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/*
* Mesa 3-D graphics library
*
* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
* Copyright (C) 1999-2013 VMware, Inc. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* glGenerateMipmap function
*/
#include "context.h"
#include "enums.h"
#include "genmipmap.h"
#include "glformats.h"
#include "macros.h"
#include "mtypes.h"
#include "teximage.h"
#include "texobj.h"
#include "hash.h"
bool
_mesa_is_valid_generate_texture_mipmap_target(struct gl_context *ctx,
GLenum target)
{
bool error;
switch (target) {
case GL_TEXTURE_1D:
error = _mesa_is_gles(ctx);
break;
case GL_TEXTURE_2D:
error = false;
break;
case GL_TEXTURE_3D:
error = ctx->API == API_OPENGLES;
break;
case GL_TEXTURE_CUBE_MAP:
error = !ctx->Extensions.ARB_texture_cube_map;
break;
case GL_TEXTURE_1D_ARRAY:
error = _mesa_is_gles(ctx) || !ctx->Extensions.EXT_texture_array;
break;
case GL_TEXTURE_2D_ARRAY:
error = (_mesa_is_gles(ctx) && ctx->Version < 30)
|| !ctx->Extensions.EXT_texture_array;
break;
case GL_TEXTURE_CUBE_MAP_ARRAY:
error = !_mesa_has_texture_cube_map_array(ctx);
break;
default:
error = true;
}
return !error;
}
bool
_mesa_is_valid_generate_texture_mipmap_internalformat(struct gl_context *ctx,
GLenum internalformat)
{
if (_mesa_is_gles3(ctx)) {
/* From the ES 3.2 specification's description of GenerateMipmap():
* "An INVALID_OPERATION error is generated if the levelbase array was
* not specified with an unsized internal format from table 8.3 or a
* sized internal format that is both color-renderable and
* texture-filterable according to table 8.10."
*
* GL_EXT_texture_format_BGRA8888 adds a GL_BGRA_EXT unsized internal
* format, and includes it in a very similar looking table. So we
* include it here as well.
*/
return internalformat == GL_RGBA || internalformat == GL_RGB ||
internalformat == GL_LUMINANCE_ALPHA ||
internalformat == GL_LUMINANCE || internalformat == GL_ALPHA ||
internalformat == GL_BGRA_EXT ||
(_mesa_is_es3_color_renderable(internalformat) &&
_mesa_is_es3_texture_filterable(ctx, internalformat));
}
return (!_mesa_is_enum_format_integer(internalformat) &&
!_mesa_is_depthstencil_format(internalformat) &&
!_mesa_is_astc_format(internalformat) &&
!_mesa_is_stencil_format(internalformat));
}
/**
* Implements glGenerateMipmap and glGenerateTextureMipmap.
* Generates all the mipmap levels below the base level.
*/
void
_mesa_generate_texture_mipmap(struct gl_context *ctx,
struct gl_texture_object *texObj, GLenum target,
bool dsa)
{
struct gl_texture_image *srcImage;
const char *suffix = dsa ? "Texture" : "";
FLUSH_VERTICES(ctx, 0);
if (texObj->BaseLevel >= texObj->MaxLevel) {
/* nothing to do */
return;
}
if (texObj->Target == GL_TEXTURE_CUBE_MAP &&
!_mesa_cube_complete(texObj)) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glGenerate%sMipmap(incomplete cube map)", suffix);
return;
}
_mesa_lock_texture(ctx, texObj);
srcImage = _mesa_select_tex_image(texObj, target, texObj->BaseLevel);
if (!srcImage) {
_mesa_unlock_texture(ctx, texObj);
_mesa_error(ctx, GL_INVALID_OPERATION,
"glGenerate%sMipmap(zero size base image)", suffix);
return;
}
if (!_mesa_is_valid_generate_texture_mipmap_internalformat(ctx,
srcImage->InternalFormat)) {
_mesa_unlock_texture(ctx, texObj);
_mesa_error(ctx, GL_INVALID_OPERATION,
"glGenerate%sMipmap(invalid internal format %s)", suffix,
_mesa_enum_to_string(srcImage->InternalFormat));
return;
}
if (srcImage->Width == 0 || srcImage->Height == 0) {
_mesa_unlock_texture(ctx, texObj);
return;
}
if (target == GL_TEXTURE_CUBE_MAP) {
GLuint face;
for (face = 0; face < 6; face++) {
ctx->Driver.GenerateMipmap(ctx,
GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, texObj);
}
}
else {
ctx->Driver.GenerateMipmap(ctx, target, texObj);
}
_mesa_unlock_texture(ctx, texObj);
}
/**
* Generate all the mipmap levels below the base level.
* Note: this GL function would be more useful if one could specify a
* cube face, a set of array slices, etc.
*/
void GLAPIENTRY
_mesa_GenerateMipmap(GLenum target)
{
struct gl_texture_object *texObj;
GET_CURRENT_CONTEXT(ctx);
if (!_mesa_is_valid_generate_texture_mipmap_target(ctx, target)) {
_mesa_error(ctx, GL_INVALID_ENUM, "glGenerateMipmap(target=%s)",
_mesa_enum_to_string(target));
return;
}
texObj = _mesa_get_current_tex_object(ctx, target);
if (!texObj)
return;
_mesa_generate_texture_mipmap(ctx, texObj, target, false);
}
/**
* Generate all the mipmap levels below the base level.
*/
void GLAPIENTRY
_mesa_GenerateTextureMipmap(GLuint texture)
{
struct gl_texture_object *texObj;
GET_CURRENT_CONTEXT(ctx);
texObj = _mesa_lookup_texture_err(ctx, texture, "glGenerateTextureMipmap");
if (!texObj)
return;
if (!_mesa_is_valid_generate_texture_mipmap_target(ctx, texObj->Target)) {
_mesa_error(ctx, GL_INVALID_ENUM, "glGenerateTextureMipmap(target=%s)",
_mesa_enum_to_string(texObj->Target));
return;
}
_mesa_generate_texture_mipmap(ctx, texObj, texObj->Target, true);
}
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