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794 lines
24 KiB
C
794 lines
24 KiB
C
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/* $Id: triangle.c,v 1.31 1998/02/03 23:46:00 brianp Exp $ */
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/*
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* Mesa 3-D graphics library
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* Version: 2.4
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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: triangle.c,v $
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* Revision 1.31 1998/02/03 23:46:00 brianp
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* fixed a few problems with condition expressions for Amiga StormC compiler
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*
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* Revision 1.30 1997/08/27 01:20:05 brianp
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* moved texture completeness test out one level (Karl Anders Oygard)
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*
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* Revision 1.29 1997/07/24 01:26:05 brianp
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* changed precompiled header symbol from PCH to PC_HEADER
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*
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* Revision 1.28 1997/07/21 22:18:10 brianp
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* fixed bug in compute_lambda() thanks to Magnus Lundin
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*
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* Revision 1.27 1997/06/23 00:40:03 brianp
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* added a DEFARRAY/UNDEFARRAY for the Mac
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*
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* Revision 1.26 1997/06/20 02:51:38 brianp
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* changed color components from GLfixed to GLubyte
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*
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* Revision 1.25 1997/06/03 01:38:22 brianp
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* fixed divide by zero problem in feedback function (William Mitchell)
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*
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* Revision 1.24 1997/05/28 03:26:49 brianp
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* added precompiled header (PCH) support
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*
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* Revision 1.23 1997/05/17 03:40:55 brianp
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* refined textured triangle selection code (Mats Lofkvist)
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*
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* Revision 1.22 1997/05/03 00:51:02 brianp
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* removed calls to gl_texturing_enabled()
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*
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* Revision 1.21 1997/04/14 21:38:15 brianp
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* fixed a typo (dtdx instead of dudx) in lambda_textured_triangle()
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*
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* Revision 1.20 1997/04/14 02:00:39 brianp
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* #include "texstate.h" instead of "texture.h"
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*
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* Revision 1.19 1997/04/12 12:27:16 brianp
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* replaced ctx->TriangleFunc with ctx->Driver.TriangleFunc
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*
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* Revision 1.18 1997/04/02 03:12:06 brianp
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* replaced ctx->IdentityTexMat with ctx->TextureMatrixType
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*
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* Revision 1.17 1997/03/13 03:05:31 brianp
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* removed unused shift variable in feedback_triangle()
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*
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* Revision 1.16 1997/03/08 02:04:27 brianp
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* better implementation of feedback function
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*
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* Revision 1.15 1997/03/04 18:54:13 brianp
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* renamed mipmap_textured_triangle() to lambda_textured_triangle()
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* better comments about lambda and mipmapping
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*
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* Revision 1.14 1997/02/20 23:47:35 brianp
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* triangle feedback colors were wrong when using smooth shading
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*
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* Revision 1.13 1997/02/19 10:24:26 brianp
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* use a GLdouble instead of a GLfloat for wwvvInv (perspective correction)
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*
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* Revision 1.12 1997/02/09 19:53:43 brianp
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* now use TEXTURE_xD enable constants
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*
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* Revision 1.11 1997/02/09 18:51:02 brianp
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* added GL_EXT_texture3D support
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*
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* Revision 1.10 1997/01/16 03:36:43 brianp
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* added #include "texture.h"
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*
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* Revision 1.9 1997/01/09 19:50:49 brianp
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* now call gl_texturing_enabled()
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*
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* Revision 1.8 1996/12/20 20:23:30 brianp
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* the test for using general_textured_triangle() was wrong
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*
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* Revision 1.7 1996/12/12 22:37:30 brianp
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* projective textures didn't work right
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*
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* Revision 1.6 1996/11/08 02:21:21 brianp
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* added null drawing function for GL_NO_RASTER
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*
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* Revision 1.4 1996/09/27 01:30:37 brianp
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* removed unneeded INTERP_ALPHA from flat_rgba_triangle()
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*
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* Revision 1.3 1996/09/15 14:19:16 brianp
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* now use GLframebuffer and GLvisual
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*
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* Revision 1.2 1996/09/15 01:48:58 brianp
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* removed #define NULL 0
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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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/*
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* Triangle rasterizers
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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 <math.h>
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#include <stdio.h>
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#include "depth.h"
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#include "feedback.h"
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#include "macros.h"
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#include "span.h"
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#include "texstate.h"
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#include "triangle.h"
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#include "types.h"
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#include "vb.h"
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#endif
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/*
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* Put triangle in feedback buffer.
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*/
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static void feedback_triangle( GLcontext *ctx,
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GLuint v0, GLuint v1, GLuint v2, GLuint pv )
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{
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struct vertex_buffer *VB = ctx->VB;
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GLfloat color[4];
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GLuint i;
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GLfloat invRedScale = ctx->Visual->InvRedScale;
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GLfloat invGreenScale = ctx->Visual->InvGreenScale;
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GLfloat invBlueScale = ctx->Visual->InvBlueScale;
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GLfloat invAlphaScale = ctx->Visual->InvAlphaScale;
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FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN );
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FEEDBACK_TOKEN( ctx, (GLfloat) 3 ); /* three vertices */
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if (ctx->Light.ShadeModel==GL_FLAT) {
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/* flat shading - same color for each vertex */
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color[0] = (GLfloat) VB->Color[pv][0] * invRedScale;
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color[1] = (GLfloat) VB->Color[pv][1] * invGreenScale;
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color[2] = (GLfloat) VB->Color[pv][2] * invBlueScale;
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color[3] = (GLfloat) VB->Color[pv][3] * invAlphaScale;
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}
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for (i=0;i<3;i++) {
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GLfloat x, y, z, w;
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GLfloat tc[4];
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GLuint v;
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GLfloat invq;
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if (i==0) v = v0;
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else if (i==1) v = v1;
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else v = v2;
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x = VB->Win[v][0];
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y = VB->Win[v][1];
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z = VB->Win[v][2] / DEPTH_SCALE;
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w = VB->Clip[v][3];
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if (ctx->Light.ShadeModel==GL_SMOOTH) {
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/* smooth shading - different color for each vertex */
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color[0] = VB->Color[v][0] * invRedScale;
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color[1] = VB->Color[v][1] * invGreenScale;
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color[2] = VB->Color[v][2] * invBlueScale;
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color[3] = VB->Color[v][3] * invAlphaScale;
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}
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invq = (VB->TexCoord[v][3]==0.0) ? 1.0 : (1.0F / VB->TexCoord[v][3]);
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tc[0] = VB->TexCoord[v][0] * invq;
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tc[1] = VB->TexCoord[v][1] * invq;
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tc[2] = VB->TexCoord[v][2] * invq;
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tc[3] = VB->TexCoord[v][3];
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gl_feedback_vertex( ctx, x, y, z, w, color, (GLfloat) VB->Index[v], tc );
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}
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}
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/*
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* Put triangle in selection buffer.
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*/
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static void select_triangle( GLcontext *ctx,
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GLuint v0, GLuint v1, GLuint v2, GLuint pv )
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{
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struct vertex_buffer *VB = ctx->VB;
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gl_update_hitflag( ctx, VB->Win[v0][2] / DEPTH_SCALE );
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gl_update_hitflag( ctx, VB->Win[v1][2] / DEPTH_SCALE );
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gl_update_hitflag( ctx, VB->Win[v2][2] / DEPTH_SCALE );
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}
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/*
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* Render a flat-shaded color index triangle.
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*/
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static void flat_ci_triangle( GLcontext *ctx,
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GLuint v0, GLuint v1, GLuint v2, GLuint pv )
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{
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#define INTERP_Z 1
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#define SETUP_CODE \
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GLuint index = VB->Index[pv]; \
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if (!VB->MonoColor) { \
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/* set the color index */ \
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(*ctx->Driver.Index)( ctx, index ); \
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}
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#define INNER_LOOP( LEFT, RIGHT, Y ) \
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{ \
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GLint i, n = RIGHT-LEFT; \
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GLdepth zspan[MAX_WIDTH]; \
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if (n>0) { \
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for (i=0;i<n;i++) { \
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zspan[i] = ffz; \
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ffz += fdzdx; \
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} \
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gl_write_monoindex_span( ctx, n, LEFT, Y, \
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zspan, index, GL_POLYGON ); \
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} \
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}
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#include "tritemp.h"
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}
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/*
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* Render a smooth-shaded color index triangle.
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*/
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static void smooth_ci_triangle( GLcontext *ctx,
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GLuint v0, GLuint v1, GLuint v2, GLuint pv )
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{
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#define INTERP_Z 1
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#define INTERP_INDEX 1
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#define INNER_LOOP( LEFT, RIGHT, Y ) \
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{ \
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GLint i, n = RIGHT-LEFT; \
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GLdepth zspan[MAX_WIDTH]; \
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GLuint index[MAX_WIDTH]; \
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if (n>0) { \
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for (i=0;i<n;i++) { \
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zspan[i] = ffz; \
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index[i] = FixedToInt(ffi); \
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ffz += fdzdx; \
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ffi += fdidx; \
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} \
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gl_write_index_span( ctx, n, LEFT, Y, zspan, \
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index, GL_POLYGON ); \
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} \
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}
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#include "tritemp.h"
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}
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/*
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* Render a flat-shaded RGBA triangle.
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*/
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static void flat_rgba_triangle( GLcontext *ctx,
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GLuint v0, GLuint v1, GLuint v2, GLuint pv )
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{
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#define INTERP_Z 1
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#define SETUP_CODE \
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if (!VB->MonoColor) { \
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/* set the color */ \
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GLubyte r = VB->Color[pv][0]; \
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GLubyte g = VB->Color[pv][1]; \
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GLubyte b = VB->Color[pv][2]; \
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GLubyte a = VB->Color[pv][3]; \
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(*ctx->Driver.Color)( ctx, r, g, b, a ); \
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}
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#define INNER_LOOP( LEFT, RIGHT, Y ) \
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{ \
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GLint i, n = RIGHT-LEFT; \
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GLdepth zspan[MAX_WIDTH]; \
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if (n>0) { \
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for (i=0;i<n;i++) { \
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zspan[i] = ffz; \
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ffz += fdzdx; \
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} \
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gl_write_monocolor_span( ctx, n, LEFT, Y, zspan, \
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VB->Color[pv][0], VB->Color[pv][1],\
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VB->Color[pv][2], VB->Color[pv][3],\
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GL_POLYGON ); \
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} \
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}
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#include "tritemp.h"
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}
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/*
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* Render a smooth-shaded RGBA triangle.
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*/
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static void smooth_rgba_triangle( GLcontext *ctx,
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GLuint v0, GLuint v1, GLuint v2, GLuint pv )
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{
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#define INTERP_Z 1
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#define INTERP_RGB 1
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#define INTERP_ALPHA 1
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#define INNER_LOOP( LEFT, RIGHT, Y ) \
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{ \
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GLint i, n = RIGHT-LEFT; \
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GLdepth zspan[MAX_WIDTH]; \
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GLubyte red[MAX_WIDTH], green[MAX_WIDTH]; \
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GLubyte blue[MAX_WIDTH], alpha[MAX_WIDTH]; \
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if (n>0) { \
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for (i=0;i<n;i++) { \
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zspan[i] = ffz; \
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red[i] = FixedToInt(ffr); \
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green[i] = FixedToInt(ffg); \
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blue[i] = FixedToInt(ffb); \
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alpha[i] = FixedToInt(ffa); \
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ffz += fdzdx; \
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ffr += fdrdx; \
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ffg += fdgdx; \
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ffb += fdbdx; \
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ffa += fdadx; \
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} \
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gl_write_color_span( ctx, n, LEFT, Y, zspan, \
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red, green, blue, alpha, \
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GL_POLYGON ); \
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} \
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}
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#include "tritemp.h"
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}
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/*
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* Render an RGB, GL_DECAL, textured triangle.
|
||
|
|
* Interpolate S,T only w/out mipmapping or perspective correction.
|
||
|
|
*/
|
||
|
|
static void simple_textured_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
|
||
|
|
GLuint v2, GLuint pv )
|
||
|
|
{
|
||
|
|
#define INTERP_ST 1
|
||
|
|
#define S_SCALE twidth
|
||
|
|
#define T_SCALE theight
|
||
|
|
#define SETUP_CODE \
|
||
|
|
GLfloat twidth = (GLfloat) ctx->Texture.Current2D->Image[0]->Width; \
|
||
|
|
GLfloat theight = (GLfloat) ctx->Texture.Current2D->Image[0]->Height;\
|
||
|
|
GLint twidth_log2 = ctx->Texture.Current2D->Image[0]->WidthLog2; \
|
||
|
|
GLubyte *texture = ctx->Texture.Current2D->Image[0]->Data; \
|
||
|
|
GLint smask = ctx->Texture.Current2D->Image[0]->Width - 1; \
|
||
|
|
GLint tmask = ctx->Texture.Current2D->Image[0]->Height - 1;
|
||
|
|
|
||
|
|
#define INNER_LOOP( LEFT, RIGHT, Y ) \
|
||
|
|
{ \
|
||
|
|
GLint i, n = RIGHT-LEFT; \
|
||
|
|
GLubyte red[MAX_WIDTH], green[MAX_WIDTH]; \
|
||
|
|
GLubyte blue[MAX_WIDTH], alpha[MAX_WIDTH]; \
|
||
|
|
if (n>0) { \
|
||
|
|
for (i=0;i<n;i++) { \
|
||
|
|
GLint s = FixedToInt(ffs) & smask; \
|
||
|
|
GLint t = FixedToInt(fft) & tmask; \
|
||
|
|
GLint pos = (t << twidth_log2) + s; \
|
||
|
|
pos = pos + pos + pos; /* multiply by 3 */ \
|
||
|
|
red[i] = texture[pos]; \
|
||
|
|
green[i] = texture[pos+1]; \
|
||
|
|
blue[i] = texture[pos+2]; \
|
||
|
|
alpha[i] = 255; \
|
||
|
|
ffs += fdsdx; \
|
||
|
|
fft += fdtdx; \
|
||
|
|
} \
|
||
|
|
(*ctx->Driver.WriteColorSpan)( ctx, n, LEFT, Y, \
|
||
|
|
red, green, blue, alpha, NULL ); \
|
||
|
|
} \
|
||
|
|
}
|
||
|
|
|
||
|
|
#include "tritemp.h"
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Render an RGB, GL_DECAL, textured triangle.
|
||
|
|
* Interpolate S,T, GL_LESS depth test, w/out mipmapping or
|
||
|
|
* perspective correction.
|
||
|
|
*/
|
||
|
|
static void simple_z_textured_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
|
||
|
|
GLuint v2, GLuint pv )
|
||
|
|
{
|
||
|
|
#define INTERP_Z 1
|
||
|
|
#define INTERP_ST 1
|
||
|
|
#define S_SCALE twidth
|
||
|
|
#define T_SCALE theight
|
||
|
|
#define SETUP_CODE \
|
||
|
|
GLfloat twidth = (GLfloat) ctx->Texture.Current2D->Image[0]->Width; \
|
||
|
|
GLfloat theight = (GLfloat) ctx->Texture.Current2D->Image[0]->Height;\
|
||
|
|
GLint twidth_log2 = ctx->Texture.Current2D->Image[0]->WidthLog2; \
|
||
|
|
GLubyte *texture = ctx->Texture.Current2D->Image[0]->Data; \
|
||
|
|
GLint smask = ctx->Texture.Current2D->Image[0]->Width - 1; \
|
||
|
|
GLint tmask = ctx->Texture.Current2D->Image[0]->Height - 1;
|
||
|
|
|
||
|
|
#define INNER_LOOP( LEFT, RIGHT, Y ) \
|
||
|
|
{ \
|
||
|
|
GLint i, n = RIGHT-LEFT; \
|
||
|
|
GLubyte red[MAX_WIDTH], green[MAX_WIDTH]; \
|
||
|
|
GLubyte blue[MAX_WIDTH], alpha[MAX_WIDTH]; \
|
||
|
|
GLubyte mask[MAX_WIDTH]; \
|
||
|
|
if (n>0) { \
|
||
|
|
for (i=0;i<n;i++) { \
|
||
|
|
GLdepth z = ffz; \
|
||
|
|
if (z < zRow[i]) { \
|
||
|
|
GLint s = FixedToInt(ffs) & smask; \
|
||
|
|
GLint t = FixedToInt(fft) & tmask; \
|
||
|
|
GLint pos = (t << twidth_log2) + s; \
|
||
|
|
pos = pos + pos + pos; /* multiply by 3 */\
|
||
|
|
red[i] = texture[pos]; \
|
||
|
|
green[i] = texture[pos+1]; \
|
||
|
|
blue[i] = texture[pos+2]; \
|
||
|
|
alpha[i] = 255; \
|
||
|
|
zRow[i] = z; \
|
||
|
|
mask[i] = 1; \
|
||
|
|
} \
|
||
|
|
else { \
|
||
|
|
mask[i] = 0; \
|
||
|
|
} \
|
||
|
|
ffz += fdzdx; \
|
||
|
|
ffs += fdsdx; \
|
||
|
|
fft += fdtdx; \
|
||
|
|
} \
|
||
|
|
(*ctx->Driver.WriteColorSpan)( ctx, n, LEFT, Y, \
|
||
|
|
red, green, blue, alpha, mask ); \
|
||
|
|
} \
|
||
|
|
}
|
||
|
|
|
||
|
|
#include "tritemp.h"
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Render a smooth-shaded, textured, RGBA triangle.
|
||
|
|
* Interpolate S,T,U with perspective correction, w/out mipmapping.
|
||
|
|
* Note: we use texture coordinates S,T,U,V instead of S,T,R,Q because
|
||
|
|
* R is already used for red.
|
||
|
|
*/
|
||
|
|
static void general_textured_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
|
||
|
|
GLuint v2, GLuint pv )
|
||
|
|
{
|
||
|
|
#define INTERP_Z 1
|
||
|
|
#define INTERP_RGB 1
|
||
|
|
#define INTERP_ALPHA 1
|
||
|
|
#define INTERP_STW 1
|
||
|
|
#define INTERP_UV 1
|
||
|
|
#define SETUP_CODE \
|
||
|
|
GLboolean flat_shade = (ctx->Light.ShadeModel==GL_FLAT); \
|
||
|
|
GLint r, g, b, a; \
|
||
|
|
if (flat_shade) { \
|
||
|
|
r = VB->Color[pv][0]; \
|
||
|
|
g = VB->Color[pv][1]; \
|
||
|
|
b = VB->Color[pv][2]; \
|
||
|
|
a = VB->Color[pv][3]; \
|
||
|
|
}
|
||
|
|
#define INNER_LOOP( LEFT, RIGHT, Y ) \
|
||
|
|
{ \
|
||
|
|
GLint i, n = RIGHT-LEFT; \
|
||
|
|
GLdepth zspan[MAX_WIDTH]; \
|
||
|
|
GLubyte red[MAX_WIDTH], green[MAX_WIDTH]; \
|
||
|
|
GLubyte blue[MAX_WIDTH], alpha[MAX_WIDTH]; \
|
||
|
|
GLfloat s[MAX_WIDTH], t[MAX_WIDTH], u[MAX_WIDTH]; \
|
||
|
|
if (n>0) { \
|
||
|
|
if (flat_shade) { \
|
||
|
|
for (i=0;i<n;i++) { \
|
||
|
|
GLdouble wwvvInv = 1.0 / (ww*vv); \
|
||
|
|
zspan[i] = ffz; \
|
||
|
|
red[i] = r; \
|
||
|
|
green[i] = g; \
|
||
|
|
blue[i] = b; \
|
||
|
|
alpha[i] = a; \
|
||
|
|
s[i] = ss*wwvvInv; \
|
||
|
|
t[i] = tt*wwvvInv; \
|
||
|
|
u[i] = uu*wwvvInv; \
|
||
|
|
ffz += fdzdx; \
|
||
|
|
ss += dsdx; \
|
||
|
|
tt += dtdx; \
|
||
|
|
uu += dudx; \
|
||
|
|
vv += dvdx; \
|
||
|
|
ww += dwdx; \
|
||
|
|
} \
|
||
|
|
} \
|
||
|
|
else { \
|
||
|
|
for (i=0;i<n;i++) { \
|
||
|
|
GLdouble wwvvInv = 1.0 / (ww*vv); \
|
||
|
|
zspan[i] = ffz; \
|
||
|
|
red[i] = FixedToInt(ffr); \
|
||
|
|
green[i] = FixedToInt(ffg); \
|
||
|
|
blue[i] = FixedToInt(ffb); \
|
||
|
|
alpha[i] = FixedToInt(ffa); \
|
||
|
|
s[i] = ss*wwvvInv; \
|
||
|
|
t[i] = tt*wwvvInv; \
|
||
|
|
u[i] = uu*wwvvInv; \
|
||
|
|
ffz += fdzdx; \
|
||
|
|
ffr += fdrdx; \
|
||
|
|
ffg += fdgdx; \
|
||
|
|
ffb += fdbdx; \
|
||
|
|
ffa += fdadx; \
|
||
|
|
ss += dsdx; \
|
||
|
|
tt += dtdx; \
|
||
|
|
uu += dudx; \
|
||
|
|
ww += dwdx; \
|
||
|
|
vv += dvdx; \
|
||
|
|
} \
|
||
|
|
} \
|
||
|
|
gl_write_texture_span( ctx, n, LEFT, Y, zspan, \
|
||
|
|
s, t, u, NULL, \
|
||
|
|
red, green, blue, alpha, \
|
||
|
|
GL_POLYGON ); \
|
||
|
|
} \
|
||
|
|
}
|
||
|
|
|
||
|
|
#include "tritemp.h"
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Compute the lambda value (texture level value) for a fragment.
|
||
|
|
*/
|
||
|
|
static GLfloat compute_lambda( GLfloat s, GLfloat t,
|
||
|
|
GLfloat dsdx, GLfloat dsdy,
|
||
|
|
GLfloat dtdx, GLfloat dtdy,
|
||
|
|
GLfloat w, GLfloat dwdx, GLfloat dwdy,
|
||
|
|
GLfloat width, GLfloat height )
|
||
|
|
{
|
||
|
|
/* TODO: this function can probably be optimized a bit */
|
||
|
|
GLfloat invw = 1.0 / w;
|
||
|
|
GLfloat dudx, dudy, dvdx, dvdy;
|
||
|
|
GLfloat r1, r2, rho2;
|
||
|
|
|
||
|
|
dudx = (dsdx - s*dwdx) * invw * width;
|
||
|
|
dudy = (dsdy - s*dwdy) * invw * width;
|
||
|
|
dvdx = (dtdx - t*dwdx) * invw * height;
|
||
|
|
dvdy = (dtdy - t*dwdy) * invw * height;
|
||
|
|
|
||
|
|
r1 = dudx * dudx + dudy * dudy;
|
||
|
|
r2 = dvdx * dvdx + dvdy * dvdy;
|
||
|
|
|
||
|
|
/* rho2 = MAX2(r1,r2); */
|
||
|
|
rho2 = r1 + r2;
|
||
|
|
if (rho2 <= 0.0F) {
|
||
|
|
return 0.0F;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
/* return log base 2 of rho */
|
||
|
|
return log(rho2) * 1.442695 * 0.5; /* 1.442695 = 1/log(2) */
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Render a smooth-shaded, textured, RGBA triangle.
|
||
|
|
* Interpolate S,T,U with perspective correction and compute lambda for
|
||
|
|
* each fragment. Lambda is used to determine whether to use the
|
||
|
|
* minification or magnification filter. If minification and using
|
||
|
|
* mipmaps, lambda is also used to select the texture level of detail.
|
||
|
|
*/
|
||
|
|
static void lambda_textured_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
|
||
|
|
GLuint v2, GLuint pv )
|
||
|
|
{
|
||
|
|
#define INTERP_Z 1
|
||
|
|
#define INTERP_RGB 1
|
||
|
|
#define INTERP_ALPHA 1
|
||
|
|
#define INTERP_STW 1
|
||
|
|
#define INTERP_UV 1
|
||
|
|
|
||
|
|
#define SETUP_CODE \
|
||
|
|
GLboolean flat_shade = (ctx->Light.ShadeModel==GL_FLAT); \
|
||
|
|
GLint r, g, b, a; \
|
||
|
|
GLfloat twidth, theight; \
|
||
|
|
if (ctx->Texture.Enabled & TEXTURE_2D) { \
|
||
|
|
twidth = (GLfloat) ctx->Texture.Current2D->Image[0]->Width; \
|
||
|
|
theight = (GLfloat) ctx->Texture.Current2D->Image[0]->Height; \
|
||
|
|
} \
|
||
|
|
else { \
|
||
|
|
twidth = (GLfloat) ctx->Texture.Current1D->Image[0]->Width; \
|
||
|
|
theight = 1.0; \
|
||
|
|
} \
|
||
|
|
if (flat_shade) { \
|
||
|
|
r = VB->Color[pv][0]; \
|
||
|
|
g = VB->Color[pv][1]; \
|
||
|
|
b = VB->Color[pv][2]; \
|
||
|
|
a = VB->Color[pv][3]; \
|
||
|
|
}
|
||
|
|
|
||
|
|
#define INNER_LOOP( LEFT, RIGHT, Y ) \
|
||
|
|
{ \
|
||
|
|
GLint i, n = RIGHT-LEFT; \
|
||
|
|
GLdepth zspan[MAX_WIDTH]; \
|
||
|
|
GLubyte red[MAX_WIDTH], green[MAX_WIDTH]; \
|
||
|
|
GLubyte blue[MAX_WIDTH], alpha[MAX_WIDTH]; \
|
||
|
|
GLfloat s[MAX_WIDTH], t[MAX_WIDTH], u[MAX_WIDTH]; \
|
||
|
|
DEFARRAY(GLfloat,lambda,MAX_WIDTH); \
|
||
|
|
if (n>0) { \
|
||
|
|
if (flat_shade) { \
|
||
|
|
for (i=0;i<n;i++) { \
|
||
|
|
GLdouble wwvvInv = 1.0 / (ww*vv); \
|
||
|
|
zspan[i] = ffz; \
|
||
|
|
red[i] = r; \
|
||
|
|
green[i] = g; \
|
||
|
|
blue[i] = b; \
|
||
|
|
alpha[i] = a; \
|
||
|
|
s[i] = ss*wwvvInv; \
|
||
|
|
t[i] = tt*wwvvInv; \
|
||
|
|
u[i] = uu*wwvvInv; \
|
||
|
|
lambda[i] = compute_lambda( s[i], t[i], \
|
||
|
|
dsdx, dsdy, \
|
||
|
|
dtdx, dtdy, ww, \
|
||
|
|
dwdx, dwdy, \
|
||
|
|
twidth, theight ); \
|
||
|
|
ffz += fdzdx; \
|
||
|
|
ss += dsdx; \
|
||
|
|
tt += dtdx; \
|
||
|
|
uu += dudx; \
|
||
|
|
vv += dvdx; \
|
||
|
|
ww += dwdx; \
|
||
|
|
} \
|
||
|
|
} \
|
||
|
|
else { \
|
||
|
|
for (i=0;i<n;i++) { \
|
||
|
|
GLdouble wwvvInv = 1.0 / (ww*vv); \
|
||
|
|
zspan[i] = ffz; \
|
||
|
|
red[i] = FixedToInt(ffr); \
|
||
|
|
green[i] = FixedToInt(ffg); \
|
||
|
|
blue[i] = FixedToInt(ffb); \
|
||
|
|
alpha[i] = FixedToInt(ffa); \
|
||
|
|
s[i] = ss*wwvvInv; \
|
||
|
|
t[i] = tt*wwvvInv; \
|
||
|
|
u[i] = uu*wwvvInv; \
|
||
|
|
lambda[i] = compute_lambda( s[i], t[i], \
|
||
|
|
dsdx, dsdy, \
|
||
|
|
dtdx, dtdy, ww, \
|
||
|
|
dwdx, dwdy, \
|
||
|
|
twidth, theight ); \
|
||
|
|
ffz += fdzdx; \
|
||
|
|
ffr += fdrdx; \
|
||
|
|
ffg += fdgdx; \
|
||
|
|
ffb += fdbdx; \
|
||
|
|
ffa += fdadx; \
|
||
|
|
ss += dsdx; \
|
||
|
|
tt += dtdx; \
|
||
|
|
uu += dudx; \
|
||
|
|
vv += dvdx; \
|
||
|
|
ww += dwdx; \
|
||
|
|
} \
|
||
|
|
} \
|
||
|
|
gl_write_texture_span( ctx, n, LEFT, Y, zspan, \
|
||
|
|
s, t, u, lambda, \
|
||
|
|
red, green, blue, alpha, \
|
||
|
|
GL_POLYGON ); \
|
||
|
|
} \
|
||
|
|
UNDEFARRAY(lambda); \
|
||
|
|
}
|
||
|
|
|
||
|
|
#include "tritemp.h"
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Null rasterizer for measuring transformation speed.
|
||
|
|
*/
|
||
|
|
static void null_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
|
||
|
|
GLuint v2, GLuint pv )
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Determine which triangle rendering function to use given the current
|
||
|
|
* rendering context.
|
||
|
|
*/
|
||
|
|
void gl_set_triangle_function( GLcontext *ctx )
|
||
|
|
{
|
||
|
|
GLboolean rgbmode = ctx->Visual->RGBAflag;
|
||
|
|
|
||
|
|
if (ctx->RenderMode==GL_RENDER) {
|
||
|
|
if (ctx->NoRaster) {
|
||
|
|
ctx->Driver.TriangleFunc = null_triangle;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
if (ctx->Driver.TriangleFunc) {
|
||
|
|
/* Device driver will draw triangles. */
|
||
|
|
}
|
||
|
|
else if (ctx->Texture.Enabled
|
||
|
|
&& ctx->Texture.Current
|
||
|
|
&& ctx->Texture.Current->Complete) {
|
||
|
|
if ( (ctx->Texture.Enabled==TEXTURE_2D)
|
||
|
|
&& ctx->Texture.Current2D->MinFilter==GL_NEAREST
|
||
|
|
&& ctx->Texture.Current2D->MagFilter==GL_NEAREST
|
||
|
|
&& ctx->Texture.Current2D->WrapS==GL_REPEAT
|
||
|
|
&& ctx->Texture.Current2D->WrapT==GL_REPEAT
|
||
|
|
&& ctx->Texture.Current2D->Image[0]->Format==GL_RGB
|
||
|
|
&& ctx->Texture.Current2D->Image[0]->Border==0
|
||
|
|
&& (ctx->Texture.EnvMode==GL_DECAL
|
||
|
|
|| ctx->Texture.EnvMode==GL_REPLACE)
|
||
|
|
&& ctx->Hint.PerspectiveCorrection==GL_FASTEST
|
||
|
|
&& ctx->TextureMatrixType==MATRIX_IDENTITY
|
||
|
|
&& ((ctx->RasterMask==DEPTH_BIT
|
||
|
|
&& ctx->Depth.Func==GL_LESS
|
||
|
|
&& ctx->Depth.Mask==GL_TRUE)
|
||
|
|
|| ctx->RasterMask==0)
|
||
|
|
&& ctx->Polygon.StippleFlag==GL_FALSE
|
||
|
|
&& ctx->Visual->EightBitColor) {
|
||
|
|
if (ctx->RasterMask==DEPTH_BIT) {
|
||
|
|
ctx->Driver.TriangleFunc = simple_z_textured_triangle;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
ctx->Driver.TriangleFunc = simple_textured_triangle;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
GLboolean needLambda = GL_TRUE;
|
||
|
|
/* if mag filter == min filter we're not mipmapping */
|
||
|
|
if (ctx->Texture.Enabled & TEXTURE_2D) {
|
||
|
|
if (ctx->Texture.Current2D->MinFilter==
|
||
|
|
ctx->Texture.Current2D->MagFilter) {
|
||
|
|
needLambda = GL_FALSE;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else if (ctx->Texture.Enabled & TEXTURE_1D) {
|
||
|
|
if (ctx->Texture.Current1D->MinFilter==
|
||
|
|
ctx->Texture.Current1D->MagFilter) {
|
||
|
|
needLambda = GL_FALSE;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (needLambda)
|
||
|
|
ctx->Driver.TriangleFunc = lambda_textured_triangle;
|
||
|
|
else
|
||
|
|
ctx->Driver.TriangleFunc = general_textured_triangle;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
if (ctx->Light.ShadeModel==GL_SMOOTH) {
|
||
|
|
/* smooth shaded, no texturing, stippled or some raster ops */
|
||
|
|
if (rgbmode)
|
||
|
|
ctx->Driver.TriangleFunc = smooth_rgba_triangle;
|
||
|
|
else
|
||
|
|
ctx->Driver.TriangleFunc = smooth_ci_triangle;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
/* flat shaded, no texturing, stippled or some raster ops */
|
||
|
|
if (rgbmode)
|
||
|
|
ctx->Driver.TriangleFunc = flat_rgba_triangle;
|
||
|
|
else
|
||
|
|
ctx->Driver.TriangleFunc = flat_ci_triangle;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else if (ctx->RenderMode==GL_FEEDBACK) {
|
||
|
|
ctx->Driver.TriangleFunc = feedback_triangle;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
/* GL_SELECT mode */
|
||
|
|
ctx->Driver.TriangleFunc = select_triangle;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|