mirror of
https://github.com/reactos/reactos.git
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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
222 lines
6.3 KiB
C
222 lines
6.3 KiB
C
/* $Id: bitmap.c,v 1.9 1998/02/03 23:45:02 brianp Exp $ */
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/*
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* Mesa 3-D graphics library
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* Version: 2.5
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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: bitmap.c,v $
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* Revision 1.9 1998/02/03 23:45:02 brianp
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* added casts to prevent warnings with Amiga StormC compiler
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*
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* Revision 1.8 1997/10/02 03:06:42 brianp
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* added #include <assert.h>
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*
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* Revision 1.7 1997/09/27 00:15:39 brianp
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* changed parameters to gl_unpack_image()
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*
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* Revision 1.6 1997/07/24 01:24:45 brianp
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* changed precompiled header symbol from PCH to PC_HEADER
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*
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* Revision 1.5 1997/06/20 02:18:09 brianp
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* replaced Current.IntColor with Current.ByteColor
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*
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* Revision 1.4 1997/05/28 03:23:48 brianp
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* added precompiled header (PCH) support
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*
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* Revision 1.3 1996/11/06 04:23:18 brianp
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* replaced 0 with GL_COLOR_INDEX in gl_unpack_bitmap()
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*
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* Revision 1.2 1996/09/15 14:18:10 brianp
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* now use GLframebuffer and GLvisual
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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 <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include "bitmap.h"
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#include "context.h"
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#include "feedback.h"
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#include "image.h"
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#include "macros.h"
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#include "pb.h"
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#include "types.h"
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#endif
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/*
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* Unpack a bitmap image
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*/
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struct gl_image *gl_unpack_bitmap( GLcontext* ctx,
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GLsizei width, GLsizei height,
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const GLubyte *bitmap )
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{
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return gl_unpack_image( ctx, width, height,
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GL_COLOR_INDEX, GL_BITMAP, bitmap );
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}
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/*
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* Do actual rendering of a bitmap.
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*/
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void gl_render_bitmap( GLcontext* ctx,
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GLsizei width, GLsizei height,
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GLfloat xorig, GLfloat yorig,
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GLfloat xmove, GLfloat ymove,
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const struct gl_image *bitmap )
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{
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struct pixel_buffer *PB = ctx->PB;
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GLint bx, by; /* bitmap position */
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GLint px, py, pz; /* pixel position */
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GLubyte *ptr;
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assert(bitmap);
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assert(bitmap->Type == GL_BITMAP);
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assert(bitmap->Format == GL_COLOR_INDEX);
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if (ctx->NewState) {
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gl_update_state(ctx);
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PB_INIT( PB, GL_BITMAP );
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}
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if (ctx->Visual->RGBAflag) {
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GLint r, g, b, a;
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r = (GLint) (ctx->Current.RasterColor[0] * ctx->Visual->RedScale);
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g = (GLint) (ctx->Current.RasterColor[1] * ctx->Visual->GreenScale);
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b = (GLint) (ctx->Current.RasterColor[2] * ctx->Visual->BlueScale);
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a = (GLint) (ctx->Current.RasterColor[3] * ctx->Visual->AlphaScale);
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PB_SET_COLOR( ctx, PB, r, g, b, a );
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}
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else {
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PB_SET_INDEX( ctx, PB, ctx->Current.RasterIndex );
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}
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px = (GLint) ( (ctx->Current.RasterPos[0] - xorig) + 0.0F );
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py = (GLint) ( (ctx->Current.RasterPos[1] - yorig) + 0.0F );
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pz = (GLint) ( ctx->Current.RasterPos[2] * DEPTH_SCALE );
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ptr = (GLubyte *) bitmap->Data;
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for (by=0;by<height;by++) {
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GLubyte bitmask;
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/* do a row */
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bitmask = 128;
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for (bx=0;bx<width;bx++) {
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if (*ptr&bitmask) {
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PB_WRITE_PIXEL( PB, px+bx, py+by, pz );
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}
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bitmask = bitmask >> 1;
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if (bitmask==0) {
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ptr++;
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bitmask = 128;
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}
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}
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PB_CHECK_FLUSH( ctx, PB )
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/* get ready for next row */
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if (bitmask!=128) ptr++;
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}
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gl_flush_pb(ctx);
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}
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/*
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* Execute a glBitmap command:
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* 1. check for errors
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* 2. feedback/render/select
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* 3. advance raster position
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*/
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void gl_Bitmap( GLcontext* ctx,
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GLsizei width, GLsizei height,
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GLfloat xorig, GLfloat yorig,
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GLfloat xmove, GLfloat ymove,
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const struct gl_image *bitmap )
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{
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if (width<0 || height<0) {
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gl_error( ctx, GL_INVALID_VALUE, "glBitmap" );
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return;
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}
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if (INSIDE_BEGIN_END(ctx)) {
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gl_error( ctx, GL_INVALID_OPERATION, "glBitmap" );
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return;
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}
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if (ctx->Current.RasterPosValid==GL_FALSE) {
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/* do nothing */
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return;
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}
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if (ctx->RenderMode==GL_RENDER) {
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GLboolean completed = GL_FALSE;
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if (ctx->Driver.Bitmap) {
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/* let device driver try to render the bitmap */
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completed = (*ctx->Driver.Bitmap)( ctx, width, height, xorig, yorig,
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xmove, ymove, bitmap );
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}
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if (!completed) {
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/* use generic function */
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gl_render_bitmap( ctx, width, height, xorig, yorig,
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xmove, ymove, bitmap );
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}
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}
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else if (ctx->RenderMode==GL_FEEDBACK) {
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GLfloat color[4], texcoord[4], invq;
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color[0] = ctx->Current.ByteColor[0] * ctx->Visual->InvRedScale;
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color[1] = ctx->Current.ByteColor[1] * ctx->Visual->InvGreenScale;
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color[2] = ctx->Current.ByteColor[2] * ctx->Visual->InvBlueScale;
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color[3] = ctx->Current.ByteColor[3] * ctx->Visual->InvAlphaScale;
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invq = 1.0F / ctx->Current.TexCoord[3];
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texcoord[0] = ctx->Current.TexCoord[0] * invq;
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texcoord[1] = ctx->Current.TexCoord[1] * invq;
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texcoord[2] = ctx->Current.TexCoord[2] * invq;
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texcoord[3] = ctx->Current.TexCoord[3];
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FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_BITMAP_TOKEN );
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/* TODO: Verify XYZW values are correct: */
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gl_feedback_vertex( ctx, ctx->Current.RasterPos[0] - xorig,
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ctx->Current.RasterPos[1] - yorig,
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ctx->Current.RasterPos[2],
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ctx->Current.RasterPos[3],
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color, ctx->Current.Index, texcoord );
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}
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else if (ctx->RenderMode==GL_SELECT) {
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/* Bitmaps don't generate selection hits. See appendix B of 1.1 spec. */
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}
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/* update raster position */
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ctx->Current.RasterPos[0] += xmove;
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ctx->Current.RasterPos[1] += ymove;
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}
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