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/* $Id: bitmap.c,v 1.2 1996/09/15 14:18:10 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 2.0
* Copyright (C) 1995-1996 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: bitmap.c,v $
* Revision 1.2 1996/09/15 14:18:10 brianp
* now use GLframebuffer and GLvisual
*
* Revision 1.1 1996/09/13 01:38:16 brianp
* Initial revision
*
*/
#include <stdlib.h>
#include <string.h>
#include "bitmap.h"
#include "context.h"
#include "feedback.h"
#include "image.h"
#include "macros.h"
#include "pb.h"
#include "types.h"
/*
* Unpack a bitmap image
*/
struct gl_image *gl_unpack_bitmap( GLcontext* ctx,
GLsizei width, GLsizei height,
const GLubyte *bitmap )
{
return gl_unpack_image( ctx, width, height, 0, GL_BITMAP, GL_BITMAP,
bitmap, GL_FALSE );
}
/*
* Do actual rendering of a bitmap.
*/
void gl_render_bitmap( GLcontext* ctx,
GLsizei width, GLsizei height,
GLfloat xorig, GLfloat yorig,
GLfloat xmove, GLfloat ymove,
const struct gl_image *bitmap )
{
struct pixel_buffer *PB = ctx->PB;
GLint bx, by; /* bitmap position */
GLint px, py, pz; /* pixel position */
GLubyte *ptr;
if (ctx->NewState) {
gl_update_state(ctx);
PB_INIT( PB, GL_BITMAP );
}
if (ctx->Visual->RGBAflag) {
GLint r, g, b, a;
r = (GLint) (ctx->Current.RasterColor[0] * ctx->Visual->RedScale);
g = (GLint) (ctx->Current.RasterColor[1] * ctx->Visual->GreenScale);
b = (GLint) (ctx->Current.RasterColor[2] * ctx->Visual->BlueScale);
a = (GLint) (ctx->Current.RasterColor[3] * ctx->Visual->AlphaScale);
PB_SET_COLOR( ctx, PB, r, g, b, a );
}
else {
PB_SET_INDEX( ctx, PB, ctx->Current.RasterIndex );
}
px = (GLint) ( (ctx->Current.RasterPos[0] - xorig) + 0.0F );
py = (GLint) ( (ctx->Current.RasterPos[1] - yorig) + 0.0F );
pz = (GLint) ( ctx->Current.RasterPos[2] * DEPTH_SCALE );
ptr = (GLubyte *) bitmap->Data;
for (by=0;by<height;by++) {
GLubyte bitmask;
/* do a row */
bitmask = 128;
for (bx=0;bx<width;bx++) {
if (*ptr&bitmask) {
PB_WRITE_PIXEL( PB, px+bx, py+by, pz );
}
bitmask = bitmask >> 1;
if (bitmask==0) {
ptr++;
bitmask = 128;
}
}
PB_CHECK_FLUSH( ctx, PB )
/* get ready for next row */
if (bitmask!=128) ptr++;
}
gl_flush_pb(ctx);
}
/*
* Execute a glBitmap command:
* 1. check for errors
* 2. feedback/render/select
* 3. advance raster position
*/
void gl_Bitmap( GLcontext* ctx,
GLsizei width, GLsizei height,
GLfloat xorig, GLfloat yorig,
GLfloat xmove, GLfloat ymove,
const struct gl_image *bitmap )
{
if (width<0 || height<0) {
gl_error( ctx, GL_INVALID_VALUE, "glBitmap" );
return;
}
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glBitmap" );
return;
}
if (ctx->Current.RasterPosValid==GL_FALSE) {
/* do nothing */
return;
}
if (ctx->RenderMode==GL_RENDER) {
GLboolean completed = GL_FALSE;
if (ctx->Driver.Bitmap) {
/* let device driver try to render the bitmap */
completed = (*ctx->Driver.Bitmap)( ctx, width, height, xorig, yorig,
xmove, ymove, bitmap );
}
if (!completed) {
/* use generic function */
gl_render_bitmap( ctx, width, height, xorig, yorig,
xmove, ymove, bitmap );
}
}
else if (ctx->RenderMode==GL_FEEDBACK) {
GLfloat color[4], texcoord[4], invq;
color[0] = ctx->Current.IntColor[0] * ctx->Visual->InvRedScale;
color[1] = ctx->Current.IntColor[1] * ctx->Visual->InvGreenScale;
color[2] = ctx->Current.IntColor[2] * ctx->Visual->InvBlueScale;
color[3] = ctx->Current.IntColor[3] * ctx->Visual->InvAlphaScale;
invq = 1.0F / ctx->Current.TexCoord[3];
texcoord[0] = ctx->Current.TexCoord[0] * invq;
texcoord[1] = ctx->Current.TexCoord[1] * invq;
texcoord[2] = ctx->Current.TexCoord[2] * invq;
texcoord[3] = ctx->Current.TexCoord[3];
FEEDBACK_TOKEN( ctx, (GLfloat) GL_BITMAP_TOKEN );
/* TODO: Verify XYZW values are correct: */
gl_feedback_vertex( ctx, ctx->Current.RasterPos[0] - xorig,
ctx->Current.RasterPos[1] - yorig,
ctx->Current.RasterPos[2],
ctx->Current.RasterPos[3],
color, ctx->Current.Index, texcoord );
}
else if (ctx->RenderMode==GL_SELECT) {
/* Bitmaps don't generate selection hits. See appendix B of 1.1 spec. */
}
/* update raster position */
ctx->Current.RasterPos[0] += xmove;
ctx->Current.RasterPos[1] += ymove;
}
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