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/*
* Mesa 3-D graphics library
* Version: 6.1
*
* Copyright (C) 1999-2004 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.
*
* Authors:
* Keith Whitwell <keith@tungstengraphics.com>
*/
static void TAG(triangle)(GLcontext *ctx, GLuint e0, GLuint e1, GLuint e2 )
{
struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
SWvertex *v[3];
GLfloat z[3];
GLfloat offset;
GLenum mode = GL_FILL;
GLuint facing = 0;
GLchan saved_color[3][4];
GLchan saved_spec[3][4];
GLfloat saved_index[3];
v[0] = &verts[e0];
v[1] = &verts[e1];
v[2] = &verts[e2];
if (IND & (SS_TWOSIDE_BIT | SS_OFFSET_BIT | SS_UNFILLED_BIT))
{
GLfloat ex = v[0]->win[0] - v[2]->win[0];
GLfloat ey = v[0]->win[1] - v[2]->win[1];
GLfloat fx = v[1]->win[0] - v[2]->win[0];
GLfloat fy = v[1]->win[1] - v[2]->win[1];
GLfloat cc = ex*fy - ey*fx;
if (IND & (SS_TWOSIDE_BIT | SS_UNFILLED_BIT))
{
facing = (cc < 0.0) ^ ctx->Polygon._FrontBit;
ctx->_Facing = facing;
if (IND & SS_UNFILLED_BIT)
mode = facing ? ctx->Polygon.BackMode : ctx->Polygon.FrontMode;
if (facing == 1) {
if (IND & SS_TWOSIDE_BIT) {
if (IND & SS_RGBA_BIT) {
if (VB->ColorPtr[1]) {
GLfloat (*vbcolor)[4] = VB->ColorPtr[1]->data;
COPY_CHAN4(saved_color[0], v[0]->color);
COPY_CHAN4(saved_color[1], v[1]->color);
COPY_CHAN4(saved_color[2], v[2]->color);
if (VB->ColorPtr[1]->stride) {
SS_COLOR(v[0]->color, vbcolor[e0]);
SS_COLOR(v[1]->color, vbcolor[e1]);
SS_COLOR(v[2]->color, vbcolor[e2]);
}
else {
SS_COLOR(v[0]->color, vbcolor[0]);
SS_COLOR(v[1]->color, vbcolor[0]);
SS_COLOR(v[2]->color, vbcolor[0]);
}
}
if (VB->SecondaryColorPtr[1]) {
GLfloat (*vbspec)[4] = VB->SecondaryColorPtr[1]->data;
COPY_CHAN4(saved_spec[0], v[0]->specular);
COPY_CHAN4(saved_spec[1], v[1]->specular);
COPY_CHAN4(saved_spec[2], v[2]->specular);
if (VB->SecondaryColorPtr[1]->stride) {
SS_SPEC(v[0]->specular, vbspec[e0]);
SS_SPEC(v[1]->specular, vbspec[e1]);
SS_SPEC(v[2]->specular, vbspec[e2]);
}
else {
SS_SPEC(v[0]->specular, vbspec[0]);
SS_SPEC(v[1]->specular, vbspec[0]);
SS_SPEC(v[2]->specular, vbspec[0]);
}
}
} else {
GLfloat *vbindex = (GLfloat *)VB->IndexPtr[1]->data;
saved_index[0] = v[0]->index;
saved_index[1] = v[1]->index;
saved_index[2] = v[2]->index;
SS_IND(v[0]->index, (GLuint) vbindex[e0]);
SS_IND(v[1]->index, (GLuint) vbindex[e1]);
SS_IND(v[2]->index, (GLuint) vbindex[e2]);
}
}
}
}
if (IND & SS_OFFSET_BIT)
{
offset = ctx->Polygon.OffsetUnits * ctx->DrawBuffer->_MRD;
z[0] = v[0]->win[2];
z[1] = v[1]->win[2];
z[2] = v[2]->win[2];
if (cc * cc > 1e-16) {
const GLfloat ez = z[0] - z[2];
const GLfloat fz = z[1] - z[2];
const GLfloat oneOverArea = 1.0F / cc;
const GLfloat dzdx = FABSF((ey * fz - ez * fy) * oneOverArea);
const GLfloat dzdy = FABSF((ez * fx - ex * fz) * oneOverArea);
offset += MAX2(dzdx, dzdy) * ctx->Polygon.OffsetFactor;
/* Unfortunately, we need to clamp to prevent negative Zs below.
* Technically, we should do the clamping per-fragment.
*/
offset = MAX2(offset, -v[0]->win[2]);
offset = MAX2(offset, -v[1]->win[2]);
offset = MAX2(offset, -v[2]->win[2]);
}
}
}
if (mode == GL_POINT) {
if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetPoint) {
v[0]->win[2] += offset;
v[1]->win[2] += offset;
v[2]->win[2] += offset;
}
_swsetup_render_point_tri( ctx, e0, e1, e2, facing );
} else if (mode == GL_LINE) {
if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetLine) {
v[0]->win[2] += offset;
v[1]->win[2] += offset;
v[2]->win[2] += offset;
}
_swsetup_render_line_tri( ctx, e0, e1, e2, facing );
} else {
if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetFill) {
v[0]->win[2] += offset;
v[1]->win[2] += offset;
v[2]->win[2] += offset;
}
_swrast_Triangle( ctx, v[0], v[1], v[2] );
}
if (IND & SS_OFFSET_BIT) {
v[0]->win[2] = z[0];
v[1]->win[2] = z[1];
v[2]->win[2] = z[2];
}
if (IND & SS_TWOSIDE_BIT) {
if (facing == 1) {
if (IND & SS_RGBA_BIT) {
if (VB->ColorPtr[1]) {
COPY_CHAN4(v[0]->color, saved_color[0]);
COPY_CHAN4(v[1]->color, saved_color[1]);
COPY_CHAN4(v[2]->color, saved_color[2]);
}
if (VB->SecondaryColorPtr[1]) {
COPY_CHAN4(v[0]->specular, saved_spec[0]);
COPY_CHAN4(v[1]->specular, saved_spec[1]);
COPY_CHAN4(v[2]->specular, saved_spec[2]);
}
} else {
v[0]->index = saved_index[0];
v[1]->index = saved_index[1];
v[2]->index = saved_index[2];
}
}
}
}
/* Need to fixup edgeflags when decomposing to triangles:
*/
static void TAG(quadfunc)( GLcontext *ctx, GLuint v0,
GLuint v1, GLuint v2, GLuint v3 )
{
if (IND & SS_UNFILLED_BIT) {
struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
GLubyte ef1 = VB->EdgeFlag[v1];
GLubyte ef3 = VB->EdgeFlag[v3];
VB->EdgeFlag[v1] = 0;
TAG(triangle)( ctx, v0, v1, v3 );
VB->EdgeFlag[v1] = ef1;
VB->EdgeFlag[v3] = 0;
TAG(triangle)( ctx, v1, v2, v3 );
VB->EdgeFlag[v3] = ef3;
} else {
TAG(triangle)( ctx, v0, v1, v3 );
TAG(triangle)( ctx, v1, v2, v3 );
}
}
static void TAG(init)( void )
{
tri_tab[IND] = TAG(triangle);
quad_tab[IND] = TAG(quadfunc);
}
#undef IND
#undef TAG
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