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/*
* Copyright © 2012 Intel Corporation
*
* 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 (including the next
* paragraph) 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.
*/
#include "mtypes.h"
#include "glformats.h"
#include "macros.h"
#include "mfeatures.h"
#include "enums.h"
#include "fbobject.h"
#include "formatquery.h"
void GLAPIENTRY
_mesa_GetInternalformativ(GLenum target, GLenum internalformat, GLenum pname,
GLsizei bufSize, GLint *params)
{
GLint buffer[16];
GLsizei count = 0;
GET_CURRENT_CONTEXT(ctx);
if (!ctx->Extensions.ARB_internalformat_query) {
_mesa_error(ctx, GL_INVALID_OPERATION, "glGetInternalformativ");
return;
}
assert(ctx->Driver.QuerySamplesForFormat != NULL);
/* The ARB_internalformat_query spec says:
*
* "If the <target> parameter to GetInternalformativ is not one of
* TEXTURE_2D_MULTISAMPLE, TEXTURE_2D_MULTISAMPLE_ARRAY or RENDERBUFFER
* then an INVALID_ENUM error is generated."
*/
switch (target) {
case GL_RENDERBUFFER:
break;
case GL_TEXTURE_2D_MULTISAMPLE:
case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
/* Mesa does not currently support GL_ARB_texture_multisample, so these
* enums are not valid on this implementation either.
*/
default:
_mesa_error(ctx, GL_INVALID_ENUM,
"glGetInternalformativ(target=%s)",
_mesa_lookup_enum_by_nr(target));
return;
}
/* The ARB_internalformat_query spec says:
*
* "If the <internalformat> parameter to GetInternalformativ is not
* color-, depth- or stencil-renderable, then an INVALID_ENUM error is
* generated."
*/
if (_mesa_base_fbo_format(ctx, internalformat) == 0) {
_mesa_error(ctx, GL_INVALID_ENUM,
"glGetInternalformativ(internalformat=%s)",
_mesa_lookup_enum_by_nr(internalformat));
return;
}
/* The ARB_internalformat_query spec says:
*
* "If the <bufSize> parameter to GetInternalformativ is negative, then
* an INVALID_VALUE error is generated."
*/
if (bufSize < 0) {
_mesa_error(ctx, GL_INVALID_VALUE,
"glGetInternalformativ(target=%s)",
_mesa_lookup_enum_by_nr(target));
return;
}
switch (pname) {
case GL_SAMPLES:
count = ctx->Driver.QuerySamplesForFormat(ctx, internalformat, buffer);
break;
case GL_NUM_SAMPLE_COUNTS: {
/* The driver can return 0, and we should pass that along to the
* application. The ARB decided that ARB_internalformat_query should
* behave as ARB_internalformat_query2 in this situation.
*
* The ARB_internalformat_query2 spec says:
*
* "- NUM_SAMPLE_COUNTS: The number of sample counts that would be
* returned by querying SAMPLES is returned in <params>.
* * If <internalformat> is not color-renderable,
* depth-renderable, or stencil-renderable (as defined in
* section 4.4.4), or if <target> does not support multiple
* samples (ie other than TEXTURE_2D_MULTISAMPLE,
* TEXTURE_2D_MULTISAMPLE_ARRAY, or RENDERBUFFER), 0 is
* returned."
*/
const size_t num_samples =
ctx->Driver.QuerySamplesForFormat(ctx, internalformat, buffer);
/* QuerySamplesForFormat writes some stuff to buffer, so we have to
* separately over-write it with the requested value.
*/
buffer[0] = (GLint) num_samples;
count = 1;
break;
}
default:
_mesa_error(ctx, GL_INVALID_ENUM,
"glGetInternalformativ(pname=%s)",
_mesa_lookup_enum_by_nr(pname));
return;
}
if (bufSize != 0 && params == NULL) {
/* Emit a warning to aid application debugging, but go ahead and do the
* memcpy (and probably crash) anyway.
*/
_mesa_warning(ctx,
"glGetInternalformativ(bufSize = %d, but params = NULL)",
bufSize);
}
/* Copy the data from the temporary buffer to the buffer supplied by the
* application. Clamp the size of the copy to the size supplied by the
* application.
*/
memcpy(params, buffer, MIN2(count, bufSize) * sizeof(GLint));
return;
}
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