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Regard whitespace Rev 1900 → Rev 1901

/programs/develop/libraries/Mesa/src/mesa/main/image.c
0,0 → 1,1874
/*
* Mesa 3-D graphics library
* Version: 7.5
*
* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
* Copyright (C) 2009 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
* BRIAN PAUL 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.
*/
 
 
/**
* \file image.c
* Image handling.
*/
 
 
#include "glheader.h"
#include "colormac.h"
#include "image.h"
#include "imports.h"
#include "macros.h"
 
 
/**
* NOTE:
* Normally, BYTE_TO_FLOAT(0) returns 0.00392 That causes problems when
* we later convert the float to a packed integer value (such as for
* GL_RGB5_A1) because we'll wind up with a non-zero value.
*
* We redefine the macros here so zero is handled correctly.
*/
#undef BYTE_TO_FLOAT
#define BYTE_TO_FLOAT(B) ((B) == 0 ? 0.0F : ((2.0F * (B) + 1.0F) * (1.0F/255.0F)))
 
#undef SHORT_TO_FLOAT
#define SHORT_TO_FLOAT(S) ((S) == 0 ? 0.0F : ((2.0F * (S) + 1.0F) * (1.0F/65535.0F)))
 
 
 
/** Compute ceiling of integer quotient of A divided by B. */
#define CEILING( A, B ) ( (A) % (B) == 0 ? (A)/(B) : (A)/(B)+1 )
 
 
/**
* \return GL_TRUE if type is packed pixel type, GL_FALSE otherwise.
*/
GLboolean
_mesa_type_is_packed(GLenum type)
{
switch (type) {
case GL_UNSIGNED_BYTE_3_3_2:
case GL_UNSIGNED_BYTE_2_3_3_REV:
case GL_UNSIGNED_SHORT_5_6_5:
case GL_UNSIGNED_SHORT_5_6_5_REV:
case GL_UNSIGNED_SHORT_4_4_4_4:
case GL_UNSIGNED_SHORT_4_4_4_4_REV:
case GL_UNSIGNED_SHORT_5_5_5_1:
case GL_UNSIGNED_SHORT_1_5_5_5_REV:
case GL_UNSIGNED_INT_8_8_8_8:
case GL_UNSIGNED_INT_8_8_8_8_REV:
case GL_UNSIGNED_INT_10_10_10_2:
case GL_UNSIGNED_INT_2_10_10_10_REV:
case GL_UNSIGNED_SHORT_8_8_MESA:
case GL_UNSIGNED_SHORT_8_8_REV_MESA:
case GL_UNSIGNED_INT_24_8_EXT:
return GL_TRUE;
}
 
return GL_FALSE;
}
 
 
 
/**
* Flip the order of the 2 bytes in each word in the given array.
*
* \param p array.
* \param n number of words.
*/
void
_mesa_swap2( GLushort *p, GLuint n )
{
GLuint i;
for (i = 0; i < n; i++) {
p[i] = (p[i] >> 8) | ((p[i] << 8) & 0xff00);
}
}
 
 
 
/*
* Flip the order of the 4 bytes in each word in the given array.
*/
void
_mesa_swap4( GLuint *p, GLuint n )
{
GLuint i, a, b;
for (i = 0; i < n; i++) {
b = p[i];
a = (b >> 24)
| ((b >> 8) & 0xff00)
| ((b << 8) & 0xff0000)
| ((b << 24) & 0xff000000);
p[i] = a;
}
}
 
 
/**
* Get the size of a GL data type.
*
* \param type GL data type.
*
* \return the size, in bytes, of the given data type, 0 if a GL_BITMAP, or -1
* if an invalid type enum.
*/
GLint
_mesa_sizeof_type( GLenum type )
{
switch (type) {
case GL_BITMAP:
return 0;
case GL_UNSIGNED_BYTE:
return sizeof(GLubyte);
case GL_BYTE:
return sizeof(GLbyte);
case GL_UNSIGNED_SHORT:
return sizeof(GLushort);
case GL_SHORT:
return sizeof(GLshort);
case GL_UNSIGNED_INT:
return sizeof(GLuint);
case GL_INT:
return sizeof(GLint);
case GL_FLOAT:
return sizeof(GLfloat);
case GL_DOUBLE:
return sizeof(GLdouble);
case GL_HALF_FLOAT_ARB:
return sizeof(GLhalfARB);
case GL_FIXED:
return sizeof(GLfixed);
default:
return -1;
}
}
 
 
/**
* Same as _mesa_sizeof_type() but also accepting the packed pixel
* format data types.
*/
GLint
_mesa_sizeof_packed_type( GLenum type )
{
switch (type) {
case GL_BITMAP:
return 0;
case GL_UNSIGNED_BYTE:
return sizeof(GLubyte);
case GL_BYTE:
return sizeof(GLbyte);
case GL_UNSIGNED_SHORT:
return sizeof(GLushort);
case GL_SHORT:
return sizeof(GLshort);
case GL_UNSIGNED_INT:
return sizeof(GLuint);
case GL_INT:
return sizeof(GLint);
case GL_HALF_FLOAT_ARB:
return sizeof(GLhalfARB);
case GL_FLOAT:
return sizeof(GLfloat);
case GL_UNSIGNED_BYTE_3_3_2:
return sizeof(GLubyte);
case GL_UNSIGNED_BYTE_2_3_3_REV:
return sizeof(GLubyte);
case GL_UNSIGNED_SHORT_5_6_5:
return sizeof(GLushort);
case GL_UNSIGNED_SHORT_5_6_5_REV:
return sizeof(GLushort);
case GL_UNSIGNED_SHORT_4_4_4_4:
return sizeof(GLushort);
case GL_UNSIGNED_SHORT_4_4_4_4_REV:
return sizeof(GLushort);
case GL_UNSIGNED_SHORT_5_5_5_1:
return sizeof(GLushort);
case GL_UNSIGNED_SHORT_1_5_5_5_REV:
return sizeof(GLushort);
case GL_UNSIGNED_INT_8_8_8_8:
return sizeof(GLuint);
case GL_UNSIGNED_INT_8_8_8_8_REV:
return sizeof(GLuint);
case GL_UNSIGNED_INT_10_10_10_2:
return sizeof(GLuint);
case GL_UNSIGNED_INT_2_10_10_10_REV:
return sizeof(GLuint);
case GL_UNSIGNED_SHORT_8_8_MESA:
case GL_UNSIGNED_SHORT_8_8_REV_MESA:
return sizeof(GLushort);
case GL_UNSIGNED_INT_24_8_EXT:
return sizeof(GLuint);
default:
return -1;
}
}
 
 
/**
* Get the number of components in a pixel format.
*
* \param format pixel format.
*
* \return the number of components in the given format, or -1 if a bad format.
*/
GLint
_mesa_components_in_format( GLenum format )
{
switch (format) {
case GL_COLOR_INDEX:
case GL_COLOR_INDEX1_EXT:
case GL_COLOR_INDEX2_EXT:
case GL_COLOR_INDEX4_EXT:
case GL_COLOR_INDEX8_EXT:
case GL_COLOR_INDEX12_EXT:
case GL_COLOR_INDEX16_EXT:
case GL_STENCIL_INDEX:
case GL_DEPTH_COMPONENT:
case GL_RED:
case GL_RED_INTEGER_EXT:
case GL_GREEN:
case GL_GREEN_INTEGER_EXT:
case GL_BLUE:
case GL_BLUE_INTEGER_EXT:
case GL_ALPHA:
case GL_ALPHA_INTEGER_EXT:
case GL_LUMINANCE:
case GL_LUMINANCE_INTEGER_EXT:
case GL_INTENSITY:
return 1;
case GL_LUMINANCE_ALPHA:
case GL_LUMINANCE_ALPHA_INTEGER_EXT:
case GL_RG:
return 2;
case GL_RGB:
case GL_RGB_INTEGER_EXT:
return 3;
case GL_RGBA:
case GL_RGBA_INTEGER_EXT:
return 4;
case GL_BGR:
return 3;
case GL_BGRA:
return 4;
case GL_ABGR_EXT:
return 4;
case GL_YCBCR_MESA:
return 2;
case GL_DEPTH_STENCIL_EXT:
return 2;
case GL_DUDV_ATI:
case GL_DU8DV8_ATI:
return 2;
default:
return -1;
}
}
 
 
/**
* Get the bytes per pixel of pixel format type pair.
*
* \param format pixel format.
* \param type pixel type.
*
* \return bytes per pixel, or -1 if a bad format or type was given.
*/
GLint
_mesa_bytes_per_pixel( GLenum format, GLenum type )
{
GLint comps = _mesa_components_in_format( format );
if (comps < 0)
return -1;
 
switch (type) {
case GL_BITMAP:
return 0; /* special case */
case GL_BYTE:
case GL_UNSIGNED_BYTE:
return comps * sizeof(GLubyte);
case GL_SHORT:
case GL_UNSIGNED_SHORT:
return comps * sizeof(GLshort);
case GL_INT:
case GL_UNSIGNED_INT:
return comps * sizeof(GLint);
case GL_FLOAT:
return comps * sizeof(GLfloat);
case GL_HALF_FLOAT_ARB:
return comps * sizeof(GLhalfARB);
case GL_UNSIGNED_BYTE_3_3_2:
case GL_UNSIGNED_BYTE_2_3_3_REV:
if (format == GL_RGB || format == GL_BGR ||
format == GL_RGB_INTEGER_EXT || format == GL_BGR_INTEGER_EXT)
return sizeof(GLubyte);
else
return -1; /* error */
case GL_UNSIGNED_SHORT_5_6_5:
case GL_UNSIGNED_SHORT_5_6_5_REV:
if (format == GL_RGB || format == GL_BGR ||
format == GL_RGB_INTEGER_EXT || format == GL_BGR_INTEGER_EXT)
return sizeof(GLushort);
else
return -1; /* error */
case GL_UNSIGNED_SHORT_4_4_4_4:
case GL_UNSIGNED_SHORT_4_4_4_4_REV:
case GL_UNSIGNED_SHORT_5_5_5_1:
case GL_UNSIGNED_SHORT_1_5_5_5_REV:
if (format == GL_RGBA || format == GL_BGRA || format == GL_ABGR_EXT ||
format == GL_RGBA_INTEGER_EXT || format == GL_BGRA_INTEGER_EXT)
return sizeof(GLushort);
else
return -1;
case GL_UNSIGNED_INT_8_8_8_8:
case GL_UNSIGNED_INT_8_8_8_8_REV:
case GL_UNSIGNED_INT_10_10_10_2:
case GL_UNSIGNED_INT_2_10_10_10_REV:
if (format == GL_RGBA || format == GL_BGRA || format == GL_ABGR_EXT ||
format == GL_RGBA_INTEGER_EXT || format == GL_BGRA_INTEGER_EXT)
return sizeof(GLuint);
else
return -1;
case GL_UNSIGNED_SHORT_8_8_MESA:
case GL_UNSIGNED_SHORT_8_8_REV_MESA:
if (format == GL_YCBCR_MESA)
return sizeof(GLushort);
else
return -1;
case GL_UNSIGNED_INT_24_8_EXT:
if (format == GL_DEPTH_STENCIL_EXT)
return sizeof(GLuint);
else
return -1;
default:
return -1;
}
}
 
 
/**
* Test for a legal pixel format and type.
*
* \param format pixel format.
* \param type pixel type.
*
* \return GL_TRUE if the given pixel format and type are legal, or GL_FALSE
* otherwise.
*/
GLboolean
_mesa_is_legal_format_and_type(const struct gl_context *ctx,
GLenum format, GLenum type)
{
switch (format) {
case GL_COLOR_INDEX:
case GL_STENCIL_INDEX:
switch (type) {
case GL_BITMAP:
case GL_BYTE:
case GL_UNSIGNED_BYTE:
case GL_SHORT:
case GL_UNSIGNED_SHORT:
case GL_INT:
case GL_UNSIGNED_INT:
case GL_FLOAT:
return GL_TRUE;
case GL_HALF_FLOAT_ARB:
return ctx->Extensions.ARB_half_float_pixel;
default:
return GL_FALSE;
}
case GL_RED:
case GL_GREEN:
case GL_BLUE:
case GL_ALPHA:
#if 0 /* not legal! see table 3.6 of the 1.5 spec */
case GL_INTENSITY:
#endif
case GL_LUMINANCE:
case GL_LUMINANCE_ALPHA:
case GL_DEPTH_COMPONENT:
switch (type) {
case GL_BYTE:
case GL_UNSIGNED_BYTE:
case GL_SHORT:
case GL_UNSIGNED_SHORT:
case GL_INT:
case GL_UNSIGNED_INT:
case GL_FLOAT:
return GL_TRUE;
case GL_HALF_FLOAT_ARB:
return ctx->Extensions.ARB_half_float_pixel;
default:
return GL_FALSE;
}
case GL_RG:
if (!ctx->Extensions.ARB_texture_rg)
return GL_FALSE;
 
switch (type) {
case GL_BYTE:
case GL_UNSIGNED_BYTE:
case GL_SHORT:
case GL_UNSIGNED_SHORT:
case GL_INT:
case GL_UNSIGNED_INT:
case GL_FLOAT:
return GL_TRUE;
case GL_HALF_FLOAT_ARB:
return ctx->Extensions.ARB_half_float_pixel;
default:
return GL_FALSE;
}
case GL_RGB:
switch (type) {
case GL_BYTE:
case GL_UNSIGNED_BYTE:
case GL_SHORT:
case GL_UNSIGNED_SHORT:
case GL_INT:
case GL_UNSIGNED_INT:
case GL_FLOAT:
case GL_UNSIGNED_BYTE_3_3_2:
case GL_UNSIGNED_BYTE_2_3_3_REV:
case GL_UNSIGNED_SHORT_5_6_5:
case GL_UNSIGNED_SHORT_5_6_5_REV:
return GL_TRUE;
case GL_HALF_FLOAT_ARB:
return ctx->Extensions.ARB_half_float_pixel;
default:
return GL_FALSE;
}
case GL_BGR:
switch (type) {
/* NOTE: no packed types are supported with BGR. That's
* intentional, according to the GL spec.
*/
case GL_BYTE:
case GL_UNSIGNED_BYTE:
case GL_SHORT:
case GL_UNSIGNED_SHORT:
case GL_INT:
case GL_UNSIGNED_INT:
case GL_FLOAT:
return GL_TRUE;
case GL_HALF_FLOAT_ARB:
return ctx->Extensions.ARB_half_float_pixel;
default:
return GL_FALSE;
}
case GL_RGBA:
case GL_BGRA:
case GL_ABGR_EXT:
switch (type) {
case GL_BYTE:
case GL_UNSIGNED_BYTE:
case GL_SHORT:
case GL_UNSIGNED_SHORT:
case GL_INT:
case GL_UNSIGNED_INT:
case GL_FLOAT:
case GL_UNSIGNED_SHORT_4_4_4_4:
case GL_UNSIGNED_SHORT_4_4_4_4_REV:
case GL_UNSIGNED_SHORT_5_5_5_1:
case GL_UNSIGNED_SHORT_1_5_5_5_REV:
case GL_UNSIGNED_INT_8_8_8_8:
case GL_UNSIGNED_INT_8_8_8_8_REV:
case GL_UNSIGNED_INT_10_10_10_2:
case GL_UNSIGNED_INT_2_10_10_10_REV:
return GL_TRUE;
case GL_HALF_FLOAT_ARB:
return ctx->Extensions.ARB_half_float_pixel;
default:
return GL_FALSE;
}
case GL_YCBCR_MESA:
if (type == GL_UNSIGNED_SHORT_8_8_MESA ||
type == GL_UNSIGNED_SHORT_8_8_REV_MESA)
return GL_TRUE;
else
return GL_FALSE;
case GL_DEPTH_STENCIL_EXT:
if (ctx->Extensions.EXT_packed_depth_stencil
&& type == GL_UNSIGNED_INT_24_8_EXT)
return GL_TRUE;
else
return GL_FALSE;
case GL_DUDV_ATI:
case GL_DU8DV8_ATI:
switch (type) {
case GL_BYTE:
case GL_UNSIGNED_BYTE:
case GL_SHORT:
case GL_UNSIGNED_SHORT:
case GL_INT:
case GL_UNSIGNED_INT:
case GL_FLOAT:
return GL_TRUE;
default:
return GL_FALSE;
}
 
/* integer-valued formats */
case GL_RED_INTEGER_EXT:
case GL_GREEN_INTEGER_EXT:
case GL_BLUE_INTEGER_EXT:
case GL_ALPHA_INTEGER_EXT:
switch (type) {
case GL_BYTE:
case GL_UNSIGNED_BYTE:
case GL_SHORT:
case GL_UNSIGNED_SHORT:
case GL_INT:
case GL_UNSIGNED_INT:
return ctx->Extensions.EXT_texture_integer;
default:
return GL_FALSE;
}
 
case GL_RGB_INTEGER_EXT:
switch (type) {
case GL_BYTE:
case GL_UNSIGNED_BYTE:
case GL_SHORT:
case GL_UNSIGNED_SHORT:
case GL_INT:
case GL_UNSIGNED_INT:
case GL_UNSIGNED_BYTE_3_3_2:
case GL_UNSIGNED_BYTE_2_3_3_REV:
case GL_UNSIGNED_SHORT_5_6_5:
case GL_UNSIGNED_SHORT_5_6_5_REV:
return ctx->Extensions.EXT_texture_integer;
default:
return GL_FALSE;
}
 
case GL_BGR_INTEGER_EXT:
switch (type) {
case GL_BYTE:
case GL_UNSIGNED_BYTE:
case GL_SHORT:
case GL_UNSIGNED_SHORT:
case GL_INT:
case GL_UNSIGNED_INT:
/* NOTE: no packed formats w/ BGR format */
return ctx->Extensions.EXT_texture_integer;
default:
return GL_FALSE;
}
 
case GL_RGBA_INTEGER_EXT:
case GL_BGRA_INTEGER_EXT:
switch (type) {
case GL_BYTE:
case GL_UNSIGNED_BYTE:
case GL_SHORT:
case GL_UNSIGNED_SHORT:
case GL_INT:
case GL_UNSIGNED_INT:
case GL_UNSIGNED_SHORT_4_4_4_4:
case GL_UNSIGNED_SHORT_4_4_4_4_REV:
case GL_UNSIGNED_SHORT_5_5_5_1:
case GL_UNSIGNED_SHORT_1_5_5_5_REV:
case GL_UNSIGNED_INT_8_8_8_8:
case GL_UNSIGNED_INT_8_8_8_8_REV:
case GL_UNSIGNED_INT_10_10_10_2:
case GL_UNSIGNED_INT_2_10_10_10_REV:
return ctx->Extensions.EXT_texture_integer;
default:
return GL_FALSE;
}
 
case GL_LUMINANCE_INTEGER_EXT:
case GL_LUMINANCE_ALPHA_INTEGER_EXT:
switch (type) {
case GL_BYTE:
case GL_UNSIGNED_BYTE:
case GL_SHORT:
case GL_UNSIGNED_SHORT:
case GL_INT:
case GL_UNSIGNED_INT:
return ctx->Extensions.EXT_texture_integer;
default:
return GL_FALSE;
}
 
default:
; /* fall-through */
}
return GL_FALSE;
}
 
 
/**
* Test if the given image format is a color/RGBA format (i.e., not color
* index, depth, stencil, etc).
* \param format the image format value (may by an internal texture format)
* \return GL_TRUE if its a color/RGBA format, GL_FALSE otherwise.
*/
GLboolean
_mesa_is_color_format(GLenum format)
{
switch (format) {
case GL_RED:
case GL_GREEN:
case GL_BLUE:
case GL_ALPHA:
case GL_ALPHA4:
case GL_ALPHA8:
case GL_ALPHA12:
case GL_ALPHA16:
case 1:
case GL_LUMINANCE:
case GL_LUMINANCE4:
case GL_LUMINANCE8:
case GL_LUMINANCE12:
case GL_LUMINANCE16:
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_INTENSITY:
case GL_INTENSITY4:
case GL_INTENSITY8:
case GL_INTENSITY12:
case GL_INTENSITY16:
case GL_R8:
case GL_R16:
case GL_RG:
case GL_RG8:
case GL_RG16:
case 3:
case GL_RGB:
case GL_BGR:
case GL_R3_G3_B2:
case GL_RGB4:
case GL_RGB5:
case GL_RGB8:
case GL_RGB10:
case GL_RGB12:
case GL_RGB16:
case 4:
case GL_ABGR_EXT:
case GL_RGBA:
case GL_BGRA:
case GL_RGBA2:
case GL_RGBA4:
case GL_RGB5_A1:
case GL_RGBA8:
case GL_RGB10_A2:
case GL_RGBA12:
case GL_RGBA16:
/* float texture formats */
case GL_ALPHA16F_ARB:
case GL_ALPHA32F_ARB:
case GL_LUMINANCE16F_ARB:
case GL_LUMINANCE32F_ARB:
case GL_LUMINANCE_ALPHA16F_ARB:
case GL_LUMINANCE_ALPHA32F_ARB:
case GL_INTENSITY16F_ARB:
case GL_INTENSITY32F_ARB:
case GL_R16F:
case GL_R32F:
case GL_RG16F:
case GL_RG32F:
case GL_RGB16F_ARB:
case GL_RGB32F_ARB:
case GL_RGBA16F_ARB:
case GL_RGBA32F_ARB:
/* compressed formats */
case GL_COMPRESSED_ALPHA:
case GL_COMPRESSED_LUMINANCE:
case GL_COMPRESSED_LUMINANCE_ALPHA:
case GL_COMPRESSED_INTENSITY:
case GL_COMPRESSED_RED:
case GL_COMPRESSED_RG:
case GL_COMPRESSED_RGB:
case GL_COMPRESSED_RGBA:
case GL_RGB_S3TC:
case GL_RGB4_S3TC:
case GL_RGBA_S3TC:
case GL_RGBA4_S3TC:
case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
case GL_COMPRESSED_RGB_FXT1_3DFX:
case GL_COMPRESSED_RGBA_FXT1_3DFX:
#if FEATURE_EXT_texture_sRGB
case GL_SRGB_EXT:
case GL_SRGB8_EXT:
case GL_SRGB_ALPHA_EXT:
case GL_SRGB8_ALPHA8_EXT:
case GL_SLUMINANCE_ALPHA_EXT:
case GL_SLUMINANCE8_ALPHA8_EXT:
case GL_SLUMINANCE_EXT:
case GL_SLUMINANCE8_EXT:
case GL_COMPRESSED_SRGB_EXT:
case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
case GL_COMPRESSED_SRGB_ALPHA_EXT:
case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
case GL_COMPRESSED_SLUMINANCE_EXT:
case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
#endif /* FEATURE_EXT_texture_sRGB */
case GL_COMPRESSED_RED_RGTC1:
case GL_COMPRESSED_SIGNED_RED_RGTC1:
case GL_COMPRESSED_RG_RGTC2:
case GL_COMPRESSED_SIGNED_RG_RGTC2:
/* signed, normalized texture formats */
case GL_RGBA_SNORM:
case GL_RGBA8_SNORM:
/* generic integer formats */
case GL_RED_INTEGER_EXT:
case GL_GREEN_INTEGER_EXT:
case GL_BLUE_INTEGER_EXT:
case GL_ALPHA_INTEGER_EXT:
case GL_RGB_INTEGER_EXT:
case GL_RGBA_INTEGER_EXT:
case GL_BGR_INTEGER_EXT:
case GL_BGRA_INTEGER_EXT:
case GL_LUMINANCE_INTEGER_EXT:
case GL_LUMINANCE_ALPHA_INTEGER_EXT:
/* sized integer formats */
case GL_RGBA32UI_EXT:
case GL_RGB32UI_EXT:
case GL_ALPHA32UI_EXT:
case GL_INTENSITY32UI_EXT:
case GL_LUMINANCE32UI_EXT:
case GL_LUMINANCE_ALPHA32UI_EXT:
case GL_RGBA16UI_EXT:
case GL_RGB16UI_EXT:
case GL_ALPHA16UI_EXT:
case GL_INTENSITY16UI_EXT:
case GL_LUMINANCE16UI_EXT:
case GL_LUMINANCE_ALPHA16UI_EXT:
case GL_RGBA8UI_EXT:
case GL_RGB8UI_EXT:
case GL_ALPHA8UI_EXT:
case GL_INTENSITY8UI_EXT:
case GL_LUMINANCE8UI_EXT:
case GL_LUMINANCE_ALPHA8UI_EXT:
case GL_RGBA32I_EXT:
case GL_RGB32I_EXT:
case GL_ALPHA32I_EXT:
case GL_INTENSITY32I_EXT:
case GL_LUMINANCE32I_EXT:
case GL_LUMINANCE_ALPHA32I_EXT:
case GL_RGBA16I_EXT:
case GL_RGB16I_EXT:
case GL_ALPHA16I_EXT:
case GL_INTENSITY16I_EXT:
case GL_LUMINANCE16I_EXT:
case GL_LUMINANCE_ALPHA16I_EXT:
case GL_RGBA8I_EXT:
case GL_RGB8I_EXT:
case GL_ALPHA8I_EXT:
case GL_INTENSITY8I_EXT:
case GL_LUMINANCE8I_EXT:
case GL_LUMINANCE_ALPHA8I_EXT:
return GL_TRUE;
case GL_YCBCR_MESA: /* not considered to be RGB */
/* fall-through */
default:
return GL_FALSE;
}
}
 
 
/**
* Test if the given image format is a color index format.
*/
GLboolean
_mesa_is_index_format(GLenum format)
{
switch (format) {
case GL_COLOR_INDEX:
case GL_COLOR_INDEX1_EXT:
case GL_COLOR_INDEX2_EXT:
case GL_COLOR_INDEX4_EXT:
case GL_COLOR_INDEX8_EXT:
case GL_COLOR_INDEX12_EXT:
case GL_COLOR_INDEX16_EXT:
return GL_TRUE;
default:
return GL_FALSE;
}
}
 
 
/**
* Test if the given image format is a depth component format.
*/
GLboolean
_mesa_is_depth_format(GLenum format)
{
switch (format) {
case GL_DEPTH_COMPONENT:
case GL_DEPTH_COMPONENT16:
case GL_DEPTH_COMPONENT24:
case GL_DEPTH_COMPONENT32:
return GL_TRUE;
default:
return GL_FALSE;
}
}
 
 
/**
* Test if the given image format is a stencil format.
*/
GLboolean
_mesa_is_stencil_format(GLenum format)
{
switch (format) {
case GL_STENCIL_INDEX:
case GL_DEPTH_STENCIL:
return GL_TRUE;
default:
return GL_FALSE;
}
}
 
 
/**
* Test if the given image format is a YCbCr format.
*/
GLboolean
_mesa_is_ycbcr_format(GLenum format)
{
switch (format) {
case GL_YCBCR_MESA:
return GL_TRUE;
default:
return GL_FALSE;
}
}
 
 
/**
* Test if the given image format is a depth+stencil format.
*/
GLboolean
_mesa_is_depthstencil_format(GLenum format)
{
switch (format) {
case GL_DEPTH24_STENCIL8_EXT:
case GL_DEPTH_STENCIL_EXT:
return GL_TRUE;
default:
return GL_FALSE;
}
}
 
 
/**
* Test if the given image format is a depth or stencil format.
*/
GLboolean
_mesa_is_depth_or_stencil_format(GLenum format)
{
switch (format) {
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;
}
}
 
 
/**
* Test if the given image format is a dudv format.
*/
GLboolean
_mesa_is_dudv_format(GLenum format)
{
switch (format) {
case GL_DUDV_ATI:
case GL_DU8DV8_ATI:
return GL_TRUE;
default:
return GL_FALSE;
}
}
 
 
/**
* Test if the given format is an integer (non-normalized) format.
*/
GLboolean
_mesa_is_integer_format(GLenum format)
{
switch (format) {
/* generic integer formats */
case GL_RED_INTEGER_EXT:
case GL_GREEN_INTEGER_EXT:
case GL_BLUE_INTEGER_EXT:
case GL_ALPHA_INTEGER_EXT:
case GL_RGB_INTEGER_EXT:
case GL_RGBA_INTEGER_EXT:
case GL_BGR_INTEGER_EXT:
case GL_BGRA_INTEGER_EXT:
case GL_LUMINANCE_INTEGER_EXT:
case GL_LUMINANCE_ALPHA_INTEGER_EXT:
/* specific integer formats */
case GL_RGBA32UI_EXT:
case GL_RGB32UI_EXT:
case GL_ALPHA32UI_EXT:
case GL_INTENSITY32UI_EXT:
case GL_LUMINANCE32UI_EXT:
case GL_LUMINANCE_ALPHA32UI_EXT:
case GL_RGBA16UI_EXT:
case GL_RGB16UI_EXT:
case GL_ALPHA16UI_EXT:
case GL_INTENSITY16UI_EXT:
case GL_LUMINANCE16UI_EXT:
case GL_LUMINANCE_ALPHA16UI_EXT:
case GL_RGBA8UI_EXT:
case GL_RGB8UI_EXT:
case GL_ALPHA8UI_EXT:
case GL_INTENSITY8UI_EXT:
case GL_LUMINANCE8UI_EXT:
case GL_LUMINANCE_ALPHA8UI_EXT:
case GL_RGBA32I_EXT:
case GL_RGB32I_EXT:
case GL_ALPHA32I_EXT:
case GL_INTENSITY32I_EXT:
case GL_LUMINANCE32I_EXT:
case GL_LUMINANCE_ALPHA32I_EXT:
case GL_RGBA16I_EXT:
case GL_RGB16I_EXT:
case GL_ALPHA16I_EXT:
case GL_INTENSITY16I_EXT:
case GL_LUMINANCE16I_EXT:
case GL_LUMINANCE_ALPHA16I_EXT:
case GL_RGBA8I_EXT:
case GL_RGB8I_EXT:
case GL_ALPHA8I_EXT:
case GL_INTENSITY8I_EXT:
case GL_LUMINANCE8I_EXT:
case GL_LUMINANCE_ALPHA8I_EXT:
return GL_TRUE;
default:
return GL_FALSE;
}
}
 
 
/**
* Test if an image format is a supported compressed format.
* \param format the internal format token provided by the user.
* \return GL_TRUE if compressed, GL_FALSE if uncompressed
*/
GLboolean
_mesa_is_compressed_format(struct gl_context *ctx, GLenum format)
{
switch (format) {
case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
return ctx->Extensions.EXT_texture_compression_s3tc;
case GL_RGB_S3TC:
case GL_RGB4_S3TC:
case GL_RGBA_S3TC:
case GL_RGBA4_S3TC:
return ctx->Extensions.S3_s3tc;
case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
return ctx->Extensions.EXT_texture_sRGB
&& ctx->Extensions.EXT_texture_compression_s3tc;
case GL_COMPRESSED_RGB_FXT1_3DFX:
case GL_COMPRESSED_RGBA_FXT1_3DFX:
return ctx->Extensions.TDFX_texture_compression_FXT1;
case GL_COMPRESSED_RED_RGTC1:
case GL_COMPRESSED_SIGNED_RED_RGTC1:
case GL_COMPRESSED_RG_RGTC2:
case GL_COMPRESSED_SIGNED_RG_RGTC2:
return ctx->Extensions.ARB_texture_compression_rgtc;
default:
return GL_FALSE;
}
}
 
 
/**
* Return the address of a specific pixel in an image (1D, 2D or 3D).
*
* Pixel unpacking/packing parameters are observed according to \p packing.
*
* \param dimensions either 1, 2 or 3 to indicate dimensionality of image
* \param image starting address of image data
* \param width the image width
* \param height theimage height
* \param format the pixel format
* \param type the pixel data type
* \param packing the pixelstore attributes
* \param img which image in the volume (0 for 1D or 2D images)
* \param row row of pixel in the image (0 for 1D images)
* \param column column of pixel in the image
*
* \return address of pixel on success, or NULL on error.
*
* \sa gl_pixelstore_attrib.
*/
GLvoid *
_mesa_image_address( GLuint dimensions,
const struct gl_pixelstore_attrib *packing,
const GLvoid *image,
GLsizei width, GLsizei height,
GLenum format, GLenum type,
GLint img, GLint row, GLint column )
{
GLint alignment; /* 1, 2 or 4 */
GLint pixels_per_row;
GLint rows_per_image;
GLint skiprows;
GLint skippixels;
GLint skipimages; /* for 3-D volume images */
GLubyte *pixel_addr;
 
ASSERT(dimensions >= 1 && dimensions <= 3);
 
alignment = packing->Alignment;
if (packing->RowLength > 0) {
pixels_per_row = packing->RowLength;
}
else {
pixels_per_row = width;
}
if (packing->ImageHeight > 0) {
rows_per_image = packing->ImageHeight;
}
else {
rows_per_image = height;
}
 
skippixels = packing->SkipPixels;
/* Note: SKIP_ROWS _is_ used for 1D images */
skiprows = packing->SkipRows;
/* Note: SKIP_IMAGES is only used for 3D images */
skipimages = (dimensions == 3) ? packing->SkipImages : 0;
 
if (type == GL_BITMAP) {
/* BITMAP data */
GLint comp_per_pixel; /* components per pixel */
GLint bytes_per_comp; /* bytes per component */
GLint bytes_per_row;
GLint bytes_per_image;
 
/* Compute bytes per component */
bytes_per_comp = _mesa_sizeof_packed_type( type );
if (bytes_per_comp < 0) {
return NULL;
}
 
/* Compute number of components per pixel */
comp_per_pixel = _mesa_components_in_format( format );
if (comp_per_pixel < 0) {
return NULL;
}
 
bytes_per_row = alignment
* CEILING( comp_per_pixel*pixels_per_row, 8*alignment );
 
bytes_per_image = bytes_per_row * rows_per_image;
 
pixel_addr = (GLubyte *) image
+ (skipimages + img) * bytes_per_image
+ (skiprows + row) * bytes_per_row
+ (skippixels + column) / 8;
}
else {
/* Non-BITMAP data */
GLint bytes_per_pixel, bytes_per_row, remainder, bytes_per_image;
GLint topOfImage;
 
bytes_per_pixel = _mesa_bytes_per_pixel( format, type );
 
/* The pixel type and format should have been error checked earlier */
assert(bytes_per_pixel > 0);
 
bytes_per_row = pixels_per_row * bytes_per_pixel;
remainder = bytes_per_row % alignment;
if (remainder > 0)
bytes_per_row += (alignment - remainder);
 
ASSERT(bytes_per_row % alignment == 0);
 
bytes_per_image = bytes_per_row * rows_per_image;
 
if (packing->Invert) {
/* set pixel_addr to the last row */
topOfImage = bytes_per_row * (height - 1);
bytes_per_row = -bytes_per_row;
}
else {
topOfImage = 0;
}
 
/* compute final pixel address */
pixel_addr = (GLubyte *) image
+ (skipimages + img) * bytes_per_image
+ topOfImage
+ (skiprows + row) * bytes_per_row
+ (skippixels + column) * bytes_per_pixel;
}
 
return (GLvoid *) pixel_addr;
}
 
 
GLvoid *
_mesa_image_address1d( const struct gl_pixelstore_attrib *packing,
const GLvoid *image,
GLsizei width,
GLenum format, GLenum type,
GLint column )
{
return _mesa_image_address(1, packing, image, width, 1,
format, type, 0, 0, column);
}
 
 
GLvoid *
_mesa_image_address2d( const struct gl_pixelstore_attrib *packing,
const GLvoid *image,
GLsizei width, GLsizei height,
GLenum format, GLenum type,
GLint row, GLint column )
{
return _mesa_image_address(2, packing, image, width, height,
format, type, 0, row, column);
}
 
 
GLvoid *
_mesa_image_address3d( const struct gl_pixelstore_attrib *packing,
const GLvoid *image,
GLsizei width, GLsizei height,
GLenum format, GLenum type,
GLint img, GLint row, GLint column )
{
return _mesa_image_address(3, packing, image, width, height,
format, type, img, row, column);
}
 
 
 
/**
* Compute the stride (in bytes) between image rows.
*
* \param packing the pixelstore attributes
* \param width image width.
* \param format pixel format.
* \param type pixel data type.
*
* \return the stride in bytes for the given parameters, or -1 if error
*/
GLint
_mesa_image_row_stride( const struct gl_pixelstore_attrib *packing,
GLint width, GLenum format, GLenum type )
{
GLint bytesPerRow, remainder;
 
ASSERT(packing);
 
if (type == GL_BITMAP) {
if (packing->RowLength == 0) {
bytesPerRow = (width + 7) / 8;
}
else {
bytesPerRow = (packing->RowLength + 7) / 8;
}
}
else {
/* Non-BITMAP data */
const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
if (bytesPerPixel <= 0)
return -1; /* error */
if (packing->RowLength == 0) {
bytesPerRow = bytesPerPixel * width;
}
else {
bytesPerRow = bytesPerPixel * packing->RowLength;
}
}
 
remainder = bytesPerRow % packing->Alignment;
if (remainder > 0) {
bytesPerRow += (packing->Alignment - remainder);
}
 
if (packing->Invert) {
/* negate the bytes per row (negative row stride) */
bytesPerRow = -bytesPerRow;
}
 
return bytesPerRow;
}
 
 
/*
* Compute the stride between images in a 3D texture (in bytes) for the given
* pixel packing parameters and image width, format and type.
*/
GLint
_mesa_image_image_stride( const struct gl_pixelstore_attrib *packing,
GLint width, GLint height,
GLenum format, GLenum type )
{
GLint bytesPerRow, bytesPerImage, remainder;
 
ASSERT(packing);
 
if (type == GL_BITMAP) {
if (packing->RowLength == 0) {
bytesPerRow = (width + 7) / 8;
}
else {
bytesPerRow = (packing->RowLength + 7) / 8;
}
}
else {
const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
 
if (bytesPerPixel <= 0)
return -1; /* error */
if (packing->RowLength == 0) {
bytesPerRow = bytesPerPixel * width;
}
else {
bytesPerRow = bytesPerPixel * packing->RowLength;
}
}
 
remainder = bytesPerRow % packing->Alignment;
if (remainder > 0)
bytesPerRow += (packing->Alignment - remainder);
 
if (packing->ImageHeight == 0)
bytesPerImage = bytesPerRow * height;
else
bytesPerImage = bytesPerRow * packing->ImageHeight;
 
return bytesPerImage;
}
 
 
 
/**
* "Expand" a bitmap from 1-bit per pixel to 8-bits per pixel.
* This is typically used to convert a bitmap into a GLubyte/pixel texture.
* "On" bits will set texels to \p onValue.
* "Off" bits will not modify texels.
* \param width src bitmap width in pixels
* \param height src bitmap height in pixels
* \param unpack bitmap unpacking state
* \param bitmap the src bitmap data
* \param destBuffer start of dest buffer
* \param destStride row stride in dest buffer
* \param onValue if bit is 1, set destBuffer pixel to this value
*/
void
_mesa_expand_bitmap(GLsizei width, GLsizei height,
const struct gl_pixelstore_attrib *unpack,
const GLubyte *bitmap,
GLubyte *destBuffer, GLint destStride,
GLubyte onValue)
{
const GLubyte *srcRow = (const GLubyte *)
_mesa_image_address2d(unpack, bitmap, width, height,
GL_COLOR_INDEX, GL_BITMAP, 0, 0);
const GLint srcStride = _mesa_image_row_stride(unpack, width,
GL_COLOR_INDEX, GL_BITMAP);
GLint row, col;
 
#define SET_PIXEL(COL, ROW) \
destBuffer[(ROW) * destStride + (COL)] = onValue;
 
for (row = 0; row < height; row++) {
const GLubyte *src = srcRow;
 
if (unpack->LsbFirst) {
/* Lsb first */
GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
for (col = 0; col < width; col++) {
 
if (*src & mask) {
SET_PIXEL(col, row);
}
 
if (mask == 128U) {
src++;
mask = 1U;
}
else {
mask = mask << 1;
}
}
 
/* get ready for next row */
if (mask != 1)
src++;
}
else {
/* Msb first */
GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
for (col = 0; col < width; col++) {
 
if (*src & mask) {
SET_PIXEL(col, row);
}
 
if (mask == 1U) {
src++;
mask = 128U;
}
else {
mask = mask >> 1;
}
}
 
/* get ready for next row */
if (mask != 128)
src++;
}
 
srcRow += srcStride;
} /* row */
 
#undef SET_PIXEL
}
 
 
 
 
/**
* Convert an array of RGBA colors from one datatype to another.
* NOTE: src may equal dst. In that case, we use a temporary buffer.
*/
void
_mesa_convert_colors(GLenum srcType, const GLvoid *src,
GLenum dstType, GLvoid *dst,
GLuint count, const GLubyte mask[])
{
GLuint tempBuffer[MAX_WIDTH][4];
const GLboolean useTemp = (src == dst);
 
ASSERT(srcType != dstType);
 
switch (srcType) {
case GL_UNSIGNED_BYTE:
if (dstType == GL_UNSIGNED_SHORT) {
const GLubyte (*src1)[4] = (const GLubyte (*)[4]) src;
GLushort (*dst2)[4] = (GLushort (*)[4]) (useTemp ? tempBuffer : dst);
GLuint i;
for (i = 0; i < count; i++) {
if (!mask || mask[i]) {
dst2[i][RCOMP] = UBYTE_TO_USHORT(src1[i][RCOMP]);
dst2[i][GCOMP] = UBYTE_TO_USHORT(src1[i][GCOMP]);
dst2[i][BCOMP] = UBYTE_TO_USHORT(src1[i][BCOMP]);
dst2[i][ACOMP] = UBYTE_TO_USHORT(src1[i][ACOMP]);
}
}
if (useTemp)
memcpy(dst, tempBuffer, count * 4 * sizeof(GLushort));
}
else {
const GLubyte (*src1)[4] = (const GLubyte (*)[4]) src;
GLfloat (*dst4)[4] = (GLfloat (*)[4]) (useTemp ? tempBuffer : dst);
GLuint i;
ASSERT(dstType == GL_FLOAT);
for (i = 0; i < count; i++) {
if (!mask || mask[i]) {
dst4[i][RCOMP] = UBYTE_TO_FLOAT(src1[i][RCOMP]);
dst4[i][GCOMP] = UBYTE_TO_FLOAT(src1[i][GCOMP]);
dst4[i][BCOMP] = UBYTE_TO_FLOAT(src1[i][BCOMP]);
dst4[i][ACOMP] = UBYTE_TO_FLOAT(src1[i][ACOMP]);
}
}
if (useTemp)
memcpy(dst, tempBuffer, count * 4 * sizeof(GLfloat));
}
break;
case GL_UNSIGNED_SHORT:
if (dstType == GL_UNSIGNED_BYTE) {
const GLushort (*src2)[4] = (const GLushort (*)[4]) src;
GLubyte (*dst1)[4] = (GLubyte (*)[4]) (useTemp ? tempBuffer : dst);
GLuint i;
for (i = 0; i < count; i++) {
if (!mask || mask[i]) {
dst1[i][RCOMP] = USHORT_TO_UBYTE(src2[i][RCOMP]);
dst1[i][GCOMP] = USHORT_TO_UBYTE(src2[i][GCOMP]);
dst1[i][BCOMP] = USHORT_TO_UBYTE(src2[i][BCOMP]);
dst1[i][ACOMP] = USHORT_TO_UBYTE(src2[i][ACOMP]);
}
}
if (useTemp)
memcpy(dst, tempBuffer, count * 4 * sizeof(GLubyte));
}
else {
const GLushort (*src2)[4] = (const GLushort (*)[4]) src;
GLfloat (*dst4)[4] = (GLfloat (*)[4]) (useTemp ? tempBuffer : dst);
GLuint i;
ASSERT(dstType == GL_FLOAT);
for (i = 0; i < count; i++) {
if (!mask || mask[i]) {
dst4[i][RCOMP] = USHORT_TO_FLOAT(src2[i][RCOMP]);
dst4[i][GCOMP] = USHORT_TO_FLOAT(src2[i][GCOMP]);
dst4[i][BCOMP] = USHORT_TO_FLOAT(src2[i][BCOMP]);
dst4[i][ACOMP] = USHORT_TO_FLOAT(src2[i][ACOMP]);
}
}
if (useTemp)
memcpy(dst, tempBuffer, count * 4 * sizeof(GLfloat));
}
break;
case GL_FLOAT:
if (dstType == GL_UNSIGNED_BYTE) {
const GLfloat (*src4)[4] = (const GLfloat (*)[4]) src;
GLubyte (*dst1)[4] = (GLubyte (*)[4]) (useTemp ? tempBuffer : dst);
GLuint i;
for (i = 0; i < count; i++) {
if (!mask || mask[i]) {
UNCLAMPED_FLOAT_TO_UBYTE(dst1[i][RCOMP], src4[i][RCOMP]);
UNCLAMPED_FLOAT_TO_UBYTE(dst1[i][GCOMP], src4[i][GCOMP]);
UNCLAMPED_FLOAT_TO_UBYTE(dst1[i][BCOMP], src4[i][BCOMP]);
UNCLAMPED_FLOAT_TO_UBYTE(dst1[i][ACOMP], src4[i][ACOMP]);
}
}
if (useTemp)
memcpy(dst, tempBuffer, count * 4 * sizeof(GLubyte));
}
else {
const GLfloat (*src4)[4] = (const GLfloat (*)[4]) src;
GLushort (*dst2)[4] = (GLushort (*)[4]) (useTemp ? tempBuffer : dst);
GLuint i;
ASSERT(dstType == GL_UNSIGNED_SHORT);
for (i = 0; i < count; i++) {
if (!mask || mask[i]) {
UNCLAMPED_FLOAT_TO_USHORT(dst2[i][RCOMP], src4[i][RCOMP]);
UNCLAMPED_FLOAT_TO_USHORT(dst2[i][GCOMP], src4[i][GCOMP]);
UNCLAMPED_FLOAT_TO_USHORT(dst2[i][BCOMP], src4[i][BCOMP]);
UNCLAMPED_FLOAT_TO_USHORT(dst2[i][ACOMP], src4[i][ACOMP]);
}
}
if (useTemp)
memcpy(dst, tempBuffer, count * 4 * sizeof(GLushort));
}
break;
default:
_mesa_problem(NULL, "Invalid datatype in _mesa_convert_colors");
}
}
 
 
 
 
/**
* Perform basic clipping for glDrawPixels. The image's position and size
* and the unpack SkipPixels and SkipRows are adjusted so that the image
* region is entirely within the window and scissor bounds.
* NOTE: this will only work when glPixelZoom is (1, 1) or (1, -1).
* If Pixel.ZoomY is -1, *destY will be changed to be the first row which
* we'll actually write. Beforehand, *destY-1 is the first drawing row.
*
* \return GL_TRUE if image is ready for drawing or
* GL_FALSE if image was completely clipped away (draw nothing)
*/
GLboolean
_mesa_clip_drawpixels(const struct gl_context *ctx,
GLint *destX, GLint *destY,
GLsizei *width, GLsizei *height,
struct gl_pixelstore_attrib *unpack)
{
const struct gl_framebuffer *buffer = ctx->DrawBuffer;
 
if (unpack->RowLength == 0) {
unpack->RowLength = *width;
}
 
ASSERT(ctx->Pixel.ZoomX == 1.0F);
ASSERT(ctx->Pixel.ZoomY == 1.0F || ctx->Pixel.ZoomY == -1.0F);
 
/* left clipping */
if (*destX < buffer->_Xmin) {
unpack->SkipPixels += (buffer->_Xmin - *destX);
*width -= (buffer->_Xmin - *destX);
*destX = buffer->_Xmin;
}
/* right clipping */
if (*destX + *width > buffer->_Xmax)
*width -= (*destX + *width - buffer->_Xmax);
 
if (*width <= 0)
return GL_FALSE;
 
if (ctx->Pixel.ZoomY == 1.0F) {
/* bottom clipping */
if (*destY < buffer->_Ymin) {
unpack->SkipRows += (buffer->_Ymin - *destY);
*height -= (buffer->_Ymin - *destY);
*destY = buffer->_Ymin;
}
/* top clipping */
if (*destY + *height > buffer->_Ymax)
*height -= (*destY + *height - buffer->_Ymax);
}
else { /* upside down */
/* top clipping */
if (*destY > buffer->_Ymax) {
unpack->SkipRows += (*destY - buffer->_Ymax);
*height -= (*destY - buffer->_Ymax);
*destY = buffer->_Ymax;
}
/* bottom clipping */
if (*destY - *height < buffer->_Ymin)
*height -= (buffer->_Ymin - (*destY - *height));
/* adjust destY so it's the first row to write to */
(*destY)--;
}
 
if (*height <= 0)
return GL_FALSE;
 
return GL_TRUE;
}
 
 
/**
* Perform clipping for glReadPixels. The image's window position
* and size, and the pack skipPixels, skipRows and rowLength are adjusted
* so that the image region is entirely within the window bounds.
* Note: this is different from _mesa_clip_drawpixels() in that the
* scissor box is ignored, and we use the bounds of the current readbuffer
* surface.
*
* \return GL_TRUE if image is ready for drawing or
* GL_FALSE if image was completely clipped away (draw nothing)
*/
GLboolean
_mesa_clip_readpixels(const struct gl_context *ctx,
GLint *srcX, GLint *srcY,
GLsizei *width, GLsizei *height,
struct gl_pixelstore_attrib *pack)
{
const struct gl_framebuffer *buffer = ctx->ReadBuffer;
 
if (pack->RowLength == 0) {
pack->RowLength = *width;
}
 
/* left clipping */
if (*srcX < 0) {
pack->SkipPixels += (0 - *srcX);
*width -= (0 - *srcX);
*srcX = 0;
}
/* right clipping */
if (*srcX + *width > (GLsizei) buffer->Width)
*width -= (*srcX + *width - buffer->Width);
 
if (*width <= 0)
return GL_FALSE;
 
/* bottom clipping */
if (*srcY < 0) {
pack->SkipRows += (0 - *srcY);
*height -= (0 - *srcY);
*srcY = 0;
}
/* top clipping */
if (*srcY + *height > (GLsizei) buffer->Height)
*height -= (*srcY + *height - buffer->Height);
 
if (*height <= 0)
return GL_FALSE;
 
return GL_TRUE;
}
 
 
/**
* Do clipping for a glCopyTexSubImage call.
* The framebuffer source region might extend outside the framebuffer
* bounds. Clip the source region against the framebuffer bounds and
* adjust the texture/dest position and size accordingly.
*
* \return GL_FALSE if region is totally clipped, GL_TRUE otherwise.
*/
GLboolean
_mesa_clip_copytexsubimage(const struct gl_context *ctx,
GLint *destX, GLint *destY,
GLint *srcX, GLint *srcY,
GLsizei *width, GLsizei *height)
{
const struct gl_framebuffer *fb = ctx->ReadBuffer;
const GLint srcX0 = *srcX, srcY0 = *srcY;
 
if (_mesa_clip_to_region(0, 0, fb->Width, fb->Height,
srcX, srcY, width, height)) {
*destX = *destX + *srcX - srcX0;
*destY = *destY + *srcY - srcY0;
 
return GL_TRUE;
}
else {
return GL_FALSE;
}
}
 
 
 
/**
* Clip the rectangle defined by (x, y, width, height) against the bounds
* specified by [xmin, xmax) and [ymin, ymax).
* \return GL_FALSE if rect is totally clipped, GL_TRUE otherwise.
*/
GLboolean
_mesa_clip_to_region(GLint xmin, GLint ymin,
GLint xmax, GLint ymax,
GLint *x, GLint *y,
GLsizei *width, GLsizei *height )
{
/* left clipping */
if (*x < xmin) {
*width -= (xmin - *x);
*x = xmin;
}
 
/* right clipping */
if (*x + *width > xmax)
*width -= (*x + *width - xmax);
 
if (*width <= 0)
return GL_FALSE;
 
/* bottom (or top) clipping */
if (*y < ymin) {
*height -= (ymin - *y);
*y = ymin;
}
 
/* top (or bottom) clipping */
if (*y + *height > ymax)
*height -= (*y + *height - ymax);
 
if (*height <= 0)
return GL_FALSE;
 
return GL_TRUE;
}
 
 
/**
* Clip dst coords against Xmax (or Ymax).
*/
static INLINE void
clip_right_or_top(GLint *srcX0, GLint *srcX1,
GLint *dstX0, GLint *dstX1,
GLint maxValue)
{
GLfloat t, bias;
 
if (*dstX1 > maxValue) {
/* X1 outside right edge */
ASSERT(*dstX0 < maxValue); /* X0 should be inside right edge */
t = (GLfloat) (maxValue - *dstX0) / (GLfloat) (*dstX1 - *dstX0);
/* chop off [t, 1] part */
ASSERT(t >= 0.0 && t <= 1.0);
*dstX1 = maxValue;
bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F;
*srcX1 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias);
}
else if (*dstX0 > maxValue) {
/* X0 outside right edge */
ASSERT(*dstX1 < maxValue); /* X1 should be inside right edge */
t = (GLfloat) (maxValue - *dstX1) / (GLfloat) (*dstX0 - *dstX1);
/* chop off [t, 1] part */
ASSERT(t >= 0.0 && t <= 1.0);
*dstX0 = maxValue;
bias = (*srcX0 < *srcX1) ? -0.5F : 0.5F;
*srcX0 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias);
}
}
 
 
/**
* Clip dst coords against Xmin (or Ymin).
*/
static INLINE void
clip_left_or_bottom(GLint *srcX0, GLint *srcX1,
GLint *dstX0, GLint *dstX1,
GLint minValue)
{
GLfloat t, bias;
 
if (*dstX0 < minValue) {
/* X0 outside left edge */
ASSERT(*dstX1 > minValue); /* X1 should be inside left edge */
t = (GLfloat) (minValue - *dstX0) / (GLfloat) (*dstX1 - *dstX0);
/* chop off [0, t] part */
ASSERT(t >= 0.0 && t <= 1.0);
*dstX0 = minValue;
bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F; /* flipped??? */
*srcX0 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias);
}
else if (*dstX1 < minValue) {
/* X1 outside left edge */
ASSERT(*dstX0 > minValue); /* X0 should be inside left edge */
t = (GLfloat) (minValue - *dstX1) / (GLfloat) (*dstX0 - *dstX1);
/* chop off [0, t] part */
ASSERT(t >= 0.0 && t <= 1.0);
*dstX1 = minValue;
bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F;
*srcX1 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias);
}
}
 
 
/**
* Do clipping of blit src/dest rectangles.
* The dest rect is clipped against both the buffer bounds and scissor bounds.
* The src rect is just clipped against the buffer bounds.
*
* When either the src or dest rect is clipped, the other is also clipped
* proportionately!
*
* Note that X0 need not be less than X1 (same for Y) for either the source
* and dest rects. That makes the clipping a little trickier.
*
* \return GL_TRUE if anything is left to draw, GL_FALSE if totally clipped
*/
GLboolean
_mesa_clip_blit(struct gl_context *ctx,
GLint *srcX0, GLint *srcY0, GLint *srcX1, GLint *srcY1,
GLint *dstX0, GLint *dstY0, GLint *dstX1, GLint *dstY1)
{
const GLint srcXmin = 0;
const GLint srcXmax = ctx->ReadBuffer->Width;
const GLint srcYmin = 0;
const GLint srcYmax = ctx->ReadBuffer->Height;
 
/* these include scissor bounds */
const GLint dstXmin = ctx->DrawBuffer->_Xmin;
const GLint dstXmax = ctx->DrawBuffer->_Xmax;
const GLint dstYmin = ctx->DrawBuffer->_Ymin;
const GLint dstYmax = ctx->DrawBuffer->_Ymax;
 
/*
printf("PreClipX: src: %d .. %d dst: %d .. %d\n",
*srcX0, *srcX1, *dstX0, *dstX1);
printf("PreClipY: src: %d .. %d dst: %d .. %d\n",
*srcY0, *srcY1, *dstY0, *dstY1);
*/
 
/* trivial rejection tests */
if (*dstX0 == *dstX1)
return GL_FALSE; /* no width */
if (*dstX0 <= dstXmin && *dstX1 <= dstXmin)
return GL_FALSE; /* totally out (left) of bounds */
if (*dstX0 >= dstXmax && *dstX1 >= dstXmax)
return GL_FALSE; /* totally out (right) of bounds */
 
if (*dstY0 == *dstY1)
return GL_FALSE;
if (*dstY0 <= dstYmin && *dstY1 <= dstYmin)
return GL_FALSE;
if (*dstY0 >= dstYmax && *dstY1 >= dstYmax)
return GL_FALSE;
 
if (*srcX0 == *srcX1)
return GL_FALSE;
if (*srcX0 <= srcXmin && *srcX1 <= srcXmin)
return GL_FALSE;
if (*srcX0 >= srcXmax && *srcX1 >= srcXmax)
return GL_FALSE;
 
if (*srcY0 == *srcY1)
return GL_FALSE;
if (*srcY0 <= srcYmin && *srcY1 <= srcYmin)
return GL_FALSE;
if (*srcY0 >= srcYmax && *srcY1 >= srcYmax)
return GL_FALSE;
 
/*
* dest clip
*/
clip_right_or_top(srcX0, srcX1, dstX0, dstX1, dstXmax);
clip_right_or_top(srcY0, srcY1, dstY0, dstY1, dstYmax);
clip_left_or_bottom(srcX0, srcX1, dstX0, dstX1, dstXmin);
clip_left_or_bottom(srcY0, srcY1, dstY0, dstY1, dstYmin);
 
/*
* src clip (just swap src/dst values from above)
*/
clip_right_or_top(dstX0, dstX1, srcX0, srcX1, srcXmax);
clip_right_or_top(dstY0, dstY1, srcY0, srcY1, srcYmax);
clip_left_or_bottom(dstX0, dstX1, srcX0, srcX1, srcXmin);
clip_left_or_bottom(dstY0, dstY1, srcY0, srcY1, srcYmin);
 
/*
printf("PostClipX: src: %d .. %d dst: %d .. %d\n",
*srcX0, *srcX1, *dstX0, *dstX1);
printf("PostClipY: src: %d .. %d dst: %d .. %d\n",
*srcY0, *srcY1, *dstY0, *dstY1);
*/
 
ASSERT(*dstX0 >= dstXmin);
ASSERT(*dstX0 <= dstXmax);
ASSERT(*dstX1 >= dstXmin);
ASSERT(*dstX1 <= dstXmax);
 
ASSERT(*dstY0 >= dstYmin);
ASSERT(*dstY0 <= dstYmax);
ASSERT(*dstY1 >= dstYmin);
ASSERT(*dstY1 <= dstYmax);
 
ASSERT(*srcX0 >= srcXmin);
ASSERT(*srcX0 <= srcXmax);
ASSERT(*srcX1 >= srcXmin);
ASSERT(*srcX1 <= srcXmax);
 
ASSERT(*srcY0 >= srcYmin);
ASSERT(*srcY0 <= srcYmax);
ASSERT(*srcY1 >= srcYmin);
ASSERT(*srcY1 <= srcYmax);
 
return GL_TRUE;
}