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FX
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fxlines.c
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1999-02-04
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/* -*- mode: C; tab-width:8; -*-
fxlines.c - 3Dfx VooDoo line functions
*/
/*
* 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.
*
* See the file fxapi.c for more informations about authors
*
*/
#if defined(FX)
#include "fxdrv.h"
/************************************************************************/
/************************* Lines functions ******************************/
/************************************************************************/
#define GOURAUD(v) { \
fxMesa->gWin[(v)].r=(float) VB->Color[(v)][0]; \
fxMesa->gWin[(v)].g=(float) VB->Color[(v)][1]; \
fxMesa->gWin[(v)].b=(float) VB->Color[(v)][2]; \
fxMesa->gWin[(v)].a=(float) VB->Color[(v)][3]; \
}
static void fxLineSmooth(GLcontext *ctx, GLuint v1, GLuint v2, GLuint pv)
{
fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
grDrawLine(&fxMesa->gWin[v1],&fxMesa->gWin[v2]);
}
static void fxLineSmoothTwoSide(GLcontext *ctx, GLuint v1, GLuint v2, GLuint pv)
{
fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
struct vertex_buffer *VB=ctx->VB;
GOURAUD(v1);
GOURAUD(v2);
grDrawLine(&fxMesa->gWin[v1],&fxMesa->gWin[v2]);
}
static void fxLineFlat(GLcontext *ctx, GLuint v1, GLuint v2, GLuint pv)
{
fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
GLubyte *Color=ctx->VB->Color[pv];
grConstantColorValue(FXCOLOR(Color[0], Color[1], Color[2], Color[3]));
grDrawLine(&fxMesa->gWin[v1],&fxMesa->gWin[v2]);
}
/************************************************************************/
static void fxLineSmoothFrontBack(GLcontext *ctx, GLuint v1,
GLuint v2, GLuint pv)
{
fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
if(ctx->Color.ColorMask)
grColorMask(FXTRUE,FXFALSE);
else
grColorMask(FXFALSE,FXFALSE);
grDepthMask(FXFALSE);
grRenderBuffer(GR_BUFFER_BACKBUFFER);
grDrawLine(&fxMesa->gWin[v1],&fxMesa->gWin[v2]);
if(ctx->Color.ColorMask)
grColorMask(FXTRUE,fxMesa->haveAlphaBuffer ? FXTRUE : FXFALSE);
else
grColorMask(FXFALSE,FXFALSE);
if(ctx->Depth.Mask)
grDepthMask(FXTRUE);
grRenderBuffer(GR_BUFFER_FRONTBUFFER);
grDrawLine(&fxMesa->gWin[v1],&fxMesa->gWin[v2]);
}
static void fxLineSmoothTwoSideFrontBack(GLcontext *ctx, GLuint v1,
GLuint v2, GLuint pv)
{
fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
struct vertex_buffer *VB=ctx->VB;
GOURAUD(v1);
GOURAUD(v2);
if(ctx->Color.ColorMask)
grColorMask(FXTRUE,FXFALSE);
else
grColorMask(FXFALSE,FXFALSE);
grDepthMask(FXFALSE);
grRenderBuffer(GR_BUFFER_BACKBUFFER);
grDrawLine(&fxMesa->gWin[v1],&fxMesa->gWin[v2]);
if(ctx->Color.ColorMask)
grColorMask(FXTRUE,fxMesa->haveAlphaBuffer ? FXTRUE : FXFALSE);
else
grColorMask(FXFALSE,FXFALSE);
if(ctx->Depth.Mask)
grDepthMask(FXTRUE);
grRenderBuffer(GR_BUFFER_FRONTBUFFER);
grDrawLine(&fxMesa->gWin[v1],&fxMesa->gWin[v2]);
}
static void fxLineFlatFrontBack(GLcontext *ctx, GLuint v1,
GLuint v2, GLuint pv)
{
fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
GLubyte *Color=ctx->VB->Color[pv];
grConstantColorValue(FXCOLOR(Color[0], Color[1], Color[2], Color[3]));
if(ctx->Color.ColorMask)
grColorMask(FXTRUE,FXFALSE);
else
grColorMask(FXFALSE,FXFALSE);
grDepthMask(FXFALSE);
grRenderBuffer(GR_BUFFER_BACKBUFFER);
grDrawLine(&fxMesa->gWin[v1],&fxMesa->gWin[v2]);
if(ctx->Color.ColorMask)
grColorMask(FXTRUE,fxMesa->haveAlphaBuffer ? FXTRUE : FXFALSE);
else
grColorMask(FXFALSE,FXFALSE);
if(ctx->Depth.Mask)
grDepthMask(FXTRUE);
grRenderBuffer(GR_BUFFER_FRONTBUFFER);
grDrawLine(&fxMesa->gWin[v1],&fxMesa->gWin[v2]);
}
/************************************************************************/
static void fxAALineSmooth(GLcontext *ctx, GLuint v1, GLuint v2, GLuint pv)
{
fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
grAADrawLine(&fxMesa->gWin[v1],&fxMesa->gWin[v2]);
}
static void fxAALineSmoothTwoSide(GLcontext *ctx, GLuint v1, GLuint v2, GLuint pv)
{
fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
struct vertex_buffer *VB=ctx->VB;
GOURAUD(v1);
GOURAUD(v2);
grAADrawLine(&fxMesa->gWin[v1],&fxMesa->gWin[v2]);
}
static void fxAALineFlat(GLcontext *ctx, GLuint v1, GLuint v2, GLuint pv)
{
fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
GLubyte *Color=ctx->VB->Color[pv];
grConstantColorValue(FXCOLOR(Color[0],Color[1],
Color[2],Color[3]));
fxMesa->gWin[v1].a=fxMesa->gWin[v2].a=(float)Color[3];
grAADrawLine(&fxMesa->gWin[v1],&fxMesa->gWin[v2]);
}
/************************************************************************/
line_func fxDDChooseLineFunction(GLcontext *ctx)
{
if((ctx->Line.Width!=1.0f) ||
(ctx->Line.StippleFlag))
return NULL;
if(ctx->Line.SmoothFlag) {
if(ctx->Light.ShadeModel==GL_SMOOTH) {
if(ctx->Light.Model.TwoSide)
return fxAALineSmoothTwoSide;
return fxAALineSmooth;
}
return fxAALineFlat;
}
if(ctx->RasterMask & FRONT_AND_BACK_BIT) {
if(ctx->Light.ShadeModel==GL_SMOOTH) {
if(ctx->Light.Model.TwoSide)
return fxLineSmoothTwoSideFrontBack;
return fxLineSmoothFrontBack;
}
return fxLineFlatFrontBack;
}
if(ctx->Light.ShadeModel==GL_SMOOTH) {
if(ctx->Light.Model.TwoSide)
return fxLineSmoothTwoSide;
return fxLineSmooth;
}
return fxLineFlat;
}
#else
/*
* Need this to provide at least one external definition.
*/
int gl_fx_dummy_function_lines(void)
{
return 0;
}
#endif /* FX */