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/* $XFree86$ */
/**************************************************************************
Copyright 1999, 2000 ATI Technologies Inc. and Precision Insight, Inc.,
Cedar Park, Texas.
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
on the rights to use, copy, modify, merge, publish, distribute, sub
license, 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 (including the next
paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL
ATI, PRECISION INSIGHT AND/OR THEIR SUPPLIERS 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:
* Kevin E. Martin <kevin@precisioninsight.com>
*
*/
#if !defined(TAG) || !defined(IND)
this is an error
#endif
/* Draw a single triangle. Note that the device-dependent vertex data
might need to be changed based on the render state. */
static void TAG(triangle)(GLcontext *ctx,
GLuint e0, GLuint e1, GLuint e2,
GLuint pv)
{
r128ContextPtr r128ctx = R128_CONTEXT(ctx);
struct vertex_buffer *VB = ctx->VB;
r128VertexPtr r128verts = R128_DRIVER_DATA(VB)->verts;
const r128_vertex *v0 = &r128verts[e0].v;
const r128_vertex *v1 = &r128verts[e1].v;
const r128_vertex *v2 = &r128verts[e2].v;
#if (IND & R128_OFFSET_BIT)
GLfloat offset;
#endif
#if (IND & (R128_FLAT_BIT | R128_TWOSIDE_BIT))
int c0 = *(int *)&r128verts[pv].v.dif_argb;
int c1 = c0;
int c2 = c0;
#endif
#if (IND & R128_OFFSET_BIT)
switch (ctx->Visual->DepthBits) {
case 16: offset = ctx->Polygon.OffsetUnits / 65536.0; break;
case 24: offset = ctx->Polygon.OffsetUnits / 16777216.0; break;
case 32: offset = ctx->Polygon.OffsetUnits / 4294967296.0; break;
default: offset = ctx->Polygon.OffsetUnits / 65536.0; break;
}
#endif
#if (IND & (R128_TWOSIDE_BIT | R128_OFFSET_BIT))
{
GLfloat ex = v0->x - v2->x;
GLfloat ey = v0->y - v2->y;
GLfloat fx = v1->x - v2->x;
GLfloat fy = v1->y - v2->y;
GLfloat c = ex*fy - ey*fx;
#if (IND & R128_TWOSIDE_BIT)
{
GLuint facing = (c > 0.0) ^ ctx->Polygon.FrontBit;
GLubyte (*vbcolor)[4] = VB->Color[facing]->data;
if (IND & R128_FLAT_BIT) {
R128_COLOR((char *)&c0, vbcolor[pv]);
c2 = c1 = c0;
} else {
R128_COLOR((char *)&c0, vbcolor[e0]);
R128_COLOR((char *)&c1, vbcolor[e1]);
R128_COLOR((char *)&c2, vbcolor[e2]);
}
}
#endif
#if (IND & R128_OFFSET_BIT)
{
if (c * c > 1e-16) {
GLfloat factor = ctx->Polygon.OffsetFactor;
GLfloat ez = v0->z - v2->z;
GLfloat fz = v1->z - v2->z;
GLfloat a = ey*fz - ez*fy;
GLfloat b = ez*fx - ex*fz;
GLfloat ic = 1.0 / c;
GLfloat ac = a * ic;
GLfloat bc = b * ic;
if (ac < 0.0f) ac = -ac;
if (bc < 0.0f) bc = -bc;
offset += MAX2(ac, bc) * factor;
}
}
#endif
}
#endif
{
r128_vertex *vbptr;
R128CCE_ALLOC_VB_SPACE(r128ctx, vbptr, 3);
vbptr[0] = *v0;
#if (IND & (R128_FLAT_BIT|R128_TWOSIDE_BIT))
*((int *)(&vbptr[0].dif_argb)) = c0;
#endif
#if (IND & R128_OFFSET_BIT)
vbptr[0].z = v0->z + offset;
#endif
vbptr[1] = *v1;
#if (IND & (R128_FLAT_BIT|R128_TWOSIDE_BIT))
*((int *)(&vbptr[1].dif_argb)) = c1;
#endif
#if (IND & R128_OFFSET_BIT)
vbptr[1].z = v1->z + offset;
#endif
vbptr[2] = *v2;
#if (IND & (R128_FLAT_BIT|R128_TWOSIDE_BIT))
*((int *)(&vbptr[2].dif_argb)) = c2;
#endif
#if (IND & R128_OFFSET_BIT)
vbptr[2].z = v2->z + offset;
#endif
}
}
static void TAG(quad)(GLcontext *ctx,
GLuint v0, GLuint v1, GLuint v2, GLuint v3,
GLuint pv)
{
TAG(triangle)(ctx, v0, v1, v3, pv);
TAG(triangle)(ctx, v1, v2, v3, pv);
}
/* Draw a single line. Note that the device-dependent vertex data might
need to be changed based on the render state. */
static void TAG(line)(GLcontext *ctx,
GLuint v0, GLuint v1,
GLuint pv)
{
r128ContextPtr r128ctx = R128_CONTEXT(ctx);
r128VertexPtr r128verts = R128_DRIVER_DATA(ctx->VB)->verts;
float width = ctx->Line.Width;
if (IND & (R128_TWOSIDE_BIT|R128_FLAT_BIT)) {
r128Vertex tmp0 = r128verts[v0];
r128Vertex tmp1 = r128verts[v1];
if (IND & R128_TWOSIDE_BIT) {
GLubyte (*vbcolor)[4] = ctx->VB->ColorPtr->data;
if (IND & R128_FLAT_BIT) {
R128_COLOR((char *)&tmp0.v.dif_argb, vbcolor[pv]);
*(int *)&tmp1.v.dif_argb = *(int *)&tmp0.v.dif_argb;
} else {
R128_COLOR((char *)&tmp0.v.dif_argb, vbcolor[v0]);
R128_COLOR((char *)&tmp1.v.dif_argb, vbcolor[v1]);
}
} else {
*(int *)&tmp0.v.dif_argb = *(int *)&r128verts[pv].v.dif_argb;
*(int *)&tmp1.v.dif_argb = *(int *)&r128verts[pv].v.dif_argb;
}
r128DrawLineVB( r128ctx, &tmp0.v, &tmp1.v, width );
}
else
r128DrawLineVB( r128ctx, &r128verts[v0].v, &r128verts[v1].v, width );
}
/* Draw a set of points. Note that the device-dependent vertex data
might need to be changed based on the render state. */
static void TAG(points)(GLcontext *ctx,
GLuint first, GLuint last)
{
r128ContextPtr r128ctx = R128_CONTEXT(ctx);
struct vertex_buffer *VB = ctx->VB;
r128VertexPtr r128verts = R128_DRIVER_DATA(VB)->verts;
GLfloat size = ctx->Point.Size * 0.5;
int i;
for(i = first; i <= last; i++) {
if(VB->ClipMask[i] == 0) {
if (IND & R128_TWOSIDE_BIT) {
GLubyte (*vbcolor)[4] = VB->ColorPtr->data;
r128Vertex tmp0 = r128verts[i];
R128_COLOR((char *)&tmp0.v.dif_argb, vbcolor[i]);
r128DrawPointVB( r128ctx, &tmp0.v, size );
} else
r128DrawPointVB( r128ctx, &r128verts[i].v, size );
}
}
}
/* Initialize the table of primitives to render. */
static void TAG(init)(void)
{
tri_tab[IND] = TAG(triangle);
quad_tab[IND] = TAG(quad);
line_tab[IND] = TAG(line);
points_tab[IND] = TAG(points);
}
#undef IND
#undef TAG
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