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/*
* 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.
*/
#define DO_CULL 0x1
#define DO_OFFSET 0x2
#define DO_LIGHT_TWOSIDE 0x4
#define DO_UNFILLED 0x8
#define HAVE_CULL_MASK 0x10
static void TAG(render_triangle)( GLcontext *ctx,
GLuint v0, GLuint v1, GLuint v2, GLuint pv )
{
struct vertex_buffer *VB = ctx->VB;
#if ((IND & NEED_FACING) && !(IND & HAVE_CULL_MASK)) || (IND & DO_OFFSET)
GLfloat (*win)[4] = VB->Win.data;
GLfloat ex = win[v1][0] - win[v0][0];
GLfloat ey = win[v1][1] - win[v0][1];
GLfloat fx = win[v2][0] - win[v0][0];
GLfloat fy = win[v2][1] - win[v0][1];
GLfloat c = ex*fy-ey*fx;
#endif
#if (IND & NEED_FACING)
#if (IND & HAVE_CULL_MASK)
GLuint facing = ((VB->CullMask[pv]&PRIM_FACE_REAR)?1:0);
#else
GLuint facing = (c<0.0F) ^ (ctx->Polygon.FrontFace==GL_CW);
#endif
#endif
#if (IND & DO_CULL)
if ((facing+1) & ctx->Polygon.CullBits)
return;
#endif
#if (IND & DO_OFFSET)
{
/* finish computing plane equation of polygon, compute offset */
GLfloat fz = win[v2][2] - win[v0][2];
GLfloat ez = win[v1][2] - win[v0][2];
GLfloat a = ey*fz-ez*fy;
GLfloat b = ez*fx-ex*fz;
offset_polygon( ctx, a, b, c );
}
#endif
#if (IND & DO_LIGHT_TWOSIDE)
VB->Specular = VB->Spec[facing];
VB->ColorPtr = VB->Color[facing];
VB->IndexPtr = VB->Index[facing];
#endif
#if (IND & DO_UNFILLED)
{
GLuint vlist[3];
vlist[0] = v0;
vlist[1] = v1;
vlist[2] = v2;
unfilled_polygon( ctx, 3, vlist, pv, facing );
}
#else
ctx->Driver.TriangleFunc( ctx, v0, v1, v2, pv );
#endif
}
/* Implements quad rendering when direct_triangles is false.
*
* Need to implement cull check ?
*/
static void render_quad( GLcontext *ctx, GLuint v0, GLuint v1,
GLuint v2, GLuint v3, GLuint pv )
{
struct vertex_buffer *VB = ctx->VB;
GLuint facing = ((VB->CullMask[pv]&PRIM_FACE_REAR)?1:0);
if (ctx->IndirectTriangles & DD_TRI_OFFSET) {
GLfloat (*win)[4] = VB->Win.data;
GLfloat ez = win[v2][2] - win[v0][2];
GLfloat fz = win[v3][2] - win[v1][2];
GLfloat ex = win[v2][0] - win[v0][0];
GLfloat ey = win[v2][1] - win[v0][1];
GLfloat fx = win[v3][0] - win[v1][0];
GLfloat fy = win[v3][1] - win[v1][1];
GLfloat a = ey*fz-ez*fy;
GLfloat b = ez*fx-ex*fz;
GLfloat c = ex*fy-ey*fx;
offset_polygon( ctx, a, b, c );
}
if (ctx->IndirectTriangles & DD_TRI_LIGHT_TWOSIDE) {
VB->Specular = VB->Spec[facing];
VB->ColorPtr = VB->Color[facing];
VB->IndexPtr = VB->Index[facing];
}
/* Render the quad! */
if (ctx->Polygon.Unfilled) {
GLuint vlist[4];
vlist[0] = v0;
vlist[1] = v1;
vlist[2] = v2;
vlist[3] = v3;
unfilled_polygon( ctx, 4, vlist, pv, facing );
}
else {
(*ctx->Driver.QuadFunc)( ctx, v0, v1, v2, v3, pv );
}
}
void unfilled_triangle( GLcontext *ctx, GLuint v0, GLuint v1, GLuint v2,
GLuint pv )
{
GLuint vlist[4];
vlist[0] = v0;
vlist[1] = v1;
vlist[2] = v2;
unfilled_polygon( ctx, 3, vlist, pv, facing );
}
void unfilled_quad( GLcontext *ctx, GLuint v0, GLuint v1, GLuint v2,
GLuint v3, GLuint pv )
{
GLuint vlist[4];
vlist[0] = v0;
vlist[1] = v1;
vlist[2] = v2;
vlist[3] = v3;
unfilled_polygon( ctx, 4, vlist, pv, facing );
}
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