screen.c
+++ b/src/gallium/drivers/vc4/vc4_screen.c
@@ -171,7 +171,8 @@ vc4_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
                 return 1;
 
                 /* Texturing. */
-        case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
+        case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
+                return 2048;
         case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
                 return VC4_MAX_MIP_LEVELS;
         case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
diff --git a/src/gallium/drivers/virgl/virgl_screen.c b/src/gallium/drivers/virgl/virgl_screen.c
index 65106dbb616..66cb6b7a219 100644
--- a/src/gallium/drivers/virgl/virgl_screen.c
+++ b/src/gallium/drivers/virgl/virgl_screen.c
@@ -82,10 +82,10 @@ virgl_get_param(struct pipe_screen *screen, enum pipe_cap param)
       return vscreen->caps.caps.v1.bset.mirror_clamp;
    case PIPE_CAP_TEXTURE_SWIZZLE:
       return 1;
-   case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
+   case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
       if (vscreen->caps.caps.v2.max_texture_2d_size)
-         return 1 + util_logbase2(vscreen->caps.caps.v2.max_texture_2d_size);
-      return 15; /* 16K x 16K */
+         return vscreen->caps.caps.v2.max_texture_2d_size;
+      return 16384;
    case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
       if (vscreen->caps.caps.v2.max_texture_3d_size)
          return 1 + util_logbase2(vscreen->caps.caps.v2.max_texture_3d_size);