| 1 | /* $Id: quads.c,v 1.2 2000-05-23 20:40:51 jeroen Exp $ */
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| 2 |
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| 3 | /*
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| 4 | * Mesa 3-D graphics library
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| 5 | * Version: 3.3
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| 6 | *
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| 7 | * Copyright (C) 1999 Brian Paul All Rights Reserved.
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| 8 | *
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| 9 | * Permission is hereby granted, free of charge, to any person obtaining a
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| 10 | * copy of this software and associated documentation files (the "Software"),
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| 11 | * to deal in the Software without restriction, including without limitation
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| 12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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| 13 | * and/or sell copies of the Software, and to permit persons to whom the
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| 14 | * Software is furnished to do so, subject to the following conditions:
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| 15 | *
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| 16 | * The above copyright notice and this permission notice shall be included
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| 17 | * in all copies or substantial portions of the Software.
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| 18 | *
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| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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| 20 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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| 22 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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| 23 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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| 24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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| 25 | */
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| 26 | /* $XFree86: xc/lib/GL/mesa/src/quads.c,v 1.2 1999/04/04 00:20:30 dawes Exp $ */
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| 27 |
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| 28 |
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| 29 |
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| 30 |
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| 31 |
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| 32 | /*
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| 33 | * Quadrilateral rendering functions.
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| 34 | */
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| 35 |
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| 36 |
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| 37 | #ifdef PC_HEADER
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| 38 | #include "all.h"
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| 39 | #else
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| 40 | #include "glheader.h"
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| 41 | #include "types.h"
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| 42 | #include "quads.h"
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| 43 | #endif
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| 44 |
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| 45 |
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| 46 |
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| 47 | /*
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| 48 | * At this time there is no quadrilateral optimization. Just call the
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| 49 | * triangle function twice.
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| 50 | * v0, v1, v2, v3 in CCW order = front facing.
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| 51 | */
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| 52 | static void basic_quad( GLcontext *ctx,
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| 53 | GLuint v0, GLuint v1, GLuint v2, GLuint v3, GLuint pv )
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| 54 | {
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| 55 | /* (*ctx->Driver.TriangleFunc)( ctx, v0, v1, v3, pv ); */
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| 56 | /* (*ctx->Driver.TriangleFunc)( ctx, v1, v2, v3, pv ); */
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| 57 | (*ctx->Driver.TriangleFunc)( ctx, v0, v1, v2, pv );
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| 58 | (*ctx->Driver.TriangleFunc)( ctx, v0, v2, v3, pv );
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| 59 | }
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| 60 |
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| 61 |
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| 62 |
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| 63 | /*
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| 64 | * Draw nothing (NULL raster mode)
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| 65 | */
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| 66 | static void null_quad( GLcontext *ctx,
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| 67 | GLuint v0, GLuint v1, GLuint v2, GLuint v3, GLuint pv )
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| 68 | {
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| 69 | (void) ctx;
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| 70 | (void) v0;
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| 71 | (void) v1;
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| 72 | (void) v2;
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| 73 | (void) v3;
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| 74 | (void) pv;
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| 75 | }
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| 76 |
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| 77 |
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| 78 |
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| 79 | void gl_set_quad_function( GLcontext *ctx )
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| 80 | {
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| 81 | if (ctx->RenderMode==GL_RENDER) {
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| 82 | if (ctx->NoRaster) {
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| 83 | ctx->Driver.QuadFunc = null_quad;
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| 84 | }
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| 85 | else if (ctx->Driver.QuadFunc) {
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| 86 | /* Device driver will draw quads. */
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| 87 | return;
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| 88 | }
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| 89 | else
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| 90 | ctx->Driver.QuadFunc = basic_quad;
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| 91 |
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| 92 | }
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| 93 | else {
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| 94 | /* if in feedback or selection mode we can fall back to triangle code */
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| 95 | ctx->Driver.QuadFunc = basic_quad;
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| 96 | }
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| 97 | }
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| 98 |
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| 99 |
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