/**
* Prepare to render a vertex buffer.
* Called via tnl->Driver.Render.Start.
*/
static void
_swsetup_RenderStart( struct gl_context *ctx )
{
SScontext *swsetup = SWSETUP_CONTEXT(ctx);
TNLcontext *tnl = TNL_CONTEXT(ctx);
struct vertex_buffer *VB = &tnl->vb;
if (swsetup->NewState & _SWSETUP_NEW_RENDERINDEX) {
_swsetup_choose_trifuncs(ctx);
}
if (swsetup->NewState & _NEW_PROGRAM) {
swsetup->last_index_bitset = 0;
}
swsetup->NewState = 0;
/* This will change if drawing unfilled tris */
_swrast_SetFacing(ctx, 0);
_swrast_render_start(ctx);
/* Important */
VB->AttribPtr[VERT_ATTRIB_POS] = VB->NdcPtr;
setup_vertex_format(ctx);
}
/*
* Render a triangle respecting cull and shade model.
*/
static void _swsetup_render_tri(struct gl_context *ctx,
GLuint e0,
GLuint e1,
GLuint e2,
GLuint facing,
swsetup_edge_render_prim_tri render)
{
SScontext *swsetup = SWSETUP_CONTEXT(ctx);
struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
GLubyte *ef = VB->EdgeFlag;
SWvertex *verts = swsetup->verts;
SWvertex *v0 = &verts[e0];
SWvertex *v1 = &verts[e1];
SWvertex *v2 = &verts[e2];
/* cull testing */
if (ctx->Polygon.CullFlag) {
if (facing == 1 && ctx->Polygon.CullFaceMode != GL_FRONT)
return;
if (facing == 0 && ctx->Polygon.CullFaceMode != GL_BACK)
return;
}
_swrast_SetFacing(ctx, facing);
if (ctx->Light.ShadeModel == GL_FLAT) {
GLchan c[2][4];
GLfloat s[2][4];
/* save colors/indexes for v0, v1 vertices */
COPY_CHAN4(c[0], v0->color);
COPY_CHAN4(c[1], v1->color);
COPY_4V(s[0], v0->attrib[FRAG_ATTRIB_COL1]);
COPY_4V(s[1], v1->attrib[FRAG_ATTRIB_COL1]);
/* copy v2 color/indexes to v0, v1 indexes */
COPY_CHAN4(v0->color, v2->color);
COPY_CHAN4(v1->color, v2->color);
COPY_4V(v0->attrib[FRAG_ATTRIB_COL1], v2->attrib[FRAG_ATTRIB_COL1]);
COPY_4V(v1->attrib[FRAG_ATTRIB_COL1], v2->attrib[FRAG_ATTRIB_COL1]);
render(ctx, ef, e0, e1, e2, v0, v1, v2);
COPY_CHAN4(v0->color, c[0]);
COPY_CHAN4(v1->color, c[1]);
COPY_4V(v0->attrib[FRAG_ATTRIB_COL1], s[0]);
COPY_4V(v1->attrib[FRAG_ATTRIB_COL1], s[1]);
}
else {
render(ctx, ef, e0, e1, e2, v0, v1, v2);
}
}