mesa: Replace MaxTextureLevels with MaxTextureSize.

In most places (glGetInteger, max_legal_texture_dimensions), we wanted the
number of pixels, not the number of levels.  Number of levels is easily
recovered with util_next_power_of_two() and ffs().  More importantly, for
V3D we want to be able to expose a non-power-of-two maximum texture size
to cover 2x4k displays on HW that can't quite do 8192 wide.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/mesa/drivers/common/meta.c

@@ -1245,7 +1245,7 @@ init_temp_texture(struct gl_context *ctx, struct temp_texture *tex)
    else {
       /* use 2D texture, NPOT if possible */
       tex->Target = GL_TEXTURE_2D;
-      tex->MaxSize = 1 << (ctx->Const.MaxTextureLevels - 1);
+      tex->MaxSize = ctx->Const.MaxTextureSize;
       tex->NPOT = ctx->Extensions.ARB_texture_non_power_of_two;
    }
    tex->MinSize = 16;  /* 16 x 16 at least */

src/mesa/drivers/dri/i915/i830_context.c

@@ -104,7 +104,7 @@ i830CreateContext(int api,
    /* Advertise the full hardware capabilities.  The new memory
     * manager should cope much better with overload situations:
     */
-   ctx->Const.MaxTextureLevels = 12;
+   ctx->Const.MaxTextureSize = 2048;
    ctx->Const.Max3DTextureLevels = 9;
    ctx->Const.MaxCubeTextureLevels = 11;
    ctx->Const.MaxTextureRectSize = (1 << 11);

src/mesa/drivers/dri/i915/i915_context.c

@@ -214,7 +214,7 @@ i915CreateContext(int api,
    /* Advertise the full hardware capabilities.  The new memory
     * manager should cope much better with overload situations:
     */
-   ctx->Const.MaxTextureLevels = 12;
+   ctx->Const.MaxTextureSize = 2048;
    ctx->Const.Max3DTextureLevels = 9;
    ctx->Const.MaxCubeTextureLevels = 12;
    ctx->Const.MaxTextureRectSize = (1 << 11);

src/mesa/drivers/dri/i965/brw_context.c

@@ -477,11 +477,11 @@ brw_initialize_context_constants(struct brw_context *brw)
    ctx->Const.MaxImageUnits = MAX_IMAGE_UNITS;
    if (devinfo->gen >= 7) {
       ctx->Const.MaxRenderbufferSize = 16384;
-      ctx->Const.MaxTextureLevels = MIN2(15 /* 16384 */, MAX_TEXTURE_LEVELS);
+      ctx->Const.MaxTextureSize = 16384;
       ctx->Const.MaxCubeTextureLevels = 15; /* 16384 */
    } else {
       ctx->Const.MaxRenderbufferSize = 8192;
-      ctx->Const.MaxTextureLevels = MIN2(14 /* 8192 */, MAX_TEXTURE_LEVELS);
+      ctx->Const.MaxTextureSize = 8192;
       ctx->Const.MaxCubeTextureLevels = 14; /* 8192 */
    }
    ctx->Const.Max3DTextureLevels = 12; /* 2048 */

src/mesa/drivers/dri/nouveau/nv04_context.c

@@ -157,7 +157,7 @@ nv04_context_create(struct nouveau_screen *screen, gl_api api,
 		goto fail;
 
 	/* GL constants. */
-	ctx->Const.MaxTextureLevels = 11;
+	ctx->Const.MaxTextureSize = 1024;
 	ctx->Const.MaxTextureCoordUnits = NV04_TEXTURE_UNITS;
 	ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits = NV04_TEXTURE_UNITS;
 	ctx->Const.MaxTextureUnits = NV04_TEXTURE_UNITS;

src/mesa/drivers/dri/nouveau/nv10_context.c

@@ -455,7 +455,7 @@ nv10_context_create(struct nouveau_screen *screen, gl_api api,
 	ctx->Extensions.ANGLE_texture_compression_dxt = true;
 
 	/* GL constants. */
-	ctx->Const.MaxTextureLevels = 12;
+	ctx->Const.MaxTextureSize = 2048;
 	ctx->Const.MaxTextureCoordUnits = NV10_TEXTURE_UNITS;
 	ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits = NV10_TEXTURE_UNITS;
 	ctx->Const.MaxTextureUnits = NV10_TEXTURE_UNITS;

src/mesa/drivers/dri/r200/r200_context.c

@@ -268,7 +268,7 @@ GLboolean r200CreateContext( gl_api api,
 
    /* FIXME: When no memory manager is available we should set this 
     * to some reasonable value based on texture memory pool size */
-   ctx->Const.MaxTextureLevels = 12;
+   ctx->Const.MaxTextureSize = 2048;
    ctx->Const.Max3DTextureLevels = 9;
    ctx->Const.MaxCubeTextureLevels = 12;
    ctx->Const.MaxTextureRectSize = 2048;

src/mesa/drivers/dri/radeon/radeon_context.c

@@ -230,7 +230,7 @@ r100CreateContext( gl_api api,
 
    /* FIXME: When no memory manager is available we should set this 
     * to some reasonable value based on texture memory pool size */
-   ctx->Const.MaxTextureLevels = 12;
+   ctx->Const.MaxTextureSize = 2048;
    ctx->Const.Max3DTextureLevels = 9;
    ctx->Const.MaxCubeTextureLevels = 12;
    ctx->Const.MaxTextureRectSize = 2048;

src/mesa/drivers/dri/radeon/radeon_mipmap_tree.c

@@ -150,7 +150,7 @@ static void calculate_miptree_layout(radeonContextPtr rmesa, radeon_mipmap_tree
 {
 	GLuint curOffset, i, face, level;
 
-	assert(mt->numLevels <= rmesa->glCtx.Const.MaxTextureLevels);
+	assert(1 << (mt->numLevels - 1) <= rmesa->glCtx.Const.MaxTextureSize);
 
 	curOffset = 0;
 	for(face = 0; face < mt->faces; face++) {

src/mesa/main/context.c

@@ -555,7 +555,7 @@ _mesa_init_constants(struct gl_constants *consts, gl_api api)
 
    /* Constants, may be overriden (usually only reduced) by device drivers */
    consts->MaxTextureMbytes = MAX_TEXTURE_MBYTES;
-   consts->MaxTextureLevels = MAX_TEXTURE_LEVELS;
+   consts->MaxTextureSize = 1 << (MAX_TEXTURE_LEVELS - 1);
    consts->Max3DTextureLevels = MAX_3D_TEXTURE_LEVELS;
    consts->MaxCubeTextureLevels = MAX_CUBE_TEXTURE_LEVELS;
    consts->MaxTextureRectSize = MAX_TEXTURE_RECT_SIZE;
@@ -782,7 +782,7 @@ check_context_limits(struct gl_context *ctx)
 
 
    /* Texture size checks */
-   assert(ctx->Const.MaxTextureLevels <= MAX_TEXTURE_LEVELS);
+   assert(ctx->Const.MaxTextureSize <= (1 << (MAX_TEXTURE_LEVELS - 1)));
    assert(ctx->Const.Max3DTextureLevels <= MAX_3D_TEXTURE_LEVELS);
    assert(ctx->Const.MaxCubeTextureLevels <= MAX_CUBE_TEXTURE_LEVELS);
    assert(ctx->Const.MaxTextureRectSize <= MAX_TEXTURE_RECT_SIZE);
@@ -792,10 +792,8 @@ check_context_limits(struct gl_context *ctx)
    assert(MAX_TEXTURE_LEVELS >= MAX_CUBE_TEXTURE_LEVELS);
 
    /* Max texture size should be <= max viewport size (render to texture) */
-   assert((1U << (ctx->Const.MaxTextureLevels - 1))
-          <= ctx->Const.MaxViewportWidth);
-   assert((1U << (ctx->Const.MaxTextureLevels - 1))
-          <= ctx->Const.MaxViewportHeight);
+   assert(ctx->Const.MaxTextureSize <= ctx->Const.MaxViewportWidth);
+   assert(ctx->Const.MaxTextureSize <= ctx->Const.MaxViewportHeight);
 
    assert(ctx->Const.MaxDrawBuffers <= MAX_DRAW_BUFFERS);
 

src/mesa/main/get_hash_params.py

@@ -21,7 +21,7 @@
   [ "ALIASED_LINE_WIDTH_RANGE", "CONTEXT_FLOAT2(Const.MinLineWidth), NO_EXTRA" ],
   [ "MAX_ELEMENTS_VERTICES", "CONTEXT_INT(Const.MaxArrayLockSize), NO_EXTRA" ],
   [ "MAX_ELEMENTS_INDICES", "CONTEXT_INT(Const.MaxArrayLockSize), NO_EXTRA" ],
-  [ "MAX_TEXTURE_SIZE", "LOC_CUSTOM, TYPE_INT, offsetof(struct gl_context, Const.MaxTextureLevels), NO_EXTRA" ],
+  [ "MAX_TEXTURE_SIZE", "CONTEXT_INT(Const.MaxTextureSize), NO_EXTRA" ],
   [ "MAX_VIEWPORT_DIMS", "CONTEXT_INT2(Const.MaxViewportWidth), NO_EXTRA" ],
   [ "PACK_ALIGNMENT", "CONTEXT_INT(Pack.Alignment), NO_EXTRA" ],
   [ "ALIASED_POINT_SIZE_RANGE", "CONTEXT_FLOAT2(Const.MinPointSize), NO_EXTRA" ],

src/mesa/main/mtypes.h

@@ -3654,7 +3654,7 @@ struct gl_program_constants
 struct gl_constants
 {
    GLuint MaxTextureMbytes;      /**< Max memory per image, in MB */
-   GLuint MaxTextureLevels;      /**< Max mipmap levels. */
+   GLuint MaxTextureSize;        /**< Max 1D/2D texture size, in pixels*/
    GLuint Max3DTextureLevels;    /**< Max mipmap levels for 3D textures */
    GLuint MaxCubeTextureLevels;  /**< Max mipmap levels for cube textures */
    GLuint MaxArrayTextureLayers; /**< Max layers in array textures */

src/mesa/main/teximage.c

@@ -492,7 +492,7 @@ _mesa_max_texture_levels(const struct gl_context *ctx, GLenum target)
    case GL_PROXY_TEXTURE_1D:
    case GL_TEXTURE_2D:
    case GL_PROXY_TEXTURE_2D:
-      return ctx->Const.MaxTextureLevels;
+      return ffs(util_next_power_of_two(ctx->Const.MaxTextureSize));
    case GL_TEXTURE_3D:
    case GL_PROXY_TEXTURE_3D:
       return ctx->Const.Max3DTextureLevels;
@@ -514,7 +514,7 @@ _mesa_max_texture_levels(const struct gl_context *ctx, GLenum target)
    case GL_TEXTURE_2D_ARRAY_EXT:
    case GL_PROXY_TEXTURE_2D_ARRAY_EXT:
       return ctx->Extensions.EXT_texture_array
-         ? ctx->Const.MaxTextureLevels : 0;
+         ? ffs(util_next_power_of_two(ctx->Const.MaxTextureSize)) : 0;
    case GL_TEXTURE_CUBE_MAP_ARRAY:
    case GL_PROXY_TEXTURE_CUBE_MAP_ARRAY:
       return _mesa_has_texture_cube_map_array(ctx)
@@ -973,8 +973,7 @@ _mesa_legal_texture_dimensions(struct gl_context *ctx, GLenum target,
    switch (target) {
    case GL_TEXTURE_1D:
    case GL_PROXY_TEXTURE_1D:
-      maxSize = 1 << (ctx->Const.MaxTextureLevels - 1); /* level zero size */
-      maxSize >>= level;  /* level size */
+      maxSize = ctx->Const.MaxTextureSize >> level;
       if (width < 2 * border || width > 2 * border + maxSize)
          return GL_FALSE;
       if (!ctx->Extensions.ARB_texture_non_power_of_two) {
@@ -987,8 +986,7 @@ _mesa_legal_texture_dimensions(struct gl_context *ctx, GLenum target,
    case GL_PROXY_TEXTURE_2D:
    case GL_TEXTURE_2D_MULTISAMPLE:
    case GL_PROXY_TEXTURE_2D_MULTISAMPLE:
-      maxSize = 1 << (ctx->Const.MaxTextureLevels - 1);
-      maxSize >>= level;
+      maxSize = ctx->Const.MaxTextureSize >> level;
       if (width < 2 * border || width > 2 * border + maxSize)
          return GL_FALSE;
       if (height < 2 * border || height > 2 * border + maxSize)
@@ -1058,8 +1056,7 @@ _mesa_legal_texture_dimensions(struct gl_context *ctx, GLenum target,
 
    case GL_TEXTURE_1D_ARRAY_EXT:
    case GL_PROXY_TEXTURE_1D_ARRAY_EXT:
-      maxSize = 1 << (ctx->Const.MaxTextureLevels - 1);
-      maxSize >>= level;
+      maxSize = ctx->Const.MaxTextureSize >> level;
       if (width < 2 * border || width > 2 * border + maxSize)
          return GL_FALSE;
       if (height < 0 || height > ctx->Const.MaxArrayTextureLayers)
@@ -1074,8 +1071,7 @@ _mesa_legal_texture_dimensions(struct gl_context *ctx, GLenum target,
    case GL_PROXY_TEXTURE_2D_ARRAY_EXT:
    case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
    case GL_PROXY_TEXTURE_2D_MULTISAMPLE_ARRAY:
-      maxSize = 1 << (ctx->Const.MaxTextureLevels - 1);
-      maxSize >>= level;
+      maxSize = ctx->Const.MaxTextureSize >> level;
       if (width < 2 * border || width > 2 * border + maxSize)
          return GL_FALSE;
       if (height < 2 * border || height > 2 * border + maxSize)

src/mesa/state_tracker/st_extensions.c

@@ -84,9 +84,11 @@ void st_init_limits(struct pipe_screen *screen,
    bool can_ubo = true;
    int temp;
 
-   c->MaxTextureLevels
-      = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS),
-            MAX_TEXTURE_LEVELS);
+   int max_texture_levels =
+      _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS),
+           MAX_TEXTURE_LEVELS);
+
+   c->MaxTextureSize = 1 << (max_texture_levels - 1);
 
    c->Max3DTextureLevels
       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_3D_LEVELS),
@@ -96,8 +98,7 @@ void st_init_limits(struct pipe_screen *screen,
       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS),
             MAX_CUBE_TEXTURE_LEVELS);
 
-   c->MaxTextureRectSize
-      = _min(1 << (c->MaxTextureLevels - 1), MAX_TEXTURE_RECT_SIZE);
+   c->MaxTextureRectSize = _min(c->MaxTextureSize, MAX_TEXTURE_RECT_SIZE);
 
    c->MaxArrayTextureLayers
       = screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS);

src/mesa/swrast/s_context.c

@@ -728,7 +728,7 @@ _swrast_CreateContext( struct gl_context *ctx )
    assert(ctx->Const.MaxRenderbufferSize <= SWRAST_MAX_WIDTH);
 
    /* make sure largest texture image is <= SWRAST_MAX_WIDTH in size */
-   assert((1 << (ctx->Const.MaxTextureLevels - 1)) <= SWRAST_MAX_WIDTH);
+   assert(ctx->Const.MaxTextureSize <= SWRAST_MAX_WIDTH);
    assert((1 << (ctx->Const.MaxCubeTextureLevels - 1)) <= SWRAST_MAX_WIDTH);
    assert((1 << (ctx->Const.Max3DTextureLevels - 1)) <= SWRAST_MAX_WIDTH);