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reactos/dll/opengl/mesa/teximage.c
Jérôme Gardou 5f2bebf7a5 [OPENGL32][MESA] Downgrade Mesa library to version 2.6 
With this commit, we now use a forked version of MESA which only supports OpenGL 1.1, like the windows implementation does.
It exposes :
  - The same pixel formats
  - The same set of extensions
  - Nothing more
All of this without taking 10% of your build time.
If you need a more modern option, look at the MESA package from Rapps, which is (and must be) maintained outside of this code tree.
CORE-7499
2019-01-19 14:23:54 +01:00

1890 lines
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/* $Id: teximage.c,v 1.35 1998/02/07 14:36:41 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 2.6
* Copyright (C) 1995-1997 Brian Paul
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* $Log: teximage.c,v $
* Revision 1.35 1998/02/07 14:36:41 brianp
* fixed bug when passing NULL proxy image to glTexImageXD() (Wes Bethel)
*
* Revision 1.34 1998/01/16 03:46:07 brianp
* fixed a few Windows compilation warnings (Theodore Jump)
*
* Revision 1.33 1997/12/31 06:10:03 brianp
* added Henk Kok's texture validation optimization (AnyDirty flag)
*
* Revision 1.32 1997/12/07 17:30:39 brianp
* added DavidB's patches for v0.21 driver (TexSubImage)
*
* Revision 1.31 1997/11/07 03:38:07 brianp
* added stdio.h include for SunOS 4.x
*
* Revision 1.30 1997/11/02 20:20:30 brianp
* rewrote gl_TexSubImage[123]D()
*
* Revision 1.29 1997/10/16 01:14:04 brianp
* removed teximage Dirty flag
*
* Revision 1.28 1997/10/14 00:40:20 brianp
* added DavidB's v19 fxmesa changes
*
* Revision 1.27 1997/09/29 23:28:14 brianp
* updated for new device driver texture functions
*
* Revision 1.26 1997/09/28 15:29:03 brianp
* initialize image->Depth = 1 in read_color_image() (Hiroki Honda)
*
* Revision 1.25 1997/09/27 00:14:39 brianp
* added GL_EXT_paletted_texture extension
*
* Revision 1.24 1997/09/03 13:17:17 brianp
* added a few pointer casts
*
* Revision 1.23 1997/08/23 18:40:46 brianp
* glTexImage[123]D() with NULL image pointer is correctly handled now
*
* Revision 1.22 1997/08/11 01:23:29 brianp
* added a few pointer casts
*
* Revision 1.21 1997/07/24 01:25:34 brianp
* changed precompiled header symbol from PCH to PC_HEADER
*
* Revision 1.20 1997/07/05 16:21:17 brianp
* fixed unitialized variable bug in gl_TexSubImage1D()
*
* Revision 1.19 1997/06/24 01:13:53 brianp
* call gl_free_image() in gl_TexSubImage[123]D() if ref count==0
*
* Revision 1.18 1997/06/04 00:33:14 brianp
* fixed reference count bug in gl_CopyTexImage1/2D() (Randy Frank)
*
* Revision 1.17 1997/05/28 03:26:49 brianp
* added precompiled header (PCH) support
*
* Revision 1.16 1997/05/03 00:52:19 brianp
* set texture object Dirty flag when changing texture image
*
* Revision 1.15 1997/04/20 20:29:11 brianp
* replaced abort() with gl_problem()
*
* Revision 1.14 1997/03/04 19:18:29 brianp
* added texture image Width2, Height2, and Depth2 fields
*
* Revision 1.13 1997/02/27 19:58:08 brianp
* call gl_problem() instead of gl_warning()
*
* Revision 1.12 1997/02/09 18:53:05 brianp
* added GL_EXT_texture3D support
*
* Revision 1.11 1997/01/16 03:35:10 brianp
* added calls to device driver TexImage() function
*
* Revision 1.10 1997/01/09 21:26:46 brianp
* gl_TexImage[12]D() didn't free the incoming image- a memory leak
*
* Revision 1.9 1997/01/09 19:55:52 brianp
* fixed a few error messages
*
* Revision 1.8 1997/01/09 19:49:18 brianp
* better error checking
*
* Revision 1.7 1996/12/02 18:59:54 brianp
* added code to handle GL_COLOR_INDEX textures, per Randy Frank
*
* Revision 1.6 1996/11/07 04:13:24 brianp
* all new texture image handling, now pixel scale, bias, mapping work
*
* Revision 1.5 1996/09/27 01:29:57 brianp
* removed unused variables, fixed cut&paste bug in color scaling
*
* Revision 1.4 1996/09/26 22:35:10 brianp
* fixed a few compiler warnings from IRIX 6 -n32 and -64 compiler
*
* Revision 1.3 1996/09/15 14:18:55 brianp
* now use GLframebuffer and GLvisual
*
* Revision 1.2 1996/09/15 01:48:58 brianp
* removed #define NULL 0
*
* Revision 1.1 1996/09/13 01:38:16 brianp
* Initial revision
*
*/
#ifdef PC_HEADER
#include "all.h"
#else
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "context.h"
#include "image.h"
#include "macros.h"
#include "pixel.h"
#include "span.h"
#include "teximage.h"
#include "types.h"
#endif
/*
* NOTES:
*
* The internal texture storage convension is an array of N GLubytes
* where N = width * height * components. There is no padding.
*/
/*
* Compute log base 2 of n.
* If n isn't an exact power of two return -1.
* If n<0 return -1.
*/
static int logbase2( int n )
{
GLint i = 1;
GLint log2 = 0;
if (n<0) {
return -1;
}
while ( n > i ) {
i *= 2;
log2++;
}
if (i != n) {
return -1;
}
else {
return log2;
}
}
/*
* Given an internal texture format enum or 1, 2, 3, 4 return the
* corresponding _base_ internal format: GL_ALPHA, GL_LUMINANCE,
* GL_LUMANCE_ALPHA, GL_INTENSITY, GL_RGB, or GL_RGBA. Return -1 if
* invalid enum.
*/
static GLint decode_internal_format( GLint format )
{
switch (format) {
case GL_ALPHA:
case GL_ALPHA4:
case GL_ALPHA8:
case GL_ALPHA12:
case GL_ALPHA16:
return GL_ALPHA;
case 1:
case GL_LUMINANCE:
case GL_LUMINANCE4:
case GL_LUMINANCE8:
case GL_LUMINANCE12:
case GL_LUMINANCE16:
return GL_LUMINANCE;
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:
return GL_LUMINANCE_ALPHA;
case GL_INTENSITY:
case GL_INTENSITY4:
case GL_INTENSITY8:
case GL_INTENSITY12:
case GL_INTENSITY16:
return GL_INTENSITY;
case 3:
case GL_RGB:
case GL_R3_G3_B2:
case GL_RGB4:
case GL_RGB5:
case GL_RGB8:
case GL_RGB10:
case GL_RGB12:
case GL_RGB16:
return GL_RGB;
case 4:
case GL_RGBA:
case GL_RGBA2:
case GL_RGBA4:
case GL_RGB5_A1:
case GL_RGBA8:
case GL_RGB10_A2:
case GL_RGBA12:
case GL_RGBA16:
return GL_RGBA;
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_COLOR_INDEX;
default:
return -1; /* error */
}
}
/*
* Given an internal texture format enum or 1, 2, 3, 4 return the
* corresponding _base_ internal format: GL_ALPHA, GL_LUMINANCE,
* GL_LUMANCE_ALPHA, GL_INTENSITY, GL_RGB, or GL_RGBA. Return the
* number of components for the format. Return -1 if invalid enum.
*/
static GLint components_in_intformat( GLint format )
{
switch (format) {
case GL_ALPHA:
case GL_ALPHA4:
case GL_ALPHA8:
case GL_ALPHA12:
case GL_ALPHA16:
return 1;
case 1:
case GL_LUMINANCE:
case GL_LUMINANCE4:
case GL_LUMINANCE8:
case GL_LUMINANCE12:
case GL_LUMINANCE16:
return 1;
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:
return 2;
case GL_INTENSITY:
case GL_INTENSITY4:
case GL_INTENSITY8:
case GL_INTENSITY12:
case GL_INTENSITY16:
return 1;
case 3:
case GL_RGB:
case GL_R3_G3_B2:
case GL_RGB4:
case GL_RGB5:
case GL_RGB8:
case GL_RGB10:
case GL_RGB12:
case GL_RGB16:
return 3;
case 4:
case GL_RGBA:
case GL_RGBA2:
case GL_RGBA4:
case GL_RGB5_A1:
case GL_RGBA8:
case GL_RGB10_A2:
case GL_RGBA12:
case GL_RGBA16:
return 4;
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 1;
default:
return -1; /* error */
}
}
struct gl_texture_image *gl_alloc_texture_image( void )
{
return (struct gl_texture_image *) calloc( 1, sizeof(struct gl_texture_image) );
}
void gl_free_texture_image( struct gl_texture_image *teximage )
{
if (teximage->Data) {
free( teximage->Data );
}
free( teximage );
}
/*
* Given a gl_image, apply the pixel transfer scale, bias, and mapping
* to produce a gl_texture_image. Convert image data to GLubytes.
* Input: image - the incoming gl_image
* internalFormat - desired format of resultant texture
* border - texture border width (0 or 1)
* Return: pointer to a gl_texture_image or NULL if an error occurs.
*/
static struct gl_texture_image *
image_to_texture( GLcontext *ctx, const struct gl_image *image,
GLenum internalFormat, GLint border )
{
GLint components;
struct gl_texture_image *texImage;
GLint numPixels, pixel;
GLboolean scaleOrBias;
assert(image);
assert(image->Width>0);
assert(image->Height>0);
/* internalFormat = decode_internal_format(internalFormat);*/
components = components_in_intformat(internalFormat);
numPixels = image->Width * image->Height;
texImage = gl_alloc_texture_image();
if (!texImage)
return NULL;
texImage->Format = decode_internal_format(internalFormat);
texImage->IntFormat = internalFormat;
texImage->Border = border;
texImage->Width = image->Width;
texImage->Height = image->Height;
texImage->WidthLog2 = logbase2(image->Width - 2*border);
if (image->Height==1) /* 1-D texture */
texImage->HeightLog2 = 0;
else
texImage->HeightLog2 = logbase2(image->Height - 2*border);
texImage->Width2 = 1 << texImage->WidthLog2;
texImage->Height2 = 1 << texImage->HeightLog2;
texImage->MaxLog2 = MAX2( texImage->WidthLog2, texImage->HeightLog2 );
texImage->Data = (GLubyte *) malloc( numPixels * components );
assert(texImage->WidthLog2>=0);
assert(texImage->HeightLog2>=0);
if (!texImage->Data) {
/* out of memory */
gl_free_texture_image( texImage );
return NULL;
}
/* Determine if scaling and/or biasing is needed */
if (ctx->Pixel.RedScale!=1.0F || ctx->Pixel.RedBias!=0.0F ||
ctx->Pixel.GreenScale!=1.0F || ctx->Pixel.GreenBias!=0.0F ||
ctx->Pixel.BlueScale!=1.0F || ctx->Pixel.BlueBias!=0.0F ||
ctx->Pixel.AlphaScale!=1.0F || ctx->Pixel.AlphaBias!=0.0F) {
scaleOrBias = GL_TRUE;
}
else {
scaleOrBias = GL_FALSE;
}
switch (image->Type) {
case GL_BITMAP:
{
GLint shift = ctx->Pixel.IndexShift;
GLint offset = ctx->Pixel.IndexOffset;
/* MapIto[RGBA]Size must be powers of two */
GLint rMask = ctx->Pixel.MapItoRsize-1;
GLint gMask = ctx->Pixel.MapItoGsize-1;
GLint bMask = ctx->Pixel.MapItoBsize-1;
GLint aMask = ctx->Pixel.MapItoAsize-1;
GLint i, j;
GLubyte *srcPtr = (GLubyte *) image->Data;
assert( image->Format==GL_COLOR_INDEX );
for (j=0; j<image->Height; j++) {
GLubyte bitMask = 128;
for (i=0; i<image->Width; i++) {
GLint index;
GLubyte red, green, blue, alpha;
/* Fetch image color index */
index = (*srcPtr & bitMask) ? 1 : 0;
bitMask = bitMask >> 1;
if (bitMask==0) {
bitMask = 128;
srcPtr++;
}
/* apply index shift and offset */
if (shift>=0) {
index = (index << shift) + offset;
}
else {
index = (index >> -shift) + offset;
}
/* convert index to RGBA */
red = (GLint) (ctx->Pixel.MapItoR[index & rMask] * 255.0F);
green = (GLint) (ctx->Pixel.MapItoG[index & gMask] * 255.0F);
blue = (GLint) (ctx->Pixel.MapItoB[index & bMask] * 255.0F);
alpha = (GLint) (ctx->Pixel.MapItoA[index & aMask] * 255.0F);
/* store texel (components are GLubytes in [0,255]) */
pixel = j * image->Width + i;
switch (texImage->Format) {
case GL_ALPHA:
texImage->Data[pixel] = alpha;
break;
case GL_LUMINANCE:
texImage->Data[pixel] = red;
break;
case GL_LUMINANCE_ALPHA:
texImage->Data[pixel*2+0] = red;
texImage->Data[pixel*2+1] = alpha;
break;
case GL_INTENSITY:
texImage->Data[pixel] = red;
break;
case GL_RGB:
texImage->Data[pixel*3+0] = red;
texImage->Data[pixel*3+1] = green;
texImage->Data[pixel*3+2] = blue;
break;
case GL_RGBA:
texImage->Data[pixel*4+0] = red;
texImage->Data[pixel*4+1] = green;
texImage->Data[pixel*4+2] = blue;
texImage->Data[pixel*4+3] = alpha;
break;
default:
gl_problem(ctx,"Bad format in image_to_texture");
return NULL;
}
}
if (bitMask!=128) {
srcPtr++;
}
}
}
break;
case GL_UNSIGNED_BYTE:
for (pixel=0; pixel<numPixels; pixel++) {
GLubyte red, green, blue, alpha;
switch (image->Format) {
case GL_COLOR_INDEX:
if (decode_internal_format(internalFormat)==GL_COLOR_INDEX) {
/* a paletted texture */
GLint index = ((GLubyte*)image->Data)[pixel];
red = index;
}
else {
/* convert color index to RGBA */
GLint index = ((GLubyte*)image->Data)[pixel];
red = 255.0F * ctx->Pixel.MapItoR[index];
green = 255.0F * ctx->Pixel.MapItoG[index];
blue = 255.0F * ctx->Pixel.MapItoB[index];
alpha = 255.0F * ctx->Pixel.MapItoA[index];
}
break;
case GL_RGB:
/* Fetch image RGBA values */
red = ((GLubyte*) image->Data)[pixel*3+0];
green = ((GLubyte*) image->Data)[pixel*3+1];
blue = ((GLubyte*) image->Data)[pixel*3+2];
alpha = 255;
break;
case GL_BGR_EXT:
blue = ((GLubyte*) image->Data)[pixel*3+0];
green = ((GLubyte*) image->Data)[pixel*3+1];
red = ((GLubyte*) image->Data)[pixel*3+2];
alpha = 255;
break;
case GL_RGBA:
red = ((GLubyte*) image->Data)[pixel*4+0];
green = ((GLubyte*) image->Data)[pixel*4+1];
blue = ((GLubyte*) image->Data)[pixel*4+2];
alpha = ((GLubyte*) image->Data)[pixel*4+3];
break;
case GL_BGRA_EXT:
blue = ((GLubyte*) image->Data)[pixel*4+0];
green = ((GLubyte*) image->Data)[pixel*4+1];
red = ((GLubyte*) image->Data)[pixel*4+2];
alpha = ((GLubyte*) image->Data)[pixel*4+3];
break;
case GL_RED:
red = ((GLubyte*) image->Data)[pixel];
green = 0;
blue = 0;
alpha = 255;
break;
case GL_GREEN:
red = 0;
green = ((GLubyte*) image->Data)[pixel];
blue = 0;
alpha = 255;
break;
case GL_BLUE:
red = 0;
green = 0;
blue = ((GLubyte*) image->Data)[pixel];
alpha = 255;
break;
case GL_ALPHA:
red = 0;
green = 0;
blue = 0;
alpha = ((GLubyte*) image->Data)[pixel];
break;
case GL_LUMINANCE:
red = ((GLubyte*) image->Data)[pixel];
green = red;
blue = red;
alpha = 255;
break;
case GL_LUMINANCE_ALPHA:
red = ((GLubyte*) image->Data)[pixel*2+0];
green = red;
blue = red;
alpha = ((GLubyte*) image->Data)[pixel*2+1];
break;
default:
gl_problem(ctx,"Bad format (2) in image_to_texture");
return NULL;
}
if (scaleOrBias || ctx->Pixel.MapColorFlag) {
/* Apply RGBA scale and bias */
GLfloat r = red * (1.0F/255.0F);
GLfloat g = green * (1.0F/255.0F);
GLfloat b = blue * (1.0F/255.0F);
GLfloat a = alpha * (1.0F/255.0F);
if (scaleOrBias) {
/* r,g,b,a now in [0,1] */
r = r * ctx->Pixel.RedScale + ctx->Pixel.RedBias;
g = g * ctx->Pixel.GreenScale + ctx->Pixel.GreenBias;
b = b * ctx->Pixel.BlueScale + ctx->Pixel.BlueBias;
a = a * ctx->Pixel.AlphaScale + ctx->Pixel.AlphaBias;
r = CLAMP( r, 0.0F, 1.0F );
g = CLAMP( g, 0.0F, 1.0F );
b = CLAMP( b, 0.0F, 1.0F );
a = CLAMP( a, 0.0F, 1.0F );
}
/* Apply pixel maps */
if (ctx->Pixel.MapColorFlag) {
GLint ir = (GLint) (r*ctx->Pixel.MapRtoRsize);
GLint ig = (GLint) (g*ctx->Pixel.MapGtoGsize);
GLint ib = (GLint) (b*ctx->Pixel.MapBtoBsize);
GLint ia = (GLint) (a*ctx->Pixel.MapAtoAsize);
r = ctx->Pixel.MapRtoR[ir];
g = ctx->Pixel.MapGtoG[ig];
b = ctx->Pixel.MapBtoB[ib];
a = ctx->Pixel.MapAtoA[ia];
}
red = (GLint) (r * 255.0F);
green = (GLint) (g * 255.0F);
blue = (GLint) (b * 255.0F);
alpha = (GLint) (a * 255.0F);
}
/* store texel (components are GLubytes in [0,255]) */
switch (texImage->Format) {
case GL_COLOR_INDEX:
texImage->Data[pixel] = red; /* really an index */
break;
case GL_ALPHA:
texImage->Data[pixel] = alpha;
break;
case GL_LUMINANCE:
texImage->Data[pixel] = red;
break;
case GL_LUMINANCE_ALPHA:
texImage->Data[pixel*2+0] = red;
texImage->Data[pixel*2+1] = alpha;
break;
case GL_INTENSITY:
texImage->Data[pixel] = red;
break;
case GL_RGB:
texImage->Data[pixel*3+0] = red;
texImage->Data[pixel*3+1] = green;
texImage->Data[pixel*3+2] = blue;
break;
case GL_RGBA:
texImage->Data[pixel*4+0] = red;
texImage->Data[pixel*4+1] = green;
texImage->Data[pixel*4+2] = blue;
texImage->Data[pixel*4+3] = alpha;
break;
default:
gl_problem(ctx,"Bad format (3) in image_to_texture");
return NULL;
}
}
break;
case GL_FLOAT:
for (pixel=0; pixel<numPixels; pixel++) {
GLfloat red, green, blue, alpha;
switch (texImage->Format) {
case GL_COLOR_INDEX:
if (decode_internal_format(internalFormat)==GL_COLOR_INDEX) {
/* a paletted texture */
GLint index = (GLint) ((GLfloat*) image->Data)[pixel];
red = index;
}
else {
GLint shift = ctx->Pixel.IndexShift;
GLint offset = ctx->Pixel.IndexOffset;
/* MapIto[RGBA]Size must be powers of two */
GLint rMask = ctx->Pixel.MapItoRsize-1;
GLint gMask = ctx->Pixel.MapItoGsize-1;
GLint bMask = ctx->Pixel.MapItoBsize-1;
GLint aMask = ctx->Pixel.MapItoAsize-1;
/* Fetch image color index */
GLint index = (GLint) ((GLfloat*) image->Data)[pixel];
/* apply index shift and offset */
if (shift>=0) {
index = (index << shift) + offset;
}
else {
index = (index >> -shift) + offset;
}
/* convert index to RGBA */
red = ctx->Pixel.MapItoR[index & rMask];
green = ctx->Pixel.MapItoG[index & gMask];
blue = ctx->Pixel.MapItoB[index & bMask];
alpha = ctx->Pixel.MapItoA[index & aMask];
}
break;
case GL_RGB:
/* Fetch image RGBA values */
red = ((GLfloat*) image->Data)[pixel*3+0];
green = ((GLfloat*) image->Data)[pixel*3+1];
blue = ((GLfloat*) image->Data)[pixel*3+2];
alpha = 1.0;
break;
case GL_RGBA:
red = ((GLfloat*) image->Data)[pixel*4+0];
green = ((GLfloat*) image->Data)[pixel*4+1];
blue = ((GLfloat*) image->Data)[pixel*4+2];
alpha = ((GLfloat*) image->Data)[pixel*4+3];
break;
case GL_RED:
red = ((GLfloat*) image->Data)[pixel];
green = 0.0;
blue = 0.0;
alpha = 1.0;
break;
case GL_GREEN:
red = 0.0;
green = ((GLfloat*) image->Data)[pixel];
blue = 0.0;
alpha = 1.0;
break;
case GL_BLUE:
red = 0.0;
green = 0.0;
blue = ((GLfloat*) image->Data)[pixel];
alpha = 1.0;
break;
case GL_ALPHA:
red = 0.0;
green = 0.0;
blue = 0.0;
alpha = ((GLfloat*) image->Data)[pixel];
break;
case GL_LUMINANCE:
red = ((GLfloat*) image->Data)[pixel];
green = red;
blue = red;
alpha = 1.0;
break;
case GL_LUMINANCE_ALPHA:
red = ((GLfloat*) image->Data)[pixel*2+0];
green = red;
blue = red;
alpha = ((GLfloat*) image->Data)[pixel*2+1];
break;
default:
gl_problem(ctx,"Bad format (4) in image_to_texture");
return NULL;
}
if (image->Format!=GL_COLOR_INDEX) {
/* Apply RGBA scale and bias */
if (scaleOrBias) {
red = red * ctx->Pixel.RedScale + ctx->Pixel.RedBias;
green = green * ctx->Pixel.GreenScale + ctx->Pixel.GreenBias;
blue = blue * ctx->Pixel.BlueScale + ctx->Pixel.BlueBias;
alpha = alpha * ctx->Pixel.AlphaScale + ctx->Pixel.AlphaBias;
red = CLAMP( red, 0.0F, 1.0F );
green = CLAMP( green, 0.0F, 1.0F );
blue = CLAMP( blue, 0.0F, 1.0F );
alpha = CLAMP( alpha, 0.0F, 1.0F );
}
/* Apply pixel maps */
if (ctx->Pixel.MapColorFlag) {
GLint ir = (GLint) (red *ctx->Pixel.MapRtoRsize);
GLint ig = (GLint) (green*ctx->Pixel.MapGtoGsize);
GLint ib = (GLint) (blue *ctx->Pixel.MapBtoBsize);
GLint ia = (GLint) (alpha*ctx->Pixel.MapAtoAsize);
red = ctx->Pixel.MapRtoR[ir];
green = ctx->Pixel.MapGtoG[ig];
blue = ctx->Pixel.MapBtoB[ib];
alpha = ctx->Pixel.MapAtoA[ia];
}
}
/* store texel (components are GLubytes in [0,255]) */
switch (texImage->Format) {
case GL_COLOR_INDEX:
/* a paletted texture */
texImage->Data[pixel] = (GLint) (red * 255.0F);
break;
case GL_ALPHA:
texImage->Data[pixel] = (GLint) (alpha * 255.0F);
break;
case GL_LUMINANCE:
texImage->Data[pixel] = (GLint) (red * 255.0F);
break;
case GL_LUMINANCE_ALPHA:
texImage->Data[pixel*2+0] = (GLint) (red * 255.0F);
texImage->Data[pixel*2+1] = (GLint) (alpha * 255.0F);
break;
case GL_INTENSITY:
texImage->Data[pixel] = (GLint) (red * 255.0F);
break;
case GL_RGB:
texImage->Data[pixel*3+0] = (GLint) (red * 255.0F);
texImage->Data[pixel*3+1] = (GLint) (green * 255.0F);
texImage->Data[pixel*3+2] = (GLint) (blue * 255.0F);
break;
case GL_RGBA:
texImage->Data[pixel*4+0] = (GLint) (red * 255.0F);
texImage->Data[pixel*4+1] = (GLint) (green * 255.0F);
texImage->Data[pixel*4+2] = (GLint) (blue * 255.0F);
texImage->Data[pixel*4+3] = (GLint) (alpha * 255.0F);
break;
default:
gl_problem(ctx,"Bad format (5) in image_to_texture");
return NULL;
}
}
break;
default:
gl_problem(ctx, "Bad image type in image_to_texture");
return NULL;
}
return texImage;
}
/*
* glTexImage[123]D can accept a NULL image pointer. In this case we
* create a texture image with unspecified image contents per the OpenGL
* spec.
*/
static struct gl_texture_image *
make_null_texture( GLcontext *ctx, GLenum internalFormat,
GLsizei width, GLsizei height, GLsizei depth, GLint border )
{
GLint components;
struct gl_texture_image *texImage;
GLint numPixels;
/*internalFormat = decode_internal_format(internalFormat);*/
components = components_in_intformat(internalFormat);
numPixels = width * height * depth;
texImage = gl_alloc_texture_image();
if (!texImage)
return NULL;
texImage->Format = decode_internal_format(internalFormat);
texImage->IntFormat = internalFormat;
texImage->Border = border;
texImage->Width = width;
texImage->Height = height;
texImage->WidthLog2 = logbase2(width - 2*border);
if (height==1) /* 1-D texture */
texImage->HeightLog2 = 0;
else
texImage->HeightLog2 = logbase2(height - 2*border);
texImage->Width2 = 1 << texImage->WidthLog2;
texImage->Height2 = 1 << texImage->HeightLog2;
texImage->MaxLog2 = MAX2( texImage->WidthLog2, texImage->HeightLog2 );
/* XXX should we really allocate memory for the image or let it be NULL? */
/*texImage->Data = NULL;*/
texImage->Data = (GLubyte *) malloc( numPixels * components );
/*
* Let's see if anyone finds this. If glTexImage2D() is called with
* a NULL image pointer then load the texture image with something
* interesting instead of leaving it indeterminate.
*/
if (texImage->Data) {
char message[8][32] = {
" X X XXXXX XXX X ",
" XX XX X X X X X ",
" X X X X X X X ",
" X X XXXX XXX XXXXX ",
" X X X X X X ",
" X X X X X X X ",
" X X XXXXX XXX X X ",
" "
};
GLubyte *imgPtr = texImage->Data;
GLint i, j, k;
for (i=0;i<height;i++) {
GLint srcRow = 7 - i % 8;
for (j=0;j<width;j++) {
GLint srcCol = j % 32;
GLubyte texel = (message[srcRow][srcCol]=='X') ? 255 : 70;
for (k=0;k<components;k++) {
*imgPtr++ = texel;
}
}
}
}
return texImage;
}
/*
* Test glTexImagee1D() parameters for errors.
* Return: GL_TRUE = an error was detected, GL_FALSE = no errors
*/
static GLboolean texture_1d_error_check( GLcontext *ctx, GLenum target,
GLint level, GLenum internalFormat,
GLenum format, GLenum type,
GLint width, GLint border )
{
GLint iformat;
if (target!=GL_TEXTURE_1D && target!=GL_PROXY_TEXTURE_1D) {
gl_error( ctx, GL_INVALID_ENUM, "glTexImage1D" );
return GL_TRUE;
}
if (level<0 || level>=MAX_TEXTURE_LEVELS) {
gl_error( ctx, GL_INVALID_VALUE, "glTexImage1D(level)" );
return GL_TRUE;
}
iformat = decode_internal_format( internalFormat );
if (iformat<0) {
gl_error( ctx, GL_INVALID_VALUE, "glTexImage1D(internalFormat)" );
return GL_TRUE;
}
if (border!=0 && border!=1) {
if (target!=GL_PROXY_TEXTURE_1D) {
gl_error( ctx, GL_INVALID_VALUE, "glTexImage1D(border)" );
}
return GL_TRUE;
}
if (width<2*border || width>2+MAX_TEXTURE_SIZE) {
if (target!=GL_PROXY_TEXTURE_1D) {
gl_error( ctx, GL_INVALID_VALUE, "glTexImage1D(width)" );
}
return GL_TRUE;
}
if (logbase2( width-2*border )<0) {
gl_error( ctx, GL_INVALID_VALUE,
"glTexImage1D(width != 2^k + 2*border)");
return GL_TRUE;
}
switch (format) {
case GL_COLOR_INDEX:
case GL_RED:
case GL_GREEN:
case GL_BLUE:
case GL_ALPHA:
case GL_RGB:
case GL_BGR_EXT:
case GL_RGBA:
case GL_BGRA_EXT:
case GL_LUMINANCE:
case GL_LUMINANCE_ALPHA:
/* OK */
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glTexImage1D(format)" );
return GL_TRUE;
}
switch (type) {
case GL_UNSIGNED_BYTE:
case GL_BYTE:
case GL_UNSIGNED_SHORT:
case GL_SHORT:
case GL_FLOAT:
/* OK */
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glTexImage1D(type)" );
return GL_TRUE;
}
return GL_FALSE;
}
/*
* Test glTexImagee2D() parameters for errors.
* Return: GL_TRUE = an error was detected, GL_FALSE = no errors
*/
static GLboolean texture_2d_error_check( GLcontext *ctx, GLenum target,
GLint level, GLenum internalFormat,
GLenum format, GLenum type,
GLint width, GLint height,
GLint border )
{
GLint iformat;
if (target!=GL_TEXTURE_2D && target!=GL_PROXY_TEXTURE_2D) {
gl_error( ctx, GL_INVALID_ENUM, "glTexImage2D(target)" );
return GL_TRUE;
}
if (level<0 || level>=MAX_TEXTURE_LEVELS) {
gl_error( ctx, GL_INVALID_VALUE, "glTexImage2D(level)" );
return GL_TRUE;
}
iformat = decode_internal_format( internalFormat );
if (iformat<0) {
gl_error( ctx, GL_INVALID_VALUE, "glTexImage2D(internalFormat)" );
return GL_TRUE;
}
if (border!=0 && border!=1) {
if (target!=GL_PROXY_TEXTURE_2D) {
gl_error( ctx, GL_INVALID_VALUE, "glTexImage2D(border)" );
}
return GL_TRUE;
}
if (width<2*border || width>2+MAX_TEXTURE_SIZE) {
if (target!=GL_PROXY_TEXTURE_2D) {
gl_error( ctx, GL_INVALID_VALUE, "glTexImage2D(width)" );
}
return GL_TRUE;
}
if (height<2*border || height>2+MAX_TEXTURE_SIZE) {
if (target!=GL_PROXY_TEXTURE_2D) {
gl_error( ctx, GL_INVALID_VALUE, "glTexImage2D(height)" );
}
return GL_TRUE;
}
if (logbase2( width-2*border )<0) {
gl_error( ctx,GL_INVALID_VALUE,
"glTexImage2D(width != 2^k + 2*border)");
return GL_TRUE;
}
if (logbase2( height-2*border )<0) {
gl_error( ctx,GL_INVALID_VALUE,
"glTexImage2D(height != 2^k + 2*border)");
return GL_TRUE;
}
switch (format) {
case GL_COLOR_INDEX:
case GL_RED:
case GL_GREEN:
case GL_BLUE:
case GL_ALPHA:
case GL_RGB:
case GL_BGR_EXT:
case GL_RGBA:
case GL_BGRA_EXT:
case GL_LUMINANCE:
case GL_LUMINANCE_ALPHA:
/* OK */
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glTexImage2D(format)" );
return GL_TRUE;
}
switch (type) {
case GL_UNSIGNED_BYTE:
case GL_BYTE:
case GL_UNSIGNED_SHORT:
case GL_SHORT:
case GL_UNSIGNED_INT:
case GL_INT:
case GL_FLOAT:
/* OK */
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glTexImage2D(type)" );
return GL_TRUE;
}
return GL_FALSE;
}
/*
* Called from the API. Note that width includes the border.
*/
void gl_TexImage1D( GLcontext *ctx,
GLenum target, GLint level, GLint internalformat,
GLsizei width, GLint border, GLenum format,
GLenum type, struct gl_image *image )
{
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glTexImage1D" );
return;
}
if (target==GL_TEXTURE_1D) {
struct gl_texture_image *teximage;
if (texture_1d_error_check( ctx, target, level, internalformat,
format, type, width, border )) {
/* error in texture image was detected */
return;
}
/* free current texture image, if any */
if (ctx->Texture.Current1D->Image[level]) {
gl_free_texture_image( ctx->Texture.Current1D->Image[level] );
}
/* make new texture from source image */
if (image) {
teximage = image_to_texture(ctx, image, internalformat, border);
}
else {
teximage = make_null_texture(ctx, internalformat,
width, 1, 1, border);
}
/* install new texture image */
ctx->Texture.Current1D->Image[level] = teximage;
ctx->Texture.Current1D->Dirty = GL_TRUE;
ctx->Texture.AnyDirty = GL_TRUE;
ctx->NewState |= NEW_TEXTURING;
/* free the source image */
if (image && image->RefCount==0) {
/* if RefCount>0 then image must be in a display list */
gl_free_image(image);
}
/* tell driver about change */
if (ctx->Driver.TexImage) {
(*ctx->Driver.TexImage)( ctx, GL_TEXTURE_1D,
ctx->Texture.Current1D,
level, internalformat, teximage );
}
}
else if (target==GL_PROXY_TEXTURE_1D) {
/* Proxy texture: check for errors and update proxy state */
if (texture_1d_error_check( ctx, target, level, internalformat,
format, type, width, border )) {
if (level>=0 && level<MAX_TEXTURE_LEVELS) {
MEMSET( ctx->Texture.Proxy1D->Image[level], 0,
sizeof(struct gl_texture_image) );
}
}
else {
ctx->Texture.Proxy1D->Image[level]->Format = internalformat;
ctx->Texture.Proxy1D->Image[level]->Border = border;
ctx->Texture.Proxy1D->Image[level]->Width = width;
ctx->Texture.Proxy1D->Image[level]->Height = 1;
}
if (image && image->RefCount==0) {
/* if RefCount>0 then image must be in a display list */
gl_free_image(image);
}
}
else {
gl_error( ctx, GL_INVALID_ENUM, "glTexImage1D(target)" );
return;
}
}
/*
* Called by the API or display list executor.
* Note that width and height include the border.
*/
void gl_TexImage2D( GLcontext *ctx,
GLenum target, GLint level, GLint internalformat,
GLsizei width, GLsizei height, GLint border,
GLenum format, GLenum type,
struct gl_image *image )
{
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glTexImage2D" );
return;
}
if (target==GL_TEXTURE_2D) {
struct gl_texture_image *teximage;
if (texture_2d_error_check( ctx, target, level, internalformat,
format, type, width, height, border )) {
/* error in texture image was detected */
return;
}
/* free current texture image, if any */
if (ctx->Texture.Current2D->Image[level]) {
gl_free_texture_image( ctx->Texture.Current2D->Image[level] );
}
/* make new texture from source image */
if (image) {
teximage = image_to_texture(ctx, image, internalformat, border);
}
else {
teximage = make_null_texture(ctx, internalformat,
width, height, 1, border);
}
/* install new texture image */
ctx->Texture.Current2D->Image[level] = teximage;
ctx->Texture.Current2D->Dirty = GL_TRUE;
ctx->Texture.AnyDirty = GL_TRUE;
ctx->NewState |= NEW_TEXTURING;
/* free the source image */
if (image && image->RefCount==0) {
/* if RefCount>0 then image must be in a display list */
gl_free_image(image);
}
/* tell driver about change */
if (ctx->Driver.TexImage) {
(*ctx->Driver.TexImage)( ctx, GL_TEXTURE_2D,
ctx->Texture.Current2D,
level, internalformat, teximage );
}
}
else if (target==GL_PROXY_TEXTURE_2D) {
/* Proxy texture: check for errors and update proxy state */
if (texture_2d_error_check( ctx, target, level, internalformat,
format, type, width, height, border )) {
if (level>=0 && level<MAX_TEXTURE_LEVELS) {
MEMSET( ctx->Texture.Proxy2D->Image[level], 0,
sizeof(struct gl_texture_image) );
}
}
else {
ctx->Texture.Proxy2D->Image[level]->Format = internalformat;
ctx->Texture.Proxy2D->Image[level]->Border = border;
ctx->Texture.Proxy2D->Image[level]->Width = width;
ctx->Texture.Proxy2D->Image[level]->Height = height;
}
if (image && image->RefCount==0) {
/* if RefCount>0 then image must be in a display list */
gl_free_image(image);
}
}
else {
gl_error( ctx, GL_INVALID_ENUM, "glTexImage2D(target)" );
return;
}
}
void gl_GetTexImage( GLcontext *ctx, GLenum target, GLint level, GLenum format,
GLenum type, GLvoid *pixels )
{
gl_problem(ctx, "glGetTexImage not implemented");
/* TODO */
}
/*
* Unpack the image data given to glTexSubImage[123]D.
* This function is just a wrapper for gl_unpack_image() but it does
* some extra error checking.
*/
struct gl_image *
gl_unpack_texsubimage( GLcontext *ctx, GLint width, GLint height,
GLenum format, GLenum type, const GLvoid *pixels )
{
if (type==GL_BITMAP && format!=GL_COLOR_INDEX) {
return NULL;
}
if (format==GL_STENCIL_INDEX || format==GL_DEPTH_COMPONENT){
return NULL;
}
if (gl_sizeof_type(type)<=0) {
return NULL;
}
return gl_unpack_image( ctx, width, height, format, type, pixels );
}
void gl_TexSubImage1D( GLcontext *ctx,
GLenum target, GLint level, GLint xoffset,
GLsizei width, GLenum format, GLenum type,
struct gl_image *image )
{
struct gl_texture_image *destTex;
if (target!=GL_TEXTURE_1D) {
gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage1D(target)" );
return;
}
if (level<0 || level>=MAX_TEXTURE_LEVELS) {
gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage1D(level)" );
return;
}
destTex = ctx->Texture.Current1D->Image[level];
if (!destTex) {
gl_error( ctx, GL_INVALID_OPERATION, "glTexSubImage1D" );
return;
}
if (xoffset < -((GLint)destTex->Border)) {
gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage1D(xoffset)" );
return;
}
if (xoffset + width > destTex->Width + destTex->Border) {
gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage1D(xoffset+width)" );
return;
}
if (image) {
/* unpacking must have been error-free */
GLint texcomponents = components_in_intformat(destTex->Format);
if (image->Type==GL_UNSIGNED_BYTE && texcomponents==image->Components) {
/* Simple case, just byte copy image data into texture image */
/* row by row. */
GLubyte *dst = destTex->Data + texcomponents * xoffset;
GLubyte *src = (GLubyte *) image->Data;
MEMCPY( dst, src, width * texcomponents );
}
else {
/* General case, convert image pixels into texels, scale, bias, etc */
struct gl_texture_image *subTexImg = image_to_texture(ctx, image,
destTex->IntFormat, destTex->Border);
GLubyte *dst = destTex->Data + texcomponents * xoffset;
GLubyte *src = subTexImg->Data;
MEMCPY( dst, src, width * texcomponents );
gl_free_texture_image(subTexImg);
}
/* if the image's reference count is zero, delete it now */
if (image->RefCount==0) {
gl_free_image(image);
}
ctx->Texture.Current1D->Dirty = GL_TRUE;
ctx->Texture.AnyDirty = GL_TRUE;
/* tell driver about change */
if (ctx->Driver.TexSubImage) {
(*ctx->Driver.TexSubImage)( ctx, GL_TEXTURE_1D,
ctx->Texture.Current1D, level,
xoffset,0,width,1,
ctx->Texture.Current1D->Image[level]->IntFormat,
destTex );
}
else {
if (ctx->Driver.TexImage) {
(*ctx->Driver.TexImage)( ctx, GL_TEXTURE_1D,
ctx->Texture.Current1D,
level, ctx->Texture.Current1D->Image[level]->IntFormat,
destTex );
}
}
}
else {
/* if no image, an error must have occured, do more testing now */
GLint components, size;
if (width<0) {
gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage1D(width)" );
return;
}
if (type==GL_BITMAP && format!=GL_COLOR_INDEX) {
gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage1D(format)" );
return;
}
components = components_in_intformat( format );
if (components<0 || format==GL_STENCIL_INDEX
|| format==GL_DEPTH_COMPONENT){
gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage1D(format)" );
return;
}
size = gl_sizeof_type( type );
if (size<=0) {
gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage1D(type)" );
return;
}
/* if we get here, probably ran out of memory during unpacking */
gl_error( ctx, GL_OUT_OF_MEMORY, "glTexSubImage1D" );
}
}
void gl_TexSubImage2D( GLcontext *ctx,
GLenum target, GLint level,
GLint xoffset, GLint yoffset,
GLsizei width, GLsizei height,
GLenum format, GLenum type,
struct gl_image *image )
{
struct gl_texture_image *destTex;
if (target!=GL_TEXTURE_2D) {
gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage2D(target)" );
return;
}
if (level<0 || level>=MAX_TEXTURE_LEVELS) {
gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage2D(level)" );
return;
}
destTex = ctx->Texture.Current2D->Image[level];
if (!destTex) {
gl_error( ctx, GL_INVALID_OPERATION, "glTexSubImage2D" );
return;
}
if (xoffset < -((GLint)destTex->Border)) {
gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage2D(xoffset)" );
return;
}
if (yoffset < -((GLint)destTex->Border)) {
gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage2D(yoffset)" );
return;
}
if (xoffset + width > destTex->Width + destTex->Border) {
gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage2D(xoffset+width)" );
return;
}
if (yoffset + height > destTex->Height + destTex->Border) {
gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage2D(yoffset+height)" );
return;
}
if (image) {
/* unpacking must have been error-free */
GLint texcomponents = components_in_intformat(destTex->Format);
if (image->Type==GL_UNSIGNED_BYTE && texcomponents==image->Components) {
/* Simple case, just byte copy image data into texture image */
/* row by row. */
GLubyte *dst = destTex->Data
+ (yoffset * destTex->Width + xoffset) * texcomponents;
GLubyte *src = (GLubyte *) image->Data;
GLint j;
for (j=0;j<height;j++) {
MEMCPY( dst, src, width * texcomponents );
dst += destTex->Width * texcomponents * sizeof(GLubyte);
src += width * texcomponents * sizeof(GLubyte);
}
}
else {
/* General case, convert image pixels into texels, scale, bias, etc */
struct gl_texture_image *subTexImg = image_to_texture(ctx, image,
destTex->IntFormat, destTex->Border);
GLubyte *dst = destTex->Data
+ (yoffset * destTex->Width + xoffset) * texcomponents;
GLubyte *src = subTexImg->Data;
GLint j;
for (j=0;j<height;j++) {
MEMCPY( dst, src, width * texcomponents );
dst += destTex->Width * texcomponents * sizeof(GLubyte);
src += width * texcomponents * sizeof(GLubyte);
}
gl_free_texture_image(subTexImg);
}
/* if the image's reference count is zero, delete it now */
if (image->RefCount==0) {
gl_free_image(image);
}
ctx->Texture.Current2D->Dirty = GL_TRUE;
ctx->Texture.AnyDirty = GL_TRUE;
/* tell driver about change */
if (ctx->Driver.TexSubImage) {
(*ctx->Driver.TexSubImage)( ctx, GL_TEXTURE_2D, ctx->Texture.Current2D, level,
xoffset, yoffset, width, height,
ctx->Texture.Current2D->Image[level]->IntFormat,
destTex );
}
else {
if (ctx->Driver.TexImage) {
(*ctx->Driver.TexImage)( ctx, GL_TEXTURE_2D, ctx->Texture.Current2D,
level, ctx->Texture.Current2D->Image[level]->IntFormat,
destTex );
}
}
}
else {
/* if no image, an error must have occured, do more testing now */
GLint components, size;
if (width<0) {
gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage2D(width)" );
return;
}
if (height<0) {
gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage2D(height)" );
return;
}
if (type==GL_BITMAP && format!=GL_COLOR_INDEX) {
gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage1D(format)" );
return;
}
components = gl_components_in_format( format );
if (components<0 || format==GL_STENCIL_INDEX
|| format==GL_DEPTH_COMPONENT){
gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage2D(format)" );
return;
}
size = gl_sizeof_type( type );
if (size<=0) {
gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage2D(type)" );
return;
}
/* if we get here, probably ran out of memory during unpacking */
gl_error( ctx, GL_OUT_OF_MEMORY, "glTexSubImage2D" );
}
}
/*
* Read an RGBA image from the frame buffer.
* Input: ctx - the context
* x, y - lower left corner
* width, height - size of region to read
* format - one of GL_RED, GL_RGB, GL_LUMINANCE, etc.
* Return: gl_image pointer or NULL if out of memory
*/
static struct gl_image *read_color_image( GLcontext *ctx, GLint x, GLint y,
GLsizei width, GLsizei height,
GLint format )
{
struct gl_image *image;
GLubyte *imgptr;
GLint components;
GLint i, j;
components = components_in_intformat( format );
/*
* Allocate image struct and image data buffer
*/
image = (struct gl_image *) malloc( sizeof(struct gl_image) );
if (image) {
image->Width = width;
image->Height = height;
image->Components = components;
image->Format = format;
image->Type = GL_UNSIGNED_BYTE;
image->RefCount = 0;
image->Data = (GLubyte *) malloc( width * height * components );
if (!image->Data) {
free(image);
return NULL;
}
}
else {
return NULL;
}
imgptr = (GLubyte *) image->Data;
/* Select buffer to read from */
(void) (*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.ReadBuffer );
for (j=0;j<height;j++) {
GLubyte red[MAX_WIDTH], green[MAX_WIDTH];
GLubyte blue[MAX_WIDTH], alpha[MAX_WIDTH];
gl_read_color_span( ctx, width, x, y+j, red, green, blue, alpha );
if (!ctx->Visual->EightBitColor) {
/* scale red, green, blue, alpha values to range [0,255] */
GLfloat rscale = 255.0f * ctx->Visual->InvRedScale;
GLfloat gscale = 255.0f * ctx->Visual->InvGreenScale;
GLfloat bscale = 255.0f * ctx->Visual->InvBlueScale;
GLfloat ascale = 255.0f * ctx->Visual->InvAlphaScale;
for (i=0;i<width;i++) {
red[i] = (GLubyte) (GLint) (red[i] * rscale);
green[i] = (GLubyte) (GLint) (green[i] * gscale);
blue[i] = (GLubyte) (GLint) (blue[i] * bscale);
alpha[i] = (GLubyte) (GLint) (alpha[i] * ascale);
}
}
switch (format) {
case GL_ALPHA:
for (i=0;i<width;i++) {
*imgptr++ = alpha[i];
}
break;
case GL_LUMINANCE:
for (i=0;i<width;i++) {
*imgptr++ = red[i];
}
break;
case GL_LUMINANCE_ALPHA:
for (i=0;i<width;i++) {
*imgptr++ = red[i];
*imgptr++ = alpha[i];
}
break;
case GL_INTENSITY:
for (i=0;i<width;i++) {
*imgptr++ = red[i];
}
break;
case GL_RGB:
for (i=0;i<width;i++) {
*imgptr++ = red[i];
*imgptr++ = green[i];
*imgptr++ = blue[i];
}
break;
case GL_RGBA:
for (i=0;i<width;i++) {
*imgptr++ = red[i];
*imgptr++ = green[i];
*imgptr++ = blue[i];
*imgptr++ = alpha[i];
}
break;
} /*switch*/
} /*for*/
/* Restore drawing buffer */
(void) (*ctx->Driver.SetBuffer)( ctx, ctx->Color.DrawBuffer );
return image;
}
void gl_CopyTexImage1D( GLcontext *ctx,
GLenum target, GLint level,
GLenum internalformat,
GLint x, GLint y,
GLsizei width, GLint border )
{
GLint format;
struct gl_image *teximage;
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glCopyTexImage1D" );
return;
}
if (target!=GL_TEXTURE_1D) {
gl_error( ctx, GL_INVALID_ENUM, "glCopyTexImage1D(target)" );
return;
}
if (level<0 || level>=MAX_TEXTURE_LEVELS) {
gl_error( ctx, GL_INVALID_VALUE, "glCopyTexImage1D(level)" );
return;
}
if (border!=0 && border!=1) {
gl_error( ctx, GL_INVALID_VALUE, "glCopyTexImage1D(border)" );
return;
}
if (width<2*border || width>2+MAX_TEXTURE_SIZE || width<0) {
gl_error( ctx, GL_INVALID_VALUE, "glCopyTexImage1D(width)" );
return;
}
format = decode_internal_format( internalformat );
if (format<0 || (internalformat>=1 && internalformat<=4)) {
gl_error( ctx, GL_INVALID_VALUE, "glCopyTexImage1D(format)" );
return;
}
teximage = read_color_image( ctx, x, y, width, 1, format );
if (!teximage) {
gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyTexImage1D" );
return;
}
gl_TexImage1D( ctx, target, level, internalformat, width,
border, GL_RGBA, GL_UNSIGNED_BYTE, teximage );
/* teximage was freed in gl_TexImage1D */
}
void gl_CopyTexImage2D( GLcontext *ctx,
GLenum target, GLint level, GLenum internalformat,
GLint x, GLint y, GLsizei width, GLsizei height,
GLint border )
{
GLint format;
struct gl_image *teximage;
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glCopyTexImage2D" );
return;
}
if (target!=GL_TEXTURE_2D) {
gl_error( ctx, GL_INVALID_ENUM, "glCopyTexImage2D(target)" );
return;
}
if (level<0 || level>=MAX_TEXTURE_LEVELS) {
gl_error( ctx, GL_INVALID_VALUE, "glCopyTexImage2D(level)" );
return;
}
if (border!=0 && border!=1) {
gl_error( ctx, GL_INVALID_VALUE, "glCopyTexImage2D(border)" );
return;
}
if (width<2*border || width>2+MAX_TEXTURE_SIZE || width<0) {
gl_error( ctx, GL_INVALID_VALUE, "glCopyTexImage2D(width)" );
return;
}
if (height<2*border || height>2+MAX_TEXTURE_SIZE || height<0) {
gl_error( ctx, GL_INVALID_VALUE, "glCopyTexImage2D(height)" );
return;
}
format = decode_internal_format( internalformat );
if (format<0 || (internalformat>=1 && internalformat<=4)) {
gl_error( ctx, GL_INVALID_VALUE, "glCopyTexImage2D(format)" );
return;
}
teximage = read_color_image( ctx, x, y, width, height, format );
if (!teximage) {
gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyTexImage2D" );
return;
}
gl_TexImage2D( ctx, target, level, internalformat, width, height,
border, GL_RGBA, GL_UNSIGNED_BYTE, teximage );
/* teximage was freed in gl_TexImage2D */
}
/*
* Do the work of glCopyTexSubImage[12]D.
* TODO: apply pixel bias scale and mapping.
*/
static void copy_tex_sub_image( GLcontext *ctx, struct gl_texture_image *dest,
GLint width, GLint height,
GLint srcx, GLint srcy,
GLint dstx, GLint dsty)
{
GLint i, j;
GLint format, components;
format = dest->Format;
components = components_in_intformat( format );
for (j=0;j<height;j++) {
GLubyte red[MAX_WIDTH], green[MAX_WIDTH];
GLubyte blue[MAX_WIDTH], alpha[MAX_WIDTH];
GLubyte *texptr;
gl_read_color_span( ctx, width, srcx, srcy+j, red, green, blue, alpha );
if (!ctx->Visual->EightBitColor) {
/* scale red, green, blue, alpha values to range [0,255] */
GLfloat rscale = 255.0f * ctx->Visual->InvRedScale;
GLfloat gscale = 255.0f * ctx->Visual->InvGreenScale;
GLfloat bscale = 255.0f * ctx->Visual->InvBlueScale;
GLfloat ascale = 255.0f * ctx->Visual->InvAlphaScale;
for (i=0;i<width;i++) {
red[i] = (GLubyte) (GLint) (red[i] * rscale);
green[i] = (GLubyte) (GLint) (green[i] * gscale);
blue[i] = (GLubyte) (GLint) (blue[i] * bscale);
alpha[i] = (GLubyte) (GLint) (alpha[i] * ascale);
}
}
texptr = dest->Data + ( (dsty+j) * width + dstx) * components;
switch (format) {
case GL_ALPHA:
for (i=0;i<width;i++) {
*texptr++ = alpha[i];
}
break;
case GL_LUMINANCE:
for (i=0;i<width;i++) {
*texptr++ = red[i];
}
break;
case GL_LUMINANCE_ALPHA:
for (i=0;i<width;i++) {
*texptr++ = red[i];
*texptr++ = alpha[i];
}
break;
case GL_INTENSITY:
for (i=0;i<width;i++) {
*texptr++ = red[i];
}
break;
case GL_RGB:
for (i=0;i<width;i++) {
*texptr++ = red[i];
*texptr++ = green[i];
*texptr++ = blue[i];
}
break;
case GL_RGBA:
for (i=0;i<width;i++) {
*texptr++ = red[i];
*texptr++ = green[i];
*texptr++ = blue[i];
*texptr++ = alpha[i];
}
break;
} /*switch*/
} /*for*/
}
void gl_CopyTexSubImage1D( GLcontext *ctx,
GLenum target, GLint level,
GLint xoffset, GLint x, GLint y, GLsizei width )
{
struct gl_texture_image *teximage;
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glCopyTexSubImage1D" );
return;
}
if (target!=GL_TEXTURE_1D) {
gl_error( ctx, GL_INVALID_ENUM, "glCopyTexSubImage1D(target)" );
return;
}
if (level<0 || level>=MAX_TEXTURE_LEVELS) {
gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage1D(level)" );
return;
}
if (width<0) {
gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage1D(width)" );
return;
}
teximage = ctx->Texture.Current1D->Image[level];
if (teximage) {
if (xoffset < -((GLint)teximage->Border)) {
gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage1D(xoffset)" );
return;
}
/* NOTE: we're adding the border here, not subtracting! */
if (xoffset+width > teximage->Width+teximage->Border) {
gl_error( ctx, GL_INVALID_VALUE,
"glCopyTexSubImage1D(xoffset+width)" );
return;
}
if (teximage->Data) {
copy_tex_sub_image( ctx, teximage, width, 1, x, y, xoffset, 0);
}
}
else {
gl_error( ctx, GL_INVALID_OPERATION, "glCopyTexSubImage1D" );
}
}
void gl_CopyTexSubImage2D( GLcontext *ctx,
GLenum target, GLint level,
GLint xoffset, GLint yoffset,
GLint x, GLint y, GLsizei width, GLsizei height )
{
struct gl_texture_image *teximage;
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glCopyTexSubImage2D" );
return;
}
if (target!=GL_TEXTURE_2D) {
gl_error( ctx, GL_INVALID_ENUM, "glCopyTexSubImage2D(target)" );
return;
}
if (level<0 || level>=MAX_TEXTURE_LEVELS) {
gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage2D(level)" );
return;
}
if (width<0) {
gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage2D(width)" );
return;
}
if (height<0) {
gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage2D(height)" );
return;
}
teximage = ctx->Texture.Current2D->Image[level];
if (teximage) {
if (xoffset < -((GLint)teximage->Border)) {
gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage2D(xoffset)" );
return;
}
if (yoffset < -((GLint)teximage->Border)) {
gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage2D(yoffset)" );
return;
}
/* NOTE: we're adding the border here, not subtracting! */
if (xoffset+width > teximage->Width+teximage->Border) {
gl_error( ctx, GL_INVALID_VALUE,
"glCopyTexSubImage2D(xoffset+width)" );
return;
}
if (yoffset+height > teximage->Height+teximage->Border) {
gl_error( ctx, GL_INVALID_VALUE,
"glCopyTexSubImage2D(yoffset+height)" );
return;
}
if (teximage->Data) {
copy_tex_sub_image( ctx, teximage, width, height,
x, y, xoffset, yoffset);
}
}
else {
gl_error( ctx, GL_INVALID_OPERATION, "glCopyTexSubImage2D" );
}
}
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