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![Jérôme Gardou](/assets/img/avatar_default.png)
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
374 lines
11 KiB
C
374 lines
11 KiB
C
/* $Id: accum.c,v 1.5 1997/07/24 01:24:28 brianp Exp $ */
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/*
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* Mesa 3-D graphics library
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* Version: 2.4
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* Copyright (C) 1995-1997 Brian Paul
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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* $Log: accum.c,v $
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* Revision 1.5 1997/07/24 01:24:28 brianp
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* changed precompiled header symbol from PCH to PC_HEADER
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*
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* Revision 1.4 1997/05/28 03:23:09 brianp
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* added precompiled header (PCH) support
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*
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* Revision 1.3 1997/04/30 01:54:48 brianp
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* call gl_warning() if calling gl_Accum w/out accum buffer
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*
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* Revision 1.2 1996/09/15 14:19:44 brianp
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* now use GLframebuffer and GLvisual
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* added gl_alloc_accum_buffer()
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*
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* Revision 1.1 1996/09/13 01:38:16 brianp
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* Initial revision
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*
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*/
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#ifdef PC_HEADER
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#include "all.h"
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#else
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include "accum.h"
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#include "context.h"
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#include "dlist.h"
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#include "macros.h"
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#include "types.h"
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#endif
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void gl_alloc_accum_buffer( GLcontext *ctx )
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{
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GLint n;
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if (ctx->Buffer->Accum) {
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free( ctx->Buffer->Accum );
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ctx->Buffer->Accum = NULL;
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}
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/* allocate accumulation buffer if not already present */
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n = ctx->Buffer->Width * ctx->Buffer->Height * 4 * sizeof(GLaccum);
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ctx->Buffer->Accum = (GLaccum *) malloc( n );
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if (!ctx->Buffer->Accum) {
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/* unable to setup accumulation buffer */
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gl_error( ctx, GL_OUT_OF_MEMORY, "glAccum" );
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}
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}
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void gl_ClearAccum( GLcontext *ctx,
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GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha )
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{
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if (INSIDE_BEGIN_END(ctx)) {
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gl_error( ctx, GL_INVALID_OPERATION, "glAccum" );
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return;
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}
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ctx->Accum.ClearColor[0] = CLAMP( red, -1.0, 1.0 );
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ctx->Accum.ClearColor[1] = CLAMP( green, -1.0, 1.0 );
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ctx->Accum.ClearColor[2] = CLAMP( blue, -1.0, 1.0 );
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ctx->Accum.ClearColor[3] = CLAMP( alpha, -1.0, 1.0 );
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}
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void gl_Accum( GLcontext *ctx, GLenum op, GLfloat value )
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{
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GLuint xpos, ypos, width, height;
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GLfloat acc_scale;
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if (INSIDE_BEGIN_END(ctx)) {
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gl_error( ctx, GL_INVALID_OPERATION, "glAccum" );
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return;
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}
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if (ctx->Visual->AccumBits==0 || !ctx->Buffer->Accum) {
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/* No accumulation buffer! */
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gl_warning(ctx, "Calling glAccum() without an accumulation buffer");
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return;
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}
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if (sizeof(GLaccum)==1) {
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acc_scale = 127.0;
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}
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else if (sizeof(GLaccum)==2) {
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acc_scale = 32767.0;
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}
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else {
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/* sizeof(GLaccum) > 2 (Cray) */
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acc_scale = (float) SHRT_MAX;
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}
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/* Determine region to operate upon. */
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if (ctx->Scissor.Enabled) {
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xpos = ctx->Scissor.X;
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ypos = ctx->Scissor.Y;
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width = ctx->Scissor.Width;
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height = ctx->Scissor.Height;
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}
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else {
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/* whole window */
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xpos = 0;
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ypos = 0;
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width = ctx->Buffer->Width;
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height = ctx->Buffer->Height;
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}
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switch (op) {
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case GL_ADD:
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{
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GLaccum ival, *acc;
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GLuint i, j;
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ival = (GLaccum) (value * acc_scale);
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for (j=0;j<height;j++) {
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acc = ctx->Buffer->Accum
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+ (ypos * ctx->Buffer->Width + xpos) * 4;
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for (i=0;i<width;i++) {
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*acc += ival; acc++; /* red */
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*acc += ival; acc++; /* green */
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*acc += ival; acc++; /* blue */
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*acc += ival; acc++; /* alpha */
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}
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ypos++;
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}
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}
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break;
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case GL_MULT:
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{
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GLaccum *acc;
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GLuint i, j;
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for (j=0;j<height;j++) {
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acc = ctx->Buffer->Accum
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+ (ypos * ctx->Buffer->Width + xpos) * 4;
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for (i=0;i<width;i++) {
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*acc = (GLaccum) ( (GLfloat) *acc * value ); acc++; /*r*/
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*acc = (GLaccum) ( (GLfloat) *acc * value ); acc++; /*g*/
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*acc = (GLaccum) ( (GLfloat) *acc * value ); acc++; /*g*/
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*acc = (GLaccum) ( (GLfloat) *acc * value ); acc++; /*a*/
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}
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ypos++;
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}
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}
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break;
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case GL_ACCUM:
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{
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GLaccum *acc;
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GLubyte red[MAX_WIDTH], green[MAX_WIDTH];
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GLubyte blue[MAX_WIDTH], alpha[MAX_WIDTH];
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GLfloat rscale, gscale, bscale, ascale;
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GLuint i, j;
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(void) (*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.ReadBuffer );
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/* Accumulate */
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rscale = value * acc_scale * ctx->Visual->InvRedScale;
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gscale = value * acc_scale * ctx->Visual->InvGreenScale;
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bscale = value * acc_scale * ctx->Visual->InvBlueScale;
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ascale = value * acc_scale * ctx->Visual->InvAlphaScale;
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for (j=0;j<height;j++) {
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(*ctx->Driver.ReadColorSpan)( ctx, width, xpos, ypos,
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red, green, blue, alpha);
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acc = ctx->Buffer->Accum
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+ (ypos * ctx->Buffer->Width + xpos) * 4;
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for (i=0;i<width;i++) {
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*acc += (GLaccum) ( (GLfloat) red[i] * rscale ); acc++;
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*acc += (GLaccum) ( (GLfloat) green[i] * gscale ); acc++;
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*acc += (GLaccum) ( (GLfloat) blue[i] * bscale ); acc++;
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*acc += (GLaccum) ( (GLfloat) alpha[i] * ascale ); acc++;
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}
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ypos++;
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}
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(void) (*ctx->Driver.SetBuffer)( ctx, ctx->Color.DrawBuffer );
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}
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break;
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case GL_LOAD:
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{
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GLaccum *acc;
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GLubyte red[MAX_WIDTH], green[MAX_WIDTH];
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GLubyte blue[MAX_WIDTH], alpha[MAX_WIDTH];
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GLfloat rscale, gscale, bscale, ascale;
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GLuint i, j;
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(void) (*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.ReadBuffer );
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/* Load accumulation buffer */
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rscale = value * acc_scale * ctx->Visual->InvRedScale;
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gscale = value * acc_scale * ctx->Visual->InvGreenScale;
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bscale = value * acc_scale * ctx->Visual->InvBlueScale;
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ascale = value * acc_scale * ctx->Visual->InvAlphaScale;
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for (j=0;j<height;j++) {
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(*ctx->Driver.ReadColorSpan)( ctx, width, xpos, ypos,
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red, green, blue, alpha);
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acc = ctx->Buffer->Accum
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+ (ypos * ctx->Buffer->Width + xpos) * 4;
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for (i=0;i<width;i++) {
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*acc++ = (GLaccum) ( (GLfloat) red[i] * rscale );
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*acc++ = (GLaccum) ( (GLfloat) green[i] * gscale );
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*acc++ = (GLaccum) ( (GLfloat) blue[i] * bscale );
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*acc++ = (GLaccum) ( (GLfloat) alpha[i] * ascale );
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}
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ypos++;
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}
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(void) (*ctx->Driver.SetBuffer)( ctx, ctx->Color.DrawBuffer );
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}
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break;
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case GL_RETURN:
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{
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GLubyte red[MAX_WIDTH], green[MAX_WIDTH];
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GLubyte blue[MAX_WIDTH], alpha[MAX_WIDTH];
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GLaccum *acc;
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GLfloat rscale, gscale, bscale, ascale;
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GLint rmax, gmax, bmax, amax;
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GLuint i, j;
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rscale = value / acc_scale * ctx->Visual->RedScale;
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gscale = value / acc_scale * ctx->Visual->GreenScale;
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bscale = value / acc_scale * ctx->Visual->BlueScale;
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ascale = value / acc_scale * ctx->Visual->AlphaScale;
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rmax = (GLint) ctx->Visual->RedScale;
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gmax = (GLint) ctx->Visual->GreenScale;
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bmax = (GLint) ctx->Visual->BlueScale;
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amax = (GLint) ctx->Visual->AlphaScale;
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for (j=0;j<height;j++) {
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acc = ctx->Buffer->Accum
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+ (ypos * ctx->Buffer->Width + xpos) * 4;
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for (i=0;i<width;i++) {
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GLint r, g, b, a;
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r = (GLint) ( (GLfloat) (*acc++) * rscale + 0.5F );
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g = (GLint) ( (GLfloat) (*acc++) * gscale + 0.5F );
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b = (GLint) ( (GLfloat) (*acc++) * bscale + 0.5F );
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a = (GLint) ( (GLfloat) (*acc++) * ascale + 0.5F );
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red[i] = CLAMP( r, 0, rmax );
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green[i] = CLAMP( g, 0, gmax );
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blue[i] = CLAMP( b, 0, bmax );
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alpha[i] = CLAMP( a, 0, amax );
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}
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(*ctx->Driver.WriteColorSpan)( ctx, width, xpos, ypos,
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red, green, blue, alpha, NULL );
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ypos++;
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}
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}
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break;
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default:
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gl_error( ctx, GL_INVALID_ENUM, "glAccum" );
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}
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}
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/*
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* Clear the accumulation Buffer->
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*/
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void gl_clear_accum_buffer( GLcontext *ctx )
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{
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GLuint buffersize;
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GLfloat acc_scale;
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if (ctx->Visual->AccumBits==0) {
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/* No accumulation buffer! */
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return;
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}
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if (sizeof(GLaccum)==1) {
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acc_scale = 127.0;
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}
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else if (sizeof(GLaccum)==2) {
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acc_scale = 32767.0;
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}
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else {
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/* sizeof(GLaccum) > 2 (Cray) */
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acc_scale = (float) SHRT_MAX;
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}
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/* number of pixels */
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buffersize = ctx->Buffer->Width * ctx->Buffer->Height;
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if (!ctx->Buffer->Accum) {
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/* try to alloc accumulation buffer */
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ctx->Buffer->Accum = (GLaccum *)
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malloc( buffersize * 4 * sizeof(GLaccum) );
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}
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if (ctx->Buffer->Accum) {
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if (ctx->Scissor.Enabled) {
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/* Limit clear to scissor box */
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GLaccum r, g, b, a;
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GLint i, j;
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GLint width, height;
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GLaccum *row;
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r = (GLaccum) (ctx->Accum.ClearColor[0] * acc_scale);
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g = (GLaccum) (ctx->Accum.ClearColor[1] * acc_scale);
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b = (GLaccum) (ctx->Accum.ClearColor[2] * acc_scale);
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a = (GLaccum) (ctx->Accum.ClearColor[3] * acc_scale);
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/* size of region to clear */
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width = 4 * (ctx->Buffer->Xmax - ctx->Buffer->Xmin + 1);
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height = ctx->Buffer->Ymax - ctx->Buffer->Ymin + 1;
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/* ptr to first element to clear */
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row = ctx->Buffer->Accum
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+ 4 * (ctx->Buffer->Ymin * ctx->Buffer->Width
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+ ctx->Buffer->Xmin);
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for (j=0;j<height;j++) {
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for (i=0;i<width;i+=4) {
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row[i+0] = r;
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row[i+1] = g;
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row[i+2] = b;
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row[i+3] = a;
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}
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row += 4 * ctx->Buffer->Width;
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}
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}
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else {
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/* clear whole buffer */
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if (ctx->Accum.ClearColor[0]==0.0 &&
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ctx->Accum.ClearColor[1]==0.0 &&
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ctx->Accum.ClearColor[2]==0.0 &&
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ctx->Accum.ClearColor[3]==0.0) {
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/* Black */
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MEMSET( ctx->Buffer->Accum, 0, buffersize * 4 * sizeof(GLaccum) );
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}
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else {
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/* Not black */
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GLaccum *acc, r, g, b, a;
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GLuint i;
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acc = ctx->Buffer->Accum;
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r = (GLaccum) (ctx->Accum.ClearColor[0] * acc_scale);
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g = (GLaccum) (ctx->Accum.ClearColor[1] * acc_scale);
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b = (GLaccum) (ctx->Accum.ClearColor[2] * acc_scale);
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a = (GLaccum) (ctx->Accum.ClearColor[3] * acc_scale);
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for (i=0;i<buffersize;i++) {
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*acc++ = r;
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*acc++ = g;
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*acc++ = b;
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*acc++ = a;
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}
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}
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}
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}
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}
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