home *** CD-ROM | disk | FTP | other *** search
- /* $Id: cull_tmp.h,v 1.1.1.1 1999/08/19 00:55:41 jtg Exp $ */
-
- /*
- * Mesa 3-D graphics library
- * Version: 3.1
- *
- * Copyright (C) 1999 Brian Paul All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
- /*
- * New (3.1) transformation code written by Keith Whitwell.
- */
-
-
- static GLuint TAG(gl_cull_triangles)( struct vertex_buffer *VB,
- GLuint start,
- GLuint count,
- GLuint parity,
- CONST GLfloat (*proj)[4])
- {
- const GLcontext *ctx = VB->ctx;
- const GLubyte face_bit = ctx->Polygon.FrontBit;
- const GLubyte cull_faces = ctx->Polygon.CullBits;
- GLubyte *cullmask = VB->CullMask;
- GLint i,cullcount = 0;
- GLint last = count - 3;
-
- (void) parity;
- for (i=start; i <= last ; i+=3 ) {
- CULL_TRI(DO_CLIP, DO_AREA, i, i+1, i+2, face_bit, 3);
- }
-
- if (i != count)
- cullcount += count - i;
-
- return cullcount;
- }
-
-
-
-
-
-
- static GLuint TAG(gl_cull_triangle_fan)( struct vertex_buffer *VB,
- GLuint start,
- GLuint count,
- GLuint parity,
- CONST GLfloat (*proj)[4])
- {
- const GLcontext *ctx = VB->ctx;
- const GLubyte face_bit = ctx->Polygon.FrontBit;
- const GLubyte cull_faces = ctx->Polygon.CullBits;
- GLubyte *cullmask = VB->CullMask;
- GLint cullcount = 0;
- GLint i;
- GLint last = count - 3;
- GLint nr = 3;
-
- (void) parity;
- for (i=start; i <= last ; i++, nr = 1) {
- CULL_TRI(DO_CLIP, DO_AREA, start, i+1, i+2, face_bit, nr);
- }
-
- if (i != last + 1)
- cullcount += count - i;
-
- return cullcount;
- }
-
-
-
- static GLuint TAG(gl_cull_triangle_strip)( struct vertex_buffer *VB,
- GLuint start,
- GLuint count,
- GLuint parity,
- CONST GLfloat (*proj)[4])
- {
- const GLcontext *ctx = VB->ctx;
- const GLubyte face_bit = ctx->Polygon.FrontBit;
- const GLubyte cull_faces = ctx->Polygon.CullBits;
- GLubyte *cullmask = VB->CullMask;
- GLint i;
- GLint cullcount = 0;
- GLint last = count - 3;
- GLint nr = 2;
-
- parity ^= face_bit;
-
- for (i = start; i <= last ; i++, parity ^= 1, nr = 1 ) {
- CULL_TRI(DO_CLIP, DO_AREA, i, i+1, i+2, parity, nr);
- }
-
- if (i != last + 1)
- cullcount += count - i;
-
- return cullcount;
- }
-
-
-
-
-
- static GLuint TAG(gl_cull_quads)( struct vertex_buffer *VB,
- GLuint start,
- GLuint count,
- GLuint parity,
- CONST GLfloat (*proj)[4])
- {
- const GLcontext *ctx = VB->ctx;
- const GLubyte face_bit = ctx->Polygon.FrontBit;
- const GLubyte cull_faces = ctx->Polygon.CullBits;
- GLubyte *cullmask = VB->CullMask;
- GLint i,cullcount = 0;
- GLint last = count - 4;
-
- (void) parity;
-
- for (i = start; i <= last ; i += 4) {
- CULL_QUAD(DO_CLIP, DO_AREA, i, i+1, i+2, i+3, 4);
- }
-
- if (i != count)
- cullcount += count - i;
-
- return cullcount;
- }
-
-
- static GLuint TAG(gl_cull_quad_strip)( struct vertex_buffer *VB,
- GLuint start,
- GLuint count,
- GLuint parity,
- CONST GLfloat (*proj)[4])
- {
- const GLcontext *ctx = VB->ctx;
- const GLubyte face_bit = ctx->Polygon.FrontBit;
- const GLubyte cull_faces = ctx->Polygon.CullBits;
- GLubyte *cullmask = VB->CullMask;
- GLint i,cullcount = 0;
- GLint last = count - 4;
- GLint nr = 4;
-
- (void) parity;
-
- for (i = start ; i <= last ; i += 2, nr = 2) {
- CULL_QUAD(DO_CLIP, DO_AREA, i, i+1, i+3, i+2, nr);
- }
-
- if (i != last + 2)
- cullcount += count - i;
-
- return cullcount;
- }
-
-
-
-
- #undef DO_CLIP
- #undef DO_AREA
- #undef TAG
-