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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/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:
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;
}
}
/**
* Returns a generic GL type from an internal format, so that it can be used
* together with the base format to obtain a mesa_format by calling
* mesa_format_from_format_and_type().
*/
static GLenum
get_generic_type_for_internal_format(GLenum internalFormat)
{
if (_mesa_is_color_format(internalFormat)) {
if (_mesa_is_enum_format_unsigned_int(internalFormat))
return GL_UNSIGNED_BYTE;
else if (_mesa_is_enum_format_signed_int(internalFormat))
return GL_BYTE;
} else {
switch (internalFormat) {
case GL_STENCIL_INDEX:
case GL_STENCIL_INDEX8:
return GL_UNSIGNED_BYTE;
case GL_DEPTH_COMPONENT:
case GL_DEPTH_COMPONENT16:
return GL_UNSIGNED_SHORT;
case GL_DEPTH_COMPONENT24:
case GL_DEPTH_COMPONENT32:
return GL_UNSIGNED_INT;
case GL_DEPTH_COMPONENT32F:
return GL_FLOAT;
case GL_DEPTH_STENCIL:
case GL_DEPTH24_STENCIL8:
return GL_UNSIGNED_INT_24_8;
case GL_DEPTH32F_STENCIL8:
return GL_FLOAT_32_UNSIGNED_INT_24_8_REV;
default:
/* fall-through */
break;
}
}
return GL_FLOAT;
}
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;
}
case GL_INTERNALFORMAT_PREFERRED: {
params[0] = GL_NONE;
/* We need to resolve an internal format that is compatible with
* the passed internal format, and optimal to the driver. By now,
* we just validate that the passed internal format is supported by
* the driver, and if so return the same internal format, otherwise
* return GL_NONE.
*
* For validating the internal format, we use the
* ctx->TextureFormatSupported map to check that a BRW surface format
* exists, that can be derived from the internal format. But this
* expects a mesa_format, not an internal format. So we need to "come up"
* with a type that is generic enough, to resolve the mesa_format first.
*/
GLenum type = get_generic_type_for_internal_format(internalFormat);
/* Get a mesa_format from the internal format and type. */
GLint base_format = _mesa_base_tex_format(ctx, internalFormat);
if (base_format != -1) {
mesa_format mesa_format =
_mesa_format_from_format_and_type(base_format, type);
if (mesa_format < MESA_FORMAT_COUNT &&
ctx->TextureFormatSupported[mesa_format]) {
params[0] = internalFormat;
}
}
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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