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/* $Id: misc.c,v 1.5 1996/10/02 02:51:44 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: misc.c,v $
* Revision 1.5 1996/10/02 02:51:44 brianp
* created clear_color_buffers() which handles draw mode GL_FRONT_AND_BACK
*
* Revision 1.4 1996/09/25 03:22:14 brianp
* glDrawBuffer(GL_NONE) works now
*
* Revision 1.3 1996/09/24 00:16:10 brianp
* set NewState flag in glRead/DrawBuffer() and glHint()
* fixed display list bug in gl_Hint()
*
* Revision 1.2 1996/09/15 14:18:37 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 "accum.h"
#include "alphabuf.h"
#include "context.h"
#include "depth.h"
#include "macros.h"
#include "masking.h"
#include "misc.h"
#include "stencil.h"
#include "types.h"
void gl_ClearIndex( GLcontext *ctx, GLfloat c )
{
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glClearIndex" );
return;
}
ctx->Color.ClearIndex = (GLuint) c;
if (!ctx->Visual->RGBAflag) {
/* it's OK to call glClearIndex in RGBA mode but it should be a NOP */
(*ctx->Driver.ClearIndex)( ctx, ctx->Color.ClearIndex );
}
}
void gl_ClearColor( GLcontext *ctx, GLclampf red, GLclampf green,
GLclampf blue, GLclampf alpha )
{
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glClearColor" );
return;
}
ctx->Color.ClearColor[0] = CLAMP( red, 0.0F, 1.0F );
ctx->Color.ClearColor[1] = CLAMP( green, 0.0F, 1.0F );
ctx->Color.ClearColor[2] = CLAMP( blue, 0.0F, 1.0F );
ctx->Color.ClearColor[3] = CLAMP( alpha, 0.0F, 1.0F );
if (ctx->Visual->RGBAflag) {
GLubyte r = (GLint) (ctx->Color.ClearColor[0] * ctx->Visual->RedScale);
GLubyte g = (GLint) (ctx->Color.ClearColor[1] * ctx->Visual->GreenScale);
GLubyte b = (GLint) (ctx->Color.ClearColor[2] * ctx->Visual->BlueScale);
GLubyte a = (GLint) (ctx->Color.ClearColor[3] * ctx->Visual->AlphaScale);
(*ctx->Driver.ClearColor)( ctx, r, g, b, a );
}
}
/*
* Clear the color buffer when glColorMask or glIndexMask is in effect.
*/
static void clear_color_buffer_with_masking( GLcontext *ctx )
{
GLint x, y, height, width;
/* Compute region to clear */
if (ctx->Scissor.Enabled) {
x = ctx->Buffer->Xmin;
y = ctx->Buffer->Ymin;
height = ctx->Buffer->Ymax - ctx->Buffer->Ymin + 1;
width = ctx->Buffer->Xmax - ctx->Buffer->Xmin + 1;
}
else {
x = 0;
y = 0;
height = ctx->Buffer->Height;
width = ctx->Buffer->Width;
}
if (ctx->Visual->RGBAflag) {
/* RGBA mode */
GLubyte red[MAX_WIDTH], green[MAX_WIDTH];
GLubyte blue[MAX_WIDTH], alpha[MAX_WIDTH];
GLubyte r = ctx->Color.ClearColor[0] * ctx->Visual->RedScale;
GLubyte g = ctx->Color.ClearColor[1] * ctx->Visual->GreenScale;
GLubyte b = ctx->Color.ClearColor[2] * ctx->Visual->BlueScale;
GLubyte a = ctx->Color.ClearColor[3] * ctx->Visual->AlphaScale;
GLint i;
for (i=0;i<height;i++,y++) {
MEMSET( red, (int) r, width );
MEMSET( green, (int) g, width );
MEMSET( blue, (int) b, width );
MEMSET( alpha, (int) a, width );
gl_mask_color_span( ctx, width, x, y, red, green, blue, alpha );
(*ctx->Driver.WriteColorSpan)( ctx,
width, x, y, red, green, blue, alpha, NULL );
if (ctx->RasterMask & ALPHABUF_BIT) {
gl_write_alpha_span( ctx, width, x, y, alpha, NULL );
}
}
}
else {
/* Color index mode */
GLuint indx[MAX_WIDTH];
GLubyte mask[MAX_WIDTH];
GLint i, j;
MEMSET( mask, 1, width );
for (i=0;i<height;i++,y++) {
for (j=0;j<width;j++) {
indx[j] = ctx->Color.ClearIndex;
}
gl_mask_index_span( ctx, width, x, y, indx );
(*ctx->Driver.WriteIndexSpan)( ctx, width, x, y, indx, mask );
}
}
}
/*
* Clear the front and/or back color buffers. Also clear the alpha
* buffer(s) if present.
*/
static void clear_color_buffers( GLcontext *ctx )
{
if (ctx->Color.SWmasking) {
clear_color_buffer_with_masking( ctx );
}
else {
(*ctx->Driver.Clear)( ctx,
!ctx->Scissor.Enabled,
ctx->Scissor.X, ctx->Scissor.Y,
ctx->Scissor.Width, ctx->Scissor.Height );
if (ctx->RasterMask & ALPHABUF_BIT) {
/* front and/or back alpha buffers will be cleared here */
gl_clear_alpha_buffers( ctx );
}
}
if (ctx->RasterMask & FRONT_AND_BACK_BIT) {
/*** Also clear the back buffer ***/
(*ctx->Driver.SetBuffer)( ctx, GL_BACK );
if (ctx->Color.SWmasking) {
clear_color_buffer_with_masking( ctx );
}
else {
(*ctx->Driver.Clear)( ctx,
!ctx->Scissor.Enabled,
ctx->Scissor.X, ctx->Scissor.Y,
ctx->Scissor.Width, ctx->Scissor.Height );
}
(*ctx->Driver.SetBuffer)( ctx, GL_FRONT );
}
}
void gl_Clear( GLcontext *ctx, GLbitfield mask )
{
#ifdef PROFILE
GLdouble t0 = gl_time();
#endif
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glClear" );
return;
}
if (ctx->NewState) {
gl_update_state( ctx );
}
if (mask & GL_COLOR_BUFFER_BIT) clear_color_buffers( ctx );
if (mask & GL_DEPTH_BUFFER_BIT) (*ctx->Driver.ClearDepthBuffer)( ctx );
if (mask & GL_ACCUM_BUFFER_BIT) gl_clear_accum_buffer( ctx );
if (mask & GL_STENCIL_BUFFER_BIT) gl_clear_stencil_buffer( ctx );
#ifdef PROFILE
ctx->ClearTime += gl_time() - t0;
ctx->ClearCount++;
#endif
}
const GLubyte *gl_GetString( GLcontext *ctx, GLenum name )
{
static char *vendor = "Brian Paul";
static char *renderer = "Mesa";
static char *version = "1.1 Mesa 2.0";
static char *extensions = "GL_EXT_blend_color GL_EXT_blend_minmax GL_EXT_blend_logic_op GL_EXT_blend_subtract GL_EXT_vertex_array GL_MESA_window_pos";
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glGetString" );
return (GLubyte *) 0;
}
switch (name) {
case GL_VENDOR:
return (GLubyte *) vendor;
case GL_RENDERER:
return (GLubyte *) renderer;
case GL_VERSION:
return (GLubyte *) version;
case GL_EXTENSIONS:
return (GLubyte *) extensions;
default:
gl_error( ctx, GL_INVALID_ENUM, "glGetString" );
return (GLubyte *) 0;
}
}
void gl_Finish( GLcontext *ctx )
{
/* Don't compile into display list */
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glFinish" );
return;
}
if (ctx->Driver.Finish) {
(*ctx->Driver.Finish)( ctx );
}
}
void gl_Flush( GLcontext *ctx )
{
/* Don't compile into display list */
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glFlush" );
return;
}
if (ctx->Driver.Flush) {
(*ctx->Driver.Flush)( ctx );
}
}
void gl_Hint( GLcontext *ctx, GLenum target, GLenum mode )
{
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glHint" );
return;
}
if (mode!=GL_DONT_CARE && mode!=GL_FASTEST && mode!=GL_NICEST) {
gl_error( ctx, GL_INVALID_ENUM, "glHint(mode)" );
return;
}
switch (target) {
case GL_FOG_HINT:
ctx->Hint.Fog = mode;
break;
case GL_LINE_SMOOTH_HINT:
ctx->Hint.LineSmooth = mode;
break;
case GL_PERSPECTIVE_CORRECTION_HINT:
ctx->Hint.PerspectiveCorrection = mode;
break;
case GL_POINT_SMOOTH_HINT:
ctx->Hint.PointSmooth = mode;
break;
case GL_POLYGON_SMOOTH_HINT:
ctx->Hint.PolygonSmooth = mode;
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glHint(target)" );
}
ctx->NewState |= NEW_ALL; /* just to be safe */
}
void gl_DrawBuffer( GLcontext *ctx, GLenum mode )
{
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
return;
}
switch (mode) {
case GL_FRONT:
case GL_FRONT_LEFT:
case GL_FRONT_AND_BACK:
if ( (*ctx->Driver.SetBuffer)( ctx, GL_FRONT ) == GL_FALSE ) {
gl_error( ctx, GL_INVALID_ENUM, "glDrawBuffer" );
return;
}
ctx->Color.DrawBuffer = mode;
ctx->Buffer->Alpha = ctx->Buffer->FrontAlpha;
ctx->NewState |= NEW_RASTER_OPS;
break;
case GL_BACK:
case GL_BACK_LEFT:
if ( (*ctx->Driver.SetBuffer)( ctx, GL_BACK ) == GL_FALSE) {
gl_error( ctx, GL_INVALID_ENUM, "glDrawBuffer" );
return;
}
ctx->Color.DrawBuffer = mode;
ctx->Buffer->Alpha = ctx->Buffer->BackAlpha;
ctx->NewState |= NEW_RASTER_OPS;
break;
case GL_NONE:
ctx->Color.DrawBuffer = mode;
ctx->Buffer->Alpha = NULL;
ctx->NewState |= NEW_RASTER_OPS;
break;
case GL_FRONT_RIGHT:
case GL_BACK_RIGHT:
case GL_LEFT:
case GL_RIGHT:
case GL_AUX0:
gl_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glDrawBuffer" );
}
}
void gl_ReadBuffer( GLcontext *ctx, GLenum mode )
{
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" );
return;
}
switch (mode) {
case GL_FRONT:
case GL_FRONT_LEFT:
if ( (*ctx->Driver.SetBuffer)( ctx, GL_FRONT ) == GL_FALSE) {
gl_error( ctx, GL_INVALID_ENUM, "glReadBuffer" );
return;
}
ctx->Pixel.ReadBuffer = mode;
ctx->Buffer->Alpha = ctx->Buffer->FrontAlpha;
ctx->NewState |= NEW_RASTER_OPS;
break;
case GL_BACK:
case GL_BACK_LEFT:
if ( (*ctx->Driver.SetBuffer)( ctx, GL_BACK ) == GL_FALSE) {
gl_error( ctx, GL_INVALID_ENUM, "glReadBuffer" );
return;
}
ctx->Pixel.ReadBuffer = mode;
ctx->Buffer->Alpha = ctx->Buffer->BackAlpha;
ctx->NewState |= NEW_RASTER_OPS;
break;
case GL_FRONT_RIGHT:
case GL_BACK_RIGHT:
case GL_LEFT:
case GL_RIGHT:
case GL_AUX0:
gl_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" );
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glReadBuffer" );
}
/* Remember, the draw buffer is the default state */
(void) (*ctx->Driver.SetBuffer)( ctx, ctx->Color.DrawBuffer );
}
void gl_Rectf( GLcontext *ctx, GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2 )
{
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glRect" );
return;
}
(*ctx->API.Begin)( ctx, GL_QUADS );
(*ctx->API.Vertex4f)( ctx, x1, y1, 0.0F, 1.0F );
(*ctx->API.Vertex4f)( ctx, x2, y1, 0.0F, 1.0F );
(*ctx->API.Vertex4f)( ctx, x2, y2, 0.0F, 1.0F );
(*ctx->API.Vertex4f)( ctx, x1, y2, 0.0F, 1.0F );
(*ctx->API.End)( ctx );
}
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