/**************************************************************************
*
* Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
* Copyright (c) 2008-2010 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, sub license, 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 NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
*
**************************************************************************/
/**
* Mesa / Gallium format conversion and format selection code.
* \author Brian Paul
*/
#include "main/imports.h"
#include "main/context.h"
#include "main/texstore.h"
#include "main/enums.h"
#include "main/image.h"
#include "main/macros.h"
#include "pipe/p_context.h"
#include "pipe/p_defines.h"
#include "pipe/p_screen.h"
#include "util/u_format.h"
#include "st_context.h"
#include "st_format.h"
static GLuint
format_max_bits(enum pipe_format format)
{
GLuint size = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 0);
size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 1));
size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 2));
size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 3));
size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0));
size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1));
return size;
}
/**
* Return basic GL datatype for the given gallium format.
*/
GLenum
st_format_datatype(enum pipe_format format)
{
const struct util_format_description *desc;
desc = util_format_description(format);
assert(desc);
if (desc->layout == UTIL_FORMAT_LAYOUT_PLAIN) {
if (format == PIPE_FORMAT_B5G5R5A1_UNORM ||
format == PIPE_FORMAT_B5G6R5_UNORM) {
return GL_UNSIGNED_SHORT;
}
else if (format == PIPE_FORMAT_Z24_UNORM_S8_USCALED ||
format == PIPE_FORMAT_S8_USCALED_Z24_UNORM) {
return GL_UNSIGNED_INT_24_8;
}
else {
const GLuint size = format_max_bits(format);
if (size == 8) {
if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
return GL_UNSIGNED_BYTE;
else
return GL_BYTE;
}
else if (size == 16) {
if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
return GL_UNSIGNED_SHORT;
else
return GL_SHORT;
}
else {
assert( size <= 32 );
if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
return GL_UNSIGNED_INT;
else
return GL_INT;
}
}
}
else if (format == PIPE_FORMAT_UYVY) {
return GL_UNSIGNED_SHORT;
}
else if (format == PIPE_FORMAT_YUYV) {
return GL_UNSIGNED_SHORT;
}
else {
/* compressed format? */
assert(0);
}
assert(0);
return GL_NONE;
}
/**
* Translate Mesa format to Gallium format.
*/
enum pipe_format
st_mesa_format_to_pipe_format(gl_format mesaFormat)
{
switch (mesaFormat) {
case MESA_FORMAT_RGBA8888:
return PIPE_FORMAT_A8B8G8R8_UNORM;
case MESA_FORMAT_RGBA8888_REV:
return PIPE_FORMAT_R8G8B8A8_UNORM;
case MESA_FORMAT_ARGB8888:
return PIPE_FORMAT_B8G8R8A8_UNORM;
case MESA_FORMAT_ARGB8888_REV:
return PIPE_FORMAT_A8R8G8B8_UNORM;
case MESA_FORMAT_XRGB8888:
return PIPE_FORMAT_B8G8R8X8_UNORM;
case MESA_FORMAT_XRGB8888_REV:
return PIPE_FORMAT_X8R8G8B8_UNORM;
case MESA_FORMAT_ARGB1555:
return PIPE_FORMAT_B5G5R5A1_UNORM;
case MESA_FORMAT_ARGB4444:
return PIPE_FORMAT_B4G4R4A4_UNORM;
case MESA_FORMAT_RGB565:
return PIPE_FORMAT_B5G6R5_UNORM;
case MESA_FORMAT_AL88:
return PIPE_FORMAT_L8A8_UNORM;
case MESA_FORMAT_A8:
return PIPE_FORMAT_A8_UNORM;
case MESA_FORMAT_L8:
return PIPE_FORMAT_L8_UNORM;
case MESA_FORMAT_I8:
return PIPE_FORMAT_I8_UNORM;
case MESA_FORMAT_Z16:
return PIPE_FORMAT_Z16_UNORM;
case MESA_FORMAT_Z32:
return PIPE_FORMAT_Z32_UNORM;
case MESA_FORMAT_Z24_S8:
return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
case MESA_FORMAT_S8_Z24:
return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
case MESA_FORMAT_Z24_X8:
return PIPE_FORMAT_X8Z24_UNORM;
case MESA_FORMAT_X8_Z24:
return PIPE_FORMAT_Z24X8_UNORM;
case MESA_FORMAT_YCBCR:
return PIPE_FORMAT_UYVY;
#if FEATURE_texture_s3tc
case MESA_FORMAT_RGB_DXT1:
return PIPE_FORMAT_DXT1_RGB;
case MESA_FORMAT_RGBA_DXT1:
return PIPE_FORMAT_DXT1_RGBA;
case MESA_FORMAT_RGBA_DXT3:
return PIPE_FORMAT_DXT3_RGBA;
case MESA_FORMAT_RGBA_DXT5:
return PIPE_FORMAT_DXT5_RGBA;
#if FEATURE_EXT_texture_sRGB
case MESA_FORMAT_SRGB_DXT1:
return PIPE_FORMAT_DXT1_SRGB;
case MESA_FORMAT_SRGBA_DXT1:
return PIPE_FORMAT_DXT1_SRGBA;
case MESA_FORMAT_SRGBA_DXT3:
return PIPE_FORMAT_DXT3_SRGBA;
case MESA_FORMAT_SRGBA_DXT5:
return PIPE_FORMAT_DXT5_SRGBA;
#endif
#endif
#if FEATURE_EXT_texture_sRGB
case MESA_FORMAT_SLA8:
return PIPE_FORMAT_L8A8_SRGB;
case MESA_FORMAT_SL8:
return PIPE_FORMAT_L8_SRGB;
case MESA_FORMAT_SRGB8:
return PIPE_FORMAT_R8G8B8_SRGB;
case MESA_FORMAT_SRGBA8:
return PIPE_FORMAT_A8B8G8R8_SRGB;
case MESA_FORMAT_SARGB8:
return PIPE_FORMAT_B8G8R8A8_SRGB;
#endif
default:
assert(0);
return PIPE_FORMAT_NONE;
}
}
/**
* Translate Gallium format to Mesa format.
*/
gl_format
st_pipe_format_to_mesa_format(enum pipe_format format)
{
switch (format) {
case PIPE_FORMAT_A8B8G8R8_UNORM:
return MESA_FORMAT_RGBA8888;
case PIPE_FORMAT_R8G8B8A8_UNORM:
return MESA_FORMAT_RGBA8888_REV;
case PIPE_FORMAT_B8G8R8A8_UNORM:
return MESA_FORMAT_ARGB8888;
case PIPE_FORMAT_A8R8G8B8_UNORM:
return MESA_FORMAT_ARGB8888_REV;
case PIPE_FORMAT_B8G8R8X8_UNORM:
return MESA_FORMAT_XRGB8888;
case PIPE_FORMAT_X8R8G8B8_UNORM:
return MESA_FORMAT_XRGB8888_REV;
case PIPE_FORMAT_B5G5R5A1_UNORM:
return MESA_FORMAT_ARGB1555;
case PIPE_FORMAT_B4G4R4A4_UNORM:
return MESA_FORMAT_ARGB4444;
case PIPE_FORMAT_B5G6R5_UNORM:
return MESA_FORMAT_RGB565;
case PIPE_FORMAT_L8A8_UNORM:
return MESA_FORMAT_AL88;
case PIPE_FORMAT_A8_UNORM:
return MESA_FORMAT_A8;
case PIPE_FORMAT_L8_UNORM:
return MESA_FORMAT_L8;
case PIPE_FORMAT_I8_UNORM:
return MESA_FORMAT_I8;
case PIPE_FORMAT_S8_USCALED:
return MESA_FORMAT_S8;
case PIPE_FORMAT_R16G16B16A16_SNORM:
return MESA_FORMAT_SIGNED_RGBA_16;
case PIPE_FORMAT_Z16_UNORM:
return MESA_FORMAT_Z16;
case PIPE_FORMAT_Z32_UNORM:
return MESA_FORMAT_Z32;
case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
return MESA_FORMAT_Z24_S8;
case PIPE_FORMAT_X8Z24_UNORM:
return MESA_FORMAT_Z24_X8;
case PIPE_FORMAT_Z24X8_UNORM:
return MESA_FORMAT_X8_Z24;
case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
return MESA_FORMAT_S8_Z24;
case PIPE_FORMAT_UYVY:
return MESA_FORMAT_YCBCR;
case PIPE_FORMAT_YUYV:
return MESA_FORMAT_YCBCR_REV;
#if FEATURE_texture_s3tc
case PIPE_FORMAT_DXT1_RGB:
return MESA_FORMAT_RGB_DXT1;
case PIPE_FORMAT_DXT1_RGBA:
return MESA_FORMAT_RGBA_DXT1;
case PIPE_FORMAT_DXT3_RGBA:
return MESA_FORMAT_RGBA_DXT3;
case PIPE_FORMAT_DXT5_RGBA:
return MESA_FORMAT_RGBA_DXT5;
#if FEATURE_EXT_texture_sRGB
case PIPE_FORMAT_DXT1_SRGB:
return MESA_FORMAT_SRGB_DXT1;
case PIPE_FORMAT_DXT1_SRGBA:
return MESA_FORMAT_SRGBA_DXT1;
case PIPE_FORMAT_DXT3_SRGBA:
return MESA_FORMAT_SRGBA_DXT3;
case PIPE_FORMAT_DXT5_SRGBA:
return MESA_FORMAT_SRGBA_DXT5;
#endif
#endif
#if FEATURE_EXT_texture_sRGB
case PIPE_FORMAT_L8A8_SRGB:
return MESA_FORMAT_SLA8;
case PIPE_FORMAT_L8_SRGB:
return MESA_FORMAT_SL8;
case PIPE_FORMAT_R8G8B8_SRGB:
return MESA_FORMAT_SRGB8;
case PIPE_FORMAT_A8B8G8R8_SRGB:
return MESA_FORMAT_SRGBA8;
case PIPE_FORMAT_B8G8R8A8_SRGB:
return MESA_FORMAT_SARGB8;
#endif
default:
assert(0);
return MESA_FORMAT_NONE;
}
}
/**
* Return first supported format from the given list.
*/
static enum pipe_format
find_supported_format(struct pipe_screen *screen,
const enum pipe_format formats[],
uint num_formats,
enum pipe_texture_target target,
unsigned tex_usage,
unsigned geom_flags)
{
uint i;
for (i = 0; i < num_formats; i++) {
if (screen->is_format_supported(screen, formats[i], target,
tex_usage, geom_flags)) {
return formats[i];
}
}
return PIPE_FORMAT_NONE;
}
/**
* Find an RGBA format supported by the context/winsys.
*/
static enum pipe_format
default_rgba_format(struct pipe_screen *screen,
enum pipe_texture_target target,
unsigned tex_usage,
unsigned geom_flags)
{
static const enum pipe_format colorFormats[] = {
PIPE_FORMAT_B8G8R8A8_UNORM,
PIPE_FORMAT_A8R8G8B8_UNORM,
PIPE_FORMAT_A8B8G8R8_UNORM,
PIPE_FORMAT_B5G6R5_UNORM
};
return find_supported_format(screen, colorFormats, Elements(colorFormats),
target, tex_usage, geom_flags);
}
/**
* Find an RGB format supported by the context/winsys.
*/
static enum pipe_format
default_rgb_format(struct pipe_screen *screen,
enum pipe_texture_target target,
unsigned tex_usage,
unsigned geom_flags)
{
static const enum pipe_format colorFormats[] = {
PIPE_FORMAT_B8G8R8X8_UNORM,
PIPE_FORMAT_X8R8G8B8_UNORM,
PIPE_FORMAT_X8B8G8R8_UNORM,
PIPE_FORMAT_B8G8R8A8_UNORM,
PIPE_FORMAT_A8R8G8B8_UNORM,
PIPE_FORMAT_A8B8G8R8_UNORM,
PIPE_FORMAT_B5G6R5_UNORM
};
return find_supported_format(screen, colorFormats, Elements(colorFormats),
target, tex_usage, geom_flags);
}
/**
* Find an sRGBA format supported by the context/winsys.
*/
static enum pipe_format
default_srgba_format(struct pipe_screen *screen,
enum pipe_texture_target target,
unsigned tex_usage,
unsigned geom_flags)
{
static const enum pipe_format colorFormats[] = {
PIPE_FORMAT_B8G8R8A8_SRGB,
PIPE_FORMAT_A8R8G8B8_SRGB,
PIPE_FORMAT_A8B8G8R8_SRGB,
};
return find_supported_format(screen, colorFormats, Elements(colorFormats),
target, tex_usage, geom_flags);
}
/**
* Given an OpenGL internalFormat value for a texture or surface, return
* the best matching PIPE_FORMAT_x, or PIPE_FORMAT_NONE if there's no match.
* \param target one of PIPE_TEXTURE_x
* \param tex_usage either PIPE_BIND_RENDER_TARGET
* or PIPE_BIND_SAMPLER_VIEW
*/
enum pipe_format
st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
enum pipe_texture_target target, unsigned tex_usage)
{
unsigned geom_flags = 0;
switch (internalFormat) {
case 4:
case GL_RGBA:
case GL_COMPRESSED_RGBA:
case GL_RGBA8:
case GL_RGB10_A2:
case GL_RGBA12:
return default_rgba_format( screen, target, tex_usage, geom_flags );
case 3:
case GL_RGB:
case GL_COMPRESSED_RGB:
return default_rgb_format( screen, target, tex_usage, geom_flags );
case GL_RGBA16:
return default_rgba_format( screen, target, tex_usage, geom_flags );
case GL_RGBA4:
case GL_RGBA2:
if (screen->is_format_supported( screen, PIPE_FORMAT_B4G4R4A4_UNORM, target, tex_usage, geom_flags ))
return PIPE_FORMAT_B4G4R4A4_UNORM;
return default_rgba_format( screen, target, tex_usage, geom_flags );
case GL_RGB5_A1:
if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM, target, tex_usage, geom_flags ))
return PIPE_FORMAT_B5G5R5A1_UNORM;
return default_rgba_format( screen, target, tex_usage, geom_flags );
case GL_RGB8:
case GL_RGB10:
case GL_RGB12:
case GL_RGB16:
return default_rgb_format( screen, target, tex_usage, geom_flags );
case GL_RGB5:
case GL_RGB4:
case GL_R3_G3_B2:
if (screen->is_format_supported( screen, PIPE_FORMAT_B5G6R5_UNORM, target, tex_usage, geom_flags ))
return PIPE_FORMAT_B5G6R5_UNORM;
if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM, target, tex_usage, geom_flags ))
return PIPE_FORMAT_B5G5R5A1_UNORM;
return default_rgba_format( screen, target, tex_usage, geom_flags );
case GL_ALPHA:
case GL_ALPHA4:
case GL_ALPHA8:
case GL_ALPHA12:
case GL_ALPHA16:
case GL_COMPRESSED_ALPHA:
if (screen->is_format_supported( screen, PIPE_FORMAT_A8_UNORM, target, tex_usage, geom_flags ))
return PIPE_FORMAT_A8_UNORM;
return default_rgba_format( screen, target, tex_usage, geom_flags );
case 1:
case GL_LUMINANCE:
case GL_LUMINANCE4:
case GL_LUMINANCE8:
case GL_LUMINANCE12:
case GL_LUMINANCE16:
case GL_COMPRESSED_LUMINANCE:
if (screen->is_format_supported( screen, PIPE_FORMAT_L8_UNORM, target, tex_usage, geom_flags ))
return PIPE_FORMAT_L8_UNORM;
return default_rgba_format( screen, target, tex_usage, geom_flags );
case 2:
case GL_LUMINANCE_ALPHA:
case GL_LUMINANCE4_ALPHA4:
case GL_LUMINANCE6_ALPHA2:
case GL_LUMINANCE8_ALPHA8:
case GL_LUMINANCE12_ALPHA4:
case GL_LUMINANCE12_ALPHA12:
case GL_LUMINANCE16_ALPHA16:
case GL_COMPRESSED_LUMINANCE_ALPHA:
if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_UNORM, target, tex_usage, geom_flags ))
return PIPE_FORMAT_L8A8_UNORM;
return default_rgba_format( screen, target, tex_usage, geom_flags );
case GL_INTENSITY:
case GL_INTENSITY4:
case GL_INTENSITY8:
case GL_INTENSITY12:
case GL_INTENSITY16:
case GL_COMPRESSED_INTENSITY:
if (screen->is_format_supported( screen, PIPE_FORMAT_I8_UNORM, target, tex_usage, geom_flags ))
return PIPE_FORMAT_I8_UNORM;
return default_rgba_format( screen, target, tex_usage, geom_flags );
case GL_YCBCR_MESA:
if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY,
target, tex_usage, geom_flags)) {
return PIPE_FORMAT_UYVY;
}
if (screen->is_format_supported(screen, PIPE_FORMAT_YUYV,
target, tex_usage, geom_flags)) {
return PIPE_FORMAT_YUYV;
}
return PIPE_FORMAT_NONE;
case GL_RGB_S3TC:
case GL_RGB4_S3TC:
case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
return PIPE_FORMAT_DXT1_RGB;
case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
return PIPE_FORMAT_DXT1_RGBA;
case GL_RGBA_S3TC:
case GL_RGBA4_S3TC:
case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
return PIPE_FORMAT_DXT3_RGBA;
case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
return PIPE_FORMAT_DXT5_RGBA;
#if 0
case GL_COMPRESSED_RGB_FXT1_3DFX:
return PIPE_FORMAT_RGB_FXT1;
case GL_COMPRESSED_RGBA_FXT1_3DFX:
return PIPE_FORMAT_RGB_FXT1;
#endif
case GL_DEPTH_COMPONENT16:
if (screen->is_format_supported( screen, PIPE_FORMAT_Z16_UNORM, target, tex_usage, geom_flags ))
return PIPE_FORMAT_Z16_UNORM;
/* fall-through */
case GL_DEPTH_COMPONENT24:
if (screen->is_format_supported( screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED, target, tex_usage, geom_flags ))
return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
if (screen->is_format_supported( screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM, target, tex_usage, geom_flags ))
return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
/* fall-through */
case GL_DEPTH_COMPONENT32:
if (screen->is_format_supported( screen, PIPE_FORMAT_Z32_UNORM, target, tex_usage, geom_flags ))
return PIPE_FORMAT_Z32_UNORM;
/* fall-through */
case GL_DEPTH_COMPONENT:
{
static const enum pipe_format formats[] = {
PIPE_FORMAT_Z16_UNORM,
PIPE_FORMAT_Z32_UNORM,
PIPE_FORMAT_Z24_UNORM_S8_USCALED,
PIPE_FORMAT_S8_USCALED_Z24_UNORM
};
return find_supported_format(screen, formats, Elements(formats),
target, tex_usage, geom_flags);
}
case GL_STENCIL_INDEX:
case GL_STENCIL_INDEX1_EXT:
case GL_STENCIL_INDEX4_EXT:
case GL_STENCIL_INDEX8_EXT:
case GL_STENCIL_INDEX16_EXT:
{
static const enum pipe_format formats[] = {
PIPE_FORMAT_S8_USCALED,
PIPE_FORMAT_Z24_UNORM_S8_USCALED,
PIPE_FORMAT_S8_USCALED_Z24_UNORM
};
return find_supported_format(screen, formats, Elements(formats),
target, tex_usage, geom_flags);
}
case GL_DEPTH_STENCIL_EXT:
case GL_DEPTH24_STENCIL8_EXT:
{
static const enum pipe_format formats[] = {
PIPE_FORMAT_Z24_UNORM_S8_USCALED,
PIPE_FORMAT_S8_USCALED_Z24_UNORM
};
return find_supported_format(screen, formats, Elements(formats),
target, tex_usage, geom_flags);
}
case GL_SRGB_EXT:
case GL_SRGB8_EXT:
case GL_COMPRESSED_SRGB_EXT:
case GL_COMPRESSED_SRGB_ALPHA_EXT:
case GL_SRGB_ALPHA_EXT:
case GL_SRGB8_ALPHA8_EXT:
return default_srgba_format( screen, target, tex_usage, geom_flags );
case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
return PIPE_FORMAT_DXT1_SRGB;
case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
return PIPE_FORMAT_DXT1_SRGBA;
case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
return PIPE_FORMAT_DXT3_SRGBA;
case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
return PIPE_FORMAT_DXT5_SRGBA;
case GL_SLUMINANCE_ALPHA_EXT:
case GL_SLUMINANCE8_ALPHA8_EXT:
case GL_COMPRESSED_SLUMINANCE_EXT:
case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_SRGB, target, tex_usage, geom_flags ))
return PIPE_FORMAT_L8A8_SRGB;
return default_srgba_format( screen, target, tex_usage, geom_flags );
case GL_SLUMINANCE_EXT:
case GL_SLUMINANCE8_EXT:
if (screen->is_format_supported( screen, PIPE_FORMAT_L8_SRGB, target, tex_usage, geom_flags ))
return PIPE_FORMAT_L8_SRGB;
return default_srgba_format( screen, target, tex_usage, geom_flags );
default:
return PIPE_FORMAT_NONE;
}
}
static GLboolean
is_depth_or_stencil_format(GLenum internalFormat)
{
switch (internalFormat) {
case GL_DEPTH_COMPONENT:
case GL_DEPTH_COMPONENT16:
case GL_DEPTH_COMPONENT24:
case GL_DEPTH_COMPONENT32:
case GL_STENCIL_INDEX:
case GL_STENCIL_INDEX1_EXT:
case GL_STENCIL_INDEX4_EXT:
case GL_STENCIL_INDEX8_EXT:
case GL_STENCIL_INDEX16_EXT:
case GL_DEPTH_STENCIL_EXT:
case GL_DEPTH24_STENCIL8_EXT:
return GL_TRUE;
default:
return GL_FALSE;
}
}
/**
* Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.
*/
enum pipe_format
st_choose_renderbuffer_format(struct pipe_screen *screen,
GLenum internalFormat)
{
uint usage;
if (is_depth_or_stencil_format(internalFormat))
usage = PIPE_BIND_DEPTH_STENCIL;
else
usage = PIPE_BIND_RENDER_TARGET;
return st_choose_format(screen, internalFormat, PIPE_TEXTURE_2D, usage);
}
/**
* Called via ctx->Driver.chooseTextureFormat().
*/
gl_format
st_ChooseTextureFormat(GLcontext *ctx, GLint internalFormat,
GLenum format, GLenum type)
{
struct pipe_screen *screen = st_context(ctx)->pipe->screen;
enum pipe_format pFormat;
uint bindings;
(void) format;
(void) type;
/* GL textures may wind up being render targets, but we don't know
* that in advance. Specify potential render target flags now.
*/
if (_mesa_is_depth_format(internalFormat) ||
_mesa_is_depthstencil_format(internalFormat))
bindings = PIPE_BIND_SAMPLER_VIEW | PIPE_BIND_DEPTH_STENCIL;
else
bindings = PIPE_BIND_SAMPLER_VIEW | PIPE_BIND_RENDER_TARGET;
pFormat = st_choose_format(screen, internalFormat,
PIPE_TEXTURE_2D, bindings);
if (pFormat == PIPE_FORMAT_NONE) {
/* try choosing format again, this time without render target bindings */
pFormat = st_choose_format(screen, internalFormat,
PIPE_TEXTURE_2D, PIPE_BIND_SAMPLER_VIEW);
}
if (pFormat == PIPE_FORMAT_NONE) {
/* no luck at all */
return MESA_FORMAT_NONE;
}
return st_pipe_format_to_mesa_format(pFormat);
}
/**
* Test if a gallium format is equivalent to a GL format/type.
*/
GLboolean
st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
{
switch (pFormat) {
case PIPE_FORMAT_A8B8G8R8_UNORM:
return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
case PIPE_FORMAT_A8R8G8B8_UNORM:
return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
case PIPE_FORMAT_B5G6R5_UNORM:
return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
/* XXX more combos... */
default:
return GL_FALSE;
}
}