mirror of
https://github.com/reactos/reactos.git
synced 2024-06-28 17:01:28 +00:00
5f2bebf7a5
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
143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
/* $Id: alpha.c,v 1.5 1997/07/24 01:24:28 brianp Exp $ */
|
|
|
|
/*
|
|
* Mesa 3-D graphics library
|
|
* Version: 2.4
|
|
* 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: alpha.c,v $
|
|
* Revision 1.5 1997/07/24 01:24:28 brianp
|
|
* changed precompiled header symbol from PCH to PC_HEADER
|
|
*
|
|
* Revision 1.4 1997/05/28 03:23:09 brianp
|
|
* added precompiled header (PCH) support
|
|
*
|
|
* Revision 1.3 1997/03/13 03:07:53 brianp
|
|
* optimized gl_alpha_test() by removing conditional from inside loops
|
|
*
|
|
* Revision 1.2 1996/09/15 14:15:54 brianp
|
|
* now use GLframebuffer and GLvisual
|
|
*
|
|
* Revision 1.1 1996/09/13 01:38:16 brianp
|
|
* Initial revision
|
|
*
|
|
*/
|
|
|
|
|
|
#ifdef PC_HEADER
|
|
#include "all.h"
|
|
#else
|
|
#include "alpha.h"
|
|
#include "context.h"
|
|
#include "types.h"
|
|
#include "dlist.h"
|
|
#include "macros.h"
|
|
#endif
|
|
|
|
|
|
|
|
void gl_AlphaFunc( GLcontext* ctx, GLenum func, GLclampf ref )
|
|
{
|
|
if (INSIDE_BEGIN_END(ctx)) {
|
|
gl_error( ctx, GL_INVALID_OPERATION, "glAlphaFunc" );
|
|
return;
|
|
}
|
|
switch (func) {
|
|
case GL_NEVER:
|
|
case GL_LESS:
|
|
case GL_EQUAL:
|
|
case GL_LEQUAL:
|
|
case GL_GREATER:
|
|
case GL_NOTEQUAL:
|
|
case GL_GEQUAL:
|
|
case GL_ALWAYS:
|
|
ctx->Color.AlphaFunc = func;
|
|
ctx->Color.AlphaRef = CLAMP( ref, 0.0F, 1.0F );
|
|
ctx->Color.AlphaRefUbyte = (GLubyte) (ctx->Color.AlphaRef
|
|
* ctx->Visual->AlphaScale);
|
|
break;
|
|
default:
|
|
gl_error( ctx, GL_INVALID_ENUM, "glAlphaFunc(func)" );
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
* Apply the alpha test to a span of pixels.
|
|
* In/Out: mask - current pixel mask. Pixels which fail the alpha test
|
|
* will set the corresponding mask flag to 0.
|
|
* Return: 0 = all pixels in the span failed the alpha test.
|
|
* 1 = one or more pixels passed the alpha test.
|
|
*/
|
|
GLint gl_alpha_test( GLcontext* ctx,
|
|
GLuint n, const GLubyte alpha[], GLubyte mask[] )
|
|
{
|
|
GLuint i;
|
|
GLubyte ref = ctx->Color.AlphaRefUbyte;
|
|
|
|
/* switch cases ordered from most frequent to less frequent */
|
|
switch (ctx->Color.AlphaFunc) {
|
|
case GL_LESS:
|
|
for (i=0;i<n;i++) {
|
|
mask[i] &= (alpha[i] < ref);
|
|
}
|
|
return 1;
|
|
case GL_LEQUAL:
|
|
for (i=0;i<n;i++) {
|
|
mask[i] &= (alpha[i] <= ref);
|
|
}
|
|
return 1;
|
|
case GL_GEQUAL:
|
|
for (i=0;i<n;i++) {
|
|
mask[i] &= (alpha[i] >= ref);
|
|
}
|
|
return 1;
|
|
case GL_GREATER:
|
|
for (i=0;i<n;i++) {
|
|
mask[i] &= (alpha[i] > ref);
|
|
}
|
|
return 1;
|
|
case GL_NOTEQUAL:
|
|
for (i=0;i<n;i++) {
|
|
mask[i] &= (alpha[i] != ref);
|
|
}
|
|
return 1;
|
|
case GL_EQUAL:
|
|
for (i=0;i<n;i++) {
|
|
mask[i] &= (alpha[i] == ref);
|
|
}
|
|
return 1;
|
|
case GL_ALWAYS:
|
|
/* do nothing */
|
|
return 1;
|
|
case GL_NEVER:
|
|
/* caller should check for zero! */
|
|
return 0;
|
|
default:
|
|
gl_problem( ctx, "Invalid alpha test in gl_alpha_test" );
|
|
return 0;
|
|
}
|
|
/* Never get here */
|
|
return 1;
|
|
}
|