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cull_tmp.h
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2000-01-07
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/* $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