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- /* $Id: pixel.c,v 1.6 1997/02/09 20:05:03 brianp Exp $ */
-
- /*
- * Mesa 3-D graphics library
- * Version: 2.2
- * 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: pixel.c,v $
- * Revision 1.6 1997/02/09 20:05:03 brianp
- * new arguments for gl_pixel_addr_in_image()
- *
- * Revision 1.5 1997/02/09 18:52:37 brianp
- * added GL_EXT_texture3D support
- *
- * Revision 1.4 1996/11/06 04:09:37 brianp
- * added a missing return after a gl_error() call
- *
- * Revision 1.3 1996/09/26 22:35:10 brianp
- * fixed a few compiler warnings from IRIX 6 -n32 and -64 compiler
- *
- * Revision 1.2 1996/09/15 14:18:55 brianp
- * now use GLframebuffer and GLvisual
- *
- * Revision 1.1 1996/09/13 01:38:16 brianp
- * Initial revision
- *
- */
-
-
- /*
- * glPixelStore, glPixelTransfer, glPixelMap, glPixelZoom, etc.
- */
-
-
-
- #include <assert.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include "context.h"
- #include "dlist.h"
- #include "macros.h"
- #include "pixel.h"
- #include "image.h"
- #include "span.h"
- #include "stencil.h"
- #include "types.h"
-
-
-
- /*
- * Determine if we can use the optimized glDrawPixels function.
- */
- static void update_drawpixels_state( GLcontext *ctx )
- {
- if (ctx->Visual->RGBAflag==GL_TRUE &&
- ctx->Visual->EightBitColor &&
- ctx->Pixel.RedBias==0.0 && ctx->Pixel.RedScale==1.0 &&
- ctx->Pixel.GreenBias==0.0 && ctx->Pixel.GreenScale==1.0 &&
- ctx->Pixel.BlueBias==0.0 && ctx->Pixel.BlueScale==1.0 &&
- ctx->Pixel.AlphaBias==0.0 && ctx->Pixel.AlphaScale==1.0 &&
- ctx->Pixel.MapColorFlag==GL_FALSE &&
- ctx->Pixel.ZoomX==1.0 && ctx->Pixel.ZoomY==1.0 &&
- /* ctx->Unpack.Alignment==4 &&*/
- ctx->Unpack.RowLength==0 &&
- ctx->Unpack.SkipPixels==0 &&
- ctx->Unpack.SkipRows==0 &&
- ctx->Unpack.SwapBytes==0 &&
- ctx->Unpack.LsbFirst==0) {
- ctx->FastDrawPixels = GL_TRUE;
- }
- else {
- ctx->FastDrawPixels = GL_FALSE;
- }
- }
-
-
-
-
- /**********************************************************************/
- /***** glPixelZoom *****/
- /**********************************************************************/
-
-
-
- void gl_PixelZoom( GLcontext *ctx, GLfloat xfactor, GLfloat yfactor )
- {
- if (INSIDE_BEGIN_END(ctx)) {
- gl_error( ctx, GL_INVALID_OPERATION, "glPixelZoom" );
- return;
- }
- ctx->Pixel.ZoomX = xfactor;
- ctx->Pixel.ZoomY = yfactor;
- update_drawpixels_state( ctx );
- }
-
-
-
-
- /*
- * Write a span of pixels to the frame buffer while applying a pixel zoom.
- * This is only used by glDrawPixels and glCopyPixels.
- * Input: n - number of pixels in input row
- * x, y - destination of the span
- * z - depth values for the span
- * red, green, blue, alpha - array of colors
- * y0 - location of first row in the image we're drawing.
- */
- void
- gl_write_zoomed_color_span( GLcontext *ctx,
- GLuint n, GLint x, GLint y, const GLdepth z[],
- const GLubyte red[], const GLubyte green[],
- const GLubyte blue[], const GLubyte alpha[],
- GLint y0 )
- {
- GLint m;
- GLint r0, r1, row, r;
- GLint i, j, skipcol;
- GLubyte zred[MAX_WIDTH], zgreen[MAX_WIDTH]; /* zoomed pixel colors */
- GLubyte zblue[MAX_WIDTH], zalpha[MAX_WIDTH];
- GLdepth zdepth[MAX_WIDTH]; /* zoomed depth values */
- GLint maxwidth = MIN2( ctx->Buffer->Width, MAX_WIDTH );
-
- /* compute width of output row */
- m = (GLint) ABSF( n * ctx->Pixel.ZoomX );
- if (m==0) {
- return;
- }
- if (ctx->Pixel.ZoomX<0.0) {
- /* adjust x coordinate for left/right mirroring */
- x = x - m;
- }
-
- /* compute which rows to draw */
- row = y-y0;
- r0 = y0 + (GLint) (row * ctx->Pixel.ZoomY);
- r1 = y0 + (GLint) ((row+1) * ctx->Pixel.ZoomY);
- if (r0==r1) {
- return;
- }
- else if (r1<r0) {
- GLint rtmp = r1;
- r1 = r0;
- r0 = rtmp;
- }
-
- /* return early if r0...r1 is above or below window */
- if (r0<0 && r1<0) {
- /* below window */
- return;
- }
- if (r0>=ctx->Buffer->Height && r1>=ctx->Buffer->Height) {
- /* above window */
- return;
- }
-
- /* check if left edge is outside window */
- skipcol = 0;
- if (x<0) {
- skipcol = -x;
- m += x;
- }
- /* make sure span isn't too long or short */
- if (m>maxwidth) {
- m = maxwidth;
- }
- else if (m<=0) {
- return;
- }
-
- assert( m <= MAX_WIDTH );
-
- /* zoom the span horizontally */
- if (ctx->Pixel.ZoomX==-1.0F) {
- /* n==m */
- for (j=0;j<m;j++) {
- i = n - (j+skipcol) - 1;
- zred[j] = red[i];
- zgreen[j] = green[i];
- zblue[j] = blue[i];
- zalpha[j] = alpha[i];
- zdepth[j] = z[i];
- }
- }
- else {
- GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
- for (j=0;j<m;j++) {
- i = (j+skipcol) * xscale;
- if (i<0) i = n + i - 1;
- zred[j] = red[i];
- zgreen[j] = green[i];
- zblue[j] = blue[i];
- zalpha[j] = alpha[i];
- zdepth[j] = z[i];
- }
- }
-
- /* write the span */
- for (r=r0; r<r1; r++) {
- gl_write_color_span( ctx, m, x+skipcol, r, zdepth,
- zred, zgreen, zblue, zalpha, GL_BITMAP );
- }
- }
-
-
-
- /*
- * As above, but write CI pixels.
- */
- void
- gl_write_zoomed_index_span( GLcontext *ctx,
- GLuint n, GLint x, GLint y, const GLdepth z[],
- const GLuint indexes[], GLint y0 )
- {
- GLint m;
- GLint r0, r1, row, r;
- GLint i, j, skipcol;
- GLuint zindexes[MAX_WIDTH]; /* zoomed color indexes */
- GLdepth zdepth[MAX_WIDTH]; /* zoomed depth values */
- GLint maxwidth = MIN2( ctx->Buffer->Width, MAX_WIDTH );
-
- /* compute width of output row */
- m = (GLint) ABSF( n * ctx->Pixel.ZoomX );
- if (m==0) {
- return;
- }
- if (ctx->Pixel.ZoomX<0.0) {
- /* adjust x coordinate for left/right mirroring */
- x = x - m;
- }
-
- /* compute which rows to draw */
- row = y-y0;
- r0 = y0 + (GLint) (row * ctx->Pixel.ZoomY);
- r1 = y0 + (GLint) ((row+1) * ctx->Pixel.ZoomY);
- if (r0==r1) {
- return;
- }
- else if (r1<r0) {
- GLint rtmp = r1;
- r1 = r0;
- r0 = rtmp;
- }
-
- /* return early if r0...r1 is above or below window */
- if (r0<0 && r1<0) {
- /* below window */
- return;
- }
- if (r0>=ctx->Buffer->Height && r1>=ctx->Buffer->Height) {
- /* above window */
- return;
- }
-
- /* check if left edge is outside window */
- skipcol = 0;
- if (x<0) {
- skipcol = -x;
- m += x;
- }
- /* make sure span isn't too long or short */
- if (m>maxwidth) {
- m = maxwidth;
- }
- else if (m<=0) {
- return;
- }
-
- assert( m <= MAX_WIDTH );
-
- /* zoom the span horizontally */
- if (ctx->Pixel.ZoomX==-1.0F) {
- /* n==m */
- for (j=0;j<m;j++) {
- i = n - (j+skipcol) - 1;
- zindexes[j] = indexes[i];
- zdepth[j] = z[i];
- }
- }
- else {
- GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
- for (j=0;j<m;j++) {
- i = (j+skipcol) * xscale;
- if (i<0) i = n + i - 1;
- zindexes[j] = indexes[i];
- zdepth[j] = z[i];
- }
- }
-
- /* write the span */
- for (r=r0; r<r1; r++) {
- gl_write_index_span( ctx, m, x+skipcol, r, zdepth, zindexes, GL_BITMAP );
- }
- }
-
-
-
- /*
- * As above, but write stencil values.
- */
- void
- gl_write_zoomed_stencil_span( GLcontext *ctx,
- GLuint n, GLint x, GLint y,
- const GLubyte stencil[], GLint y0 )
- {
- GLint m;
- GLint r0, r1, row, r;
- GLint i, j, skipcol;
- GLubyte zstencil[MAX_WIDTH]; /* zoomed stencil values */
- GLint maxwidth = MIN2( ctx->Buffer->Width, MAX_WIDTH );
-
- /* compute width of output row */
- m = (GLint) ABSF( n * ctx->Pixel.ZoomX );
- if (m==0) {
- return;
- }
- if (ctx->Pixel.ZoomX<0.0) {
- /* adjust x coordinate for left/right mirroring */
- x = x - m;
- }
-
- /* compute which rows to draw */
- row = y-y0;
- r0 = y0 + (GLint) (row * ctx->Pixel.ZoomY);
- r1 = y0 + (GLint) ((row+1) * ctx->Pixel.ZoomY);
- if (r0==r1) {
- return;
- }
- else if (r1<r0) {
- GLint rtmp = r1;
- r1 = r0;
- r0 = rtmp;
- }
-
- /* return early if r0...r1 is above or below window */
- if (r0<0 && r1<0) {
- /* below window */
- return;
- }
- if (r0>=ctx->Buffer->Height && r1>=ctx->Buffer->Height) {
- /* above window */
- return;
- }
-
- /* check if left edge is outside window */
- skipcol = 0;
- if (x<0) {
- skipcol = -x;
- m += x;
- }
- /* make sure span isn't too long or short */
- if (m>maxwidth) {
- m = maxwidth;
- }
- else if (m<=0) {
- return;
- }
-
- assert( m <= MAX_WIDTH );
-
- /* zoom the span horizontally */
- if (ctx->Pixel.ZoomX==-1.0F) {
- /* n==m */
- for (j=0;j<m;j++) {
- i = n - (j+skipcol) - 1;
- zstencil[j] = stencil[i];
- }
- }
- else {
- GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
- for (j=0;j<m;j++) {
- i = (j+skipcol) * xscale;
- if (i<0) i = n + i - 1;
- zstencil[j] = stencil[i];
- }
- }
-
- /* write the span */
- for (r=r0; r<r1; r++) {
- gl_write_stencil_span( ctx, m, x+skipcol, r, zstencil );
- }
- }
-
-
-
-
- /**********************************************************************/
- /***** glPixelStore *****/
- /**********************************************************************/
-
-
- void gl_PixelStorei( GLcontext *ctx, GLenum pname, GLint param )
- {
- /* NOTE: this call can't be compiled into the display list */
-
- if (INSIDE_BEGIN_END(ctx)) {
- gl_error( ctx, GL_INVALID_OPERATION, "glPixelStore" );
- return;
- }
-
- switch (pname) {
- case GL_PACK_SWAP_BYTES:
- ctx->Pack.SwapBytes = param ? GL_TRUE : GL_FALSE;
- break;
- case GL_PACK_LSB_FIRST:
- ctx->Pack.LsbFirst = param ? GL_TRUE : GL_FALSE;
- break;
- case GL_PACK_ROW_LENGTH:
- if (param<0) {
- gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
- }
- else {
- ctx->Pack.RowLength = param;
- }
- break;
- case GL_PACK_SKIP_PIXELS:
- if (param<0) {
- gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
- }
- else {
- ctx->Pack.SkipPixels = param;
- }
- break;
- case GL_PACK_SKIP_ROWS:
- if (param<0) {
- gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
- }
- else {
- ctx->Pack.SkipRows = param;
- }
- break;
- case GL_PACK_ALIGNMENT:
- if (param==1 || param==2 || param==4 || param==8) {
- ctx->Pack.Alignment = param;
- }
- else {
- gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
- }
- break;
- case GL_UNPACK_SWAP_BYTES:
- ctx->Unpack.SwapBytes = param ? GL_TRUE : GL_FALSE;
- break;
- case GL_UNPACK_LSB_FIRST:
- ctx->Unpack.LsbFirst = param ? GL_TRUE : GL_FALSE;
- break;
- case GL_UNPACK_ROW_LENGTH:
- if (param<0) {
- gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
- }
- else {
- ctx->Unpack.RowLength = param;
- }
- break;
- case GL_UNPACK_SKIP_PIXELS:
- if (param<0) {
- gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
- }
- else {
- ctx->Unpack.SkipPixels = param;
- }
- break;
- case GL_UNPACK_SKIP_ROWS:
- if (param<0) {
- gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
- }
- else {
- ctx->Unpack.SkipRows = param;
- }
- break;
- case GL_UNPACK_ALIGNMENT:
- if (param==1 || param==2 || param==4 || param==8) {
- ctx->Unpack.Alignment = param;
- }
- else {
- gl_error( ctx, GL_INVALID_VALUE, "glPixelStore" );
- }
- break;
- default:
- gl_error( ctx, GL_INVALID_ENUM, "glPixelStore" );
- }
- update_drawpixels_state( ctx );
- }
-
-
-
-
-
- /**********************************************************************/
- /***** glPixelMap *****/
- /**********************************************************************/
-
-
-
- void gl_PixelMapfv( GLcontext *ctx,
- GLenum map, GLint mapsize, const GLfloat *values )
- {
- GLuint i;
-
- if (INSIDE_BEGIN_END(ctx)) {
- gl_error( ctx, GL_INVALID_OPERATION, "glPixelMapfv" );
- return;
- }
-
- if (mapsize<0 || mapsize>MAX_PIXEL_MAP_TABLE) {
- gl_error( ctx, GL_INVALID_VALUE, "glPixelMapfv(mapsize)" );
- return;
- }
-
- if (map>=GL_PIXEL_MAP_S_TO_S && map<=GL_PIXEL_MAP_I_TO_A) {
- /* test that mapsize is a power of two */
- GLuint p;
- GLboolean ok = GL_FALSE;
- for (p=1; p<=MAX_PIXEL_MAP_TABLE; p=p<<1) {
- if ( (p&mapsize) == p ) {
- ok = GL_TRUE;
- break;
- }
- }
- if (!ok) {
- gl_error( ctx, GL_INVALID_VALUE, "glPixelMapfv(mapsize)" );
- return;
- }
- }
-
- switch (map) {
- case GL_PIXEL_MAP_S_TO_S:
- ctx->Pixel.MapStoSsize = mapsize;
- for (i=0;i<mapsize;i++) {
- ctx->Pixel.MapStoS[i] = (GLint) values[i];
- }
- break;
- case GL_PIXEL_MAP_I_TO_I:
- ctx->Pixel.MapItoIsize = mapsize;
- for (i=0;i<mapsize;i++) {
- ctx->Pixel.MapItoI[i] = (GLint) values[i];
- }
- break;
- case GL_PIXEL_MAP_I_TO_R:
- ctx->Pixel.MapItoRsize = mapsize;
- for (i=0;i<mapsize;i++) {
- ctx->Pixel.MapItoR[i] = CLAMP( values[i], 0.0, 1.0 );
- }
- break;
- case GL_PIXEL_MAP_I_TO_G:
- ctx->Pixel.MapItoGsize = mapsize;
- for (i=0;i<mapsize;i++) {
- ctx->Pixel.MapItoG[i] = CLAMP( values[i], 0.0, 1.0 );
- }
- break;
- case GL_PIXEL_MAP_I_TO_B:
- ctx->Pixel.MapItoBsize = mapsize;
- for (i=0;i<mapsize;i++) {
- ctx->Pixel.MapItoB[i] = CLAMP( values[i], 0.0, 1.0 );
- }
- break;
- case GL_PIXEL_MAP_I_TO_A:
- ctx->Pixel.MapItoAsize = mapsize;
- for (i=0;i<mapsize;i++) {
- ctx->Pixel.MapItoA[i] = CLAMP( values[i], 0.0, 1.0 );
- }
- break;
- case GL_PIXEL_MAP_R_TO_R:
- ctx->Pixel.MapRtoRsize = mapsize;
- for (i=0;i<mapsize;i++) {
- ctx->Pixel.MapRtoR[i] = CLAMP( values[i], 0.0, 1.0 );
- }
- break;
- case GL_PIXEL_MAP_G_TO_G:
- ctx->Pixel.MapGtoGsize = mapsize;
- for (i=0;i<mapsize;i++) {
- ctx->Pixel.MapGtoG[i] = CLAMP( values[i], 0.0, 1.0 );
- }
- break;
- case GL_PIXEL_MAP_B_TO_B:
- ctx->Pixel.MapBtoBsize = mapsize;
- for (i=0;i<mapsize;i++) {
- ctx->Pixel.MapBtoB[i] = CLAMP( values[i], 0.0, 1.0 );
- }
- break;
- case GL_PIXEL_MAP_A_TO_A:
- ctx->Pixel.MapAtoAsize = mapsize;
- for (i=0;i<mapsize;i++) {
- ctx->Pixel.MapAtoA[i] = CLAMP( values[i], 0.0, 1.0 );
- }
- break;
- default:
- gl_error( ctx, GL_INVALID_ENUM, "glPixelMapfv(map)" );
- }
- }
-
-
-
-
-
- void gl_GetPixelMapfv( GLcontext *ctx, GLenum map, GLfloat *values )
- {
- GLuint i;
-
- if (INSIDE_BEGIN_END(ctx)) {
- gl_error( ctx, GL_INVALID_OPERATION, "glGetPixelMapfv" );
- return;
- }
- switch (map) {
- case GL_PIXEL_MAP_I_TO_I:
- for (i=0;i<ctx->Pixel.MapItoIsize;i++) {
- values[i] = (GLfloat) ctx->Pixel.MapItoI[i];
- }
- break;
- case GL_PIXEL_MAP_S_TO_S:
- for (i=0;i<ctx->Pixel.MapStoSsize;i++) {
- values[i] = (GLfloat) ctx->Pixel.MapStoS[i];
- }
- break;
- case GL_PIXEL_MAP_I_TO_R:
- MEMCPY(values,ctx->Pixel.MapItoR,ctx->Pixel.MapItoRsize*sizeof(GLfloat));
- break;
- case GL_PIXEL_MAP_I_TO_G:
- MEMCPY(values,ctx->Pixel.MapItoG,ctx->Pixel.MapItoGsize*sizeof(GLfloat));
- break;
- case GL_PIXEL_MAP_I_TO_B:
- MEMCPY(values,ctx->Pixel.MapItoB,ctx->Pixel.MapItoBsize*sizeof(GLfloat));
- break;
- case GL_PIXEL_MAP_I_TO_A:
- MEMCPY(values,ctx->Pixel.MapItoA,ctx->Pixel.MapItoAsize*sizeof(GLfloat));
- break;
- case GL_PIXEL_MAP_R_TO_R:
- MEMCPY(values,ctx->Pixel.MapRtoR,ctx->Pixel.MapRtoRsize*sizeof(GLfloat));
- break;
- case GL_PIXEL_MAP_G_TO_G:
- MEMCPY(values,ctx->Pixel.MapGtoG,ctx->Pixel.MapGtoGsize*sizeof(GLfloat));
- break;
- case GL_PIXEL_MAP_B_TO_B:
- MEMCPY(values,ctx->Pixel.MapBtoB,ctx->Pixel.MapBtoBsize*sizeof(GLfloat));
- break;
- case GL_PIXEL_MAP_A_TO_A:
- MEMCPY(values,ctx->Pixel.MapAtoA,ctx->Pixel.MapAtoAsize*sizeof(GLfloat));
- break;
- default:
- gl_error( ctx, GL_INVALID_ENUM, "glGetPixelMapfv" );
- }
- }
-
-
- void gl_GetPixelMapuiv( GLcontext *ctx, GLenum map, GLuint *values )
- {
- GLuint i;
-
- if (INSIDE_BEGIN_END(ctx)) {
- gl_error( ctx, GL_INVALID_OPERATION, "glGetPixelMapfv" );
- return;
- }
- switch (map) {
- case GL_PIXEL_MAP_I_TO_I:
- MEMCPY(values, ctx->Pixel.MapItoI, ctx->Pixel.MapItoIsize*sizeof(GLint));
- break;
- case GL_PIXEL_MAP_S_TO_S:
- MEMCPY(values, ctx->Pixel.MapStoS, ctx->Pixel.MapStoSsize*sizeof(GLint));
- break;
- case GL_PIXEL_MAP_I_TO_R:
- for (i=0;i<ctx->Pixel.MapItoRsize;i++) {
- values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoR[i] );
- }
- break;
- case GL_PIXEL_MAP_I_TO_G:
- for (i=0;i<ctx->Pixel.MapItoGsize;i++) {
- values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoG[i] );
- }
- break;
- case GL_PIXEL_MAP_I_TO_B:
- for (i=0;i<ctx->Pixel.MapItoBsize;i++) {
- values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoB[i] );
- }
- break;
- case GL_PIXEL_MAP_I_TO_A:
- for (i=0;i<ctx->Pixel.MapItoAsize;i++) {
- values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoA[i] );
- }
- break;
- case GL_PIXEL_MAP_R_TO_R:
- for (i=0;i<ctx->Pixel.MapRtoRsize;i++) {
- values[i] = FLOAT_TO_UINT( ctx->Pixel.MapRtoR[i] );
- }
- break;
- case GL_PIXEL_MAP_G_TO_G:
- for (i=0;i<ctx->Pixel.MapGtoGsize;i++) {
- values[i] = FLOAT_TO_UINT( ctx->Pixel.MapGtoG[i] );
- }
- break;
- case GL_PIXEL_MAP_B_TO_B:
- for (i=0;i<ctx->Pixel.MapBtoBsize;i++) {
- values[i] = FLOAT_TO_UINT( ctx->Pixel.MapBtoB[i] );
- }
- break;
- case GL_PIXEL_MAP_A_TO_A:
- for (i=0;i<ctx->Pixel.MapAtoAsize;i++) {
- values[i] = FLOAT_TO_UINT( ctx->Pixel.MapAtoA[i] );
- }
- break;
- default:
- gl_error( ctx, GL_INVALID_ENUM, "glGetPixelMapfv" );
- }
- }
-
-
- void gl_GetPixelMapusv( GLcontext *ctx, GLenum map, GLushort *values )
- {
- GLuint i;
-
- if (INSIDE_BEGIN_END(ctx)) {
- gl_error( ctx, GL_INVALID_OPERATION, "glGetPixelMapfv" );
- return;
- }
- switch (map) {
- case GL_PIXEL_MAP_I_TO_I:
- for (i=0;i<ctx->Pixel.MapItoIsize;i++) {
- values[i] = (GLushort) ctx->Pixel.MapItoI[i];
- }
- break;
- case GL_PIXEL_MAP_S_TO_S:
- for (i=0;i<ctx->Pixel.MapStoSsize;i++) {
- values[i] = (GLushort) ctx->Pixel.MapStoS[i];
- }
- break;
- case GL_PIXEL_MAP_I_TO_R:
- for (i=0;i<ctx->Pixel.MapItoRsize;i++) {
- values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoR[i] );
- }
- break;
- case GL_PIXEL_MAP_I_TO_G:
- for (i=0;i<ctx->Pixel.MapItoGsize;i++) {
- values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoG[i] );
- }
- break;
- case GL_PIXEL_MAP_I_TO_B:
- for (i=0;i<ctx->Pixel.MapItoBsize;i++) {
- values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoB[i] );
- }
- break;
- case GL_PIXEL_MAP_I_TO_A:
- for (i=0;i<ctx->Pixel.MapItoAsize;i++) {
- values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoA[i] );
- }
- break;
- case GL_PIXEL_MAP_R_TO_R:
- for (i=0;i<ctx->Pixel.MapRtoRsize;i++) {
- values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapRtoR[i] );
- }
- break;
- case GL_PIXEL_MAP_G_TO_G:
- for (i=0;i<ctx->Pixel.MapGtoGsize;i++) {
- values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapGtoG[i] );
- }
- break;
- case GL_PIXEL_MAP_B_TO_B:
- for (i=0;i<ctx->Pixel.MapBtoBsize;i++) {
- values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapBtoB[i] );
- }
- break;
- case GL_PIXEL_MAP_A_TO_A:
- for (i=0;i<ctx->Pixel.MapAtoAsize;i++) {
- values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapAtoA[i] );
- }
- break;
- default:
- gl_error( ctx, GL_INVALID_ENUM, "glGetPixelMapfv" );
- }
- }
-
-
-
- /**********************************************************************/
- /***** glPixelTransfer *****/
- /**********************************************************************/
-
-
- /*
- * Implements glPixelTransfer[fi] whether called immediately or from a
- * display list.
- */
- void gl_PixelTransferf( GLcontext *ctx, GLenum pname, GLfloat param )
- {
- if (INSIDE_BEGIN_END(ctx)) {
- gl_error( ctx, GL_INVALID_OPERATION, "glPixelTransfer" );
- return;
- }
-
- switch (pname) {
- case GL_MAP_COLOR:
- ctx->Pixel.MapColorFlag = param ? GL_TRUE : GL_FALSE;
- break;
- case GL_MAP_STENCIL:
- ctx->Pixel.MapStencilFlag = param ? GL_TRUE : GL_FALSE;
- break;
- case GL_INDEX_SHIFT:
- ctx->Pixel.IndexShift = (GLint) param;
- break;
- case GL_INDEX_OFFSET:
- ctx->Pixel.IndexOffset = (GLint) param;
- break;
- case GL_RED_SCALE:
- ctx->Pixel.RedScale = param;
- break;
- case GL_RED_BIAS:
- ctx->Pixel.RedBias = param;
- break;
- case GL_GREEN_SCALE:
- ctx->Pixel.GreenScale = param;
- break;
- case GL_GREEN_BIAS:
- ctx->Pixel.GreenBias = param;
- break;
- case GL_BLUE_SCALE:
- ctx->Pixel.BlueScale = param;
- break;
- case GL_BLUE_BIAS:
- ctx->Pixel.BlueBias = param;
- break;
- case GL_ALPHA_SCALE:
- ctx->Pixel.AlphaScale = param;
- break;
- case GL_ALPHA_BIAS:
- ctx->Pixel.AlphaBias = param;
- break;
- case GL_DEPTH_SCALE:
- ctx->Pixel.DepthScale = param;
- break;
- case GL_DEPTH_BIAS:
- ctx->Pixel.DepthBias = param;
- break;
- default:
- gl_error( ctx, GL_INVALID_ENUM, "glPixelTransfer(pname)" );
- return;
- }
- update_drawpixels_state( ctx );
- }
-
-
-
-
-
- /**********************************************************************/
- /***** Pixel packing/unpacking *****/
- /**********************************************************************/
-
-
-
- /*
- * Unpack a 2-D pixel array/image. The unpacked format will be con-
- * tiguous (no "empty" bytes) with byte/bit swapping applied as needed.
- * Input: same as glDrawPixels
- * Output: pointer to block of pixel data in same format and type as input
- * or NULL if error.
- */
- GLvoid *gl_unpack_pixels( GLcontext *ctx,
- GLsizei width, GLsizei height,\
- GLenum format, GLenum type,
- const GLvoid *pixels )
- {
- GLint s, n;
-
- s = gl_sizeof_type( type );
- if (s<0) {
- gl_error( ctx, GL_INVALID_ENUM, "internal error in gl_unpack(type)" );
- return NULL;
- }
-
- n = gl_components_in_format( format );
- if (n<0) {
- gl_error( ctx, GL_INVALID_ENUM, "gl_unpack_pixels(format)" );
- return NULL;
- }
-
- if (type==GL_BITMAP) {
- /* BITMAP data */
- GLint bytes, i, width_in_bytes;
- GLubyte *buffer, *dst;
- GLvoid *src;
-
- /* Alloc dest storage */
- bytes = CEILING( width * height , 8 );
- buffer = (GLubyte *) malloc( bytes );
- if (!buffer) {
- return NULL;
- }
-
- /* Copy/unpack pixel data to buffer */
- width_in_bytes = CEILING( width, 8 );
- dst = buffer;
- for (i=0;i<height;i++) {
- src = gl_pixel_addr_in_image( &ctx->Unpack, pixels, width, height,
- format, type, 0, i, 0 );
- if (!src) {
- free(buffer);
- return NULL;
- }
- MEMCPY( dst, src, width_in_bytes );
- dst += width_in_bytes;
- }
-
- /* Bit flipping */
- if (ctx->Unpack.LsbFirst) {
- gl_flip_bytes( buffer, bytes );
- }
- return (GLvoid *) buffer;
- }
- else {
- /* Non-BITMAP data */
- GLint width_in_bytes, bytes, i;
- GLubyte *buffer, *dst;
- GLvoid *src;
-
- width_in_bytes = width * n * s;
-
- /* Alloc dest storage */
- bytes = height * width_in_bytes;
- buffer = (GLubyte *) malloc( bytes );
- if (!buffer) {
- return NULL;
- }
-
- /* Copy/unpack pixel data to buffer */
- dst = buffer;
- for (i=0;i<height;i++) {
- src = gl_pixel_addr_in_image( &ctx->Unpack, pixels, width, height,
- format, type, 0, i, 0 );
- if (!src) {
- free(buffer);
- return NULL;
- }
- MEMCPY( dst, src, width_in_bytes );
- dst += width_in_bytes;
- }
-
- /* Byte swapping */
- if (ctx->Unpack.SwapBytes && s>1) {
- if (s==2) {
- gl_swap2( (GLushort *) buffer, bytes/2 );
- }
- else if (s==4) {
- gl_swap4( (GLuint *) buffer, bytes/4 );
- }
- }
- return (GLvoid *) buffer;
- }
- }
-
-
-
-
- /*
- if (s>=a) {
- k = n * l;
- }
- else { *s<a*
- k = (a/s) * ceil( s*n*l / a );
- }
-
- s = size in bytes of a single component
- a = alignment
- n = number of components in a pixel
- l = number of pixels in a row
-
- k = number of components or indices between first pixel in each row in mem.
- */
-
-