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/*
* Copyright © 2015 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 "brw_context.h"
#include "brw_state.h"
#include "main/context.h"
#include "main/formatquery.h"
#include "main/glformats.h"
static size_t
brw_query_samples_for_format(struct gl_context *ctx, GLenum target,
GLenum internalFormat, int samples[16])
{
struct brw_context *brw = brw_context(ctx);
(void) target;
(void) internalFormat;
switch (brw->gen) {
case 9:
samples[0] = 16;
samples[1] = 8;
samples[2] = 4;
samples[3] = 2;
return 4;
case 8:
samples[0] = 8;
samples[1] = 4;
samples[2] = 2;
return 3;
case 7:
if (internalFormat == GL_RGBA32F && _mesa_is_gles(ctx)) {
/* For GLES, we are allowed to return a smaller number of samples for
* GL_RGBA32F. See OpenGLES 3.2 spec, section 20.3.1 Internal Format
* Query Parameters, under SAMPLES:
*
* "A value less than or equal to the value of MAX_SAMPLES, if
* internalformat is RGBA16F, R32F, RG32F, or RGBA32F."
*
* In brw_render_target_supported, we prevent formats with a size
* greater than 8 bytes from using 8x MSAA on gen7.
*/
samples[0] = 4;
return 1;
} else {
samples[0] = 8;
samples[1] = 4;
return 2;
}
case 6:
samples[0] = 4;
return 1;
default:
assert(brw->gen < 6);
samples[0] = 1;
return 1;
}
}
void
brw_query_internal_format(struct gl_context *ctx, GLenum target,
GLenum internalFormat, GLenum pname, GLint *params)
{
/* The Mesa layer gives us a temporary params buffer that is guaranteed
* to be non-NULL, and have at least 16 elements.
*/
assert(params != NULL);
switch (pname) {
case GL_SAMPLES:
brw_query_samples_for_format(ctx, target, internalFormat, params);
break;
case GL_NUM_SAMPLE_COUNTS: {
size_t num_samples;
GLint dummy_buffer[16];
num_samples = brw_query_samples_for_format(ctx, target, internalFormat,
dummy_buffer);
params[0] = (GLint) num_samples;
break;
}
default:
/* By default, we call the driver hook's fallback function from the frontend,
* which has generic implementation for all pnames.
*/
_mesa_query_internal_format_default(ctx, target, internalFormat, pname,
params);
break;
}
}
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