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/**************************************************************************
*
* Copyright 2007 Tungsten Graphics, 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 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 TUNGSTEN GRAPHICS AND/OR ITS 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.
*
**************************************************************************/
#include "pipe/p_util.h"
#include "pipe/p_shader_tokens.h"
#include "pipe/draw/draw_context.h"
#include "pipe/draw/draw_vertex.h"
#include "cell_context.h"
#include "cell_batch.h"
#include "cell_state.h"
#include "cell_state_emit.h"
static int
find_vs_output(const struct pipe_shader_state *vs,
uint semantic_name,
uint semantic_index)
{
uint i;
for (i = 0; i < vs->num_outputs; i++) {
if (vs->output_semantic_name[i] == semantic_name &&
vs->output_semantic_index[i] == semantic_index)
return i;
}
return -1;
}
/**
* Determine how to map vertex program outputs to fragment program inputs.
* Basically, this will be used when computing the triangle interpolation
* coefficients from the post-transform vertex attributes.
*/
static void
calculate_vertex_layout( struct cell_context *cell )
{
const struct pipe_shader_state *vs = &cell->vs->shader;
const struct pipe_shader_state *fs = &cell->fs->shader;
const enum interp_mode colorInterp
= cell->rasterizer->flatshade ? INTERP_CONSTANT : INTERP_LINEAR;
struct vertex_info *vinfo = &cell->vertex_info;
uint i;
int src;
#if 0
if (cell->vbuf) {
/* if using the post-transform vertex buffer, tell draw_vbuf to
* simply emit the whole post-xform vertex as-is:
*/
struct vertex_info *vinfo_vbuf = &cell->vertex_info_vbuf;
vinfo_vbuf->num_attribs = 0;
draw_emit_vertex_attr(vinfo_vbuf, EMIT_ALL, INTERP_NONE, 0);
vinfo_vbuf->size = 4 * vs->num_outputs + sizeof(struct vertex_header)/4;
}
#endif
/* reset vinfo */
vinfo->num_attribs = 0;
/* we always want to emit vertex pos */
src = find_vs_output(vs, TGSI_SEMANTIC_POSITION, 0);
assert(src >= 0);
draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_POS, src);
/*
* Loop over fragment shader inputs, searching for the matching output
* from the vertex shader.
*/
for (i = 0; i < fs->num_inputs; i++) {
switch (fs->input_semantic_name[i]) {
case TGSI_SEMANTIC_POSITION:
/* already done above */
break;
case TGSI_SEMANTIC_COLOR:
src = find_vs_output(vs, TGSI_SEMANTIC_COLOR,
fs->input_semantic_index[i]);
assert(src >= 0);
draw_emit_vertex_attr(vinfo, EMIT_4F, colorInterp, src);
break;
case TGSI_SEMANTIC_FOG:
src = find_vs_output(vs, TGSI_SEMANTIC_FOG, 0);
#if 1
if (src < 0) /* XXX temp hack, try demos/fogcoord.c with this */
src = 0;
#endif
assert(src >= 0);
draw_emit_vertex_attr(vinfo, EMIT_1F, INTERP_PERSPECTIVE, src);
break;
case TGSI_SEMANTIC_GENERIC:
/* this includes texcoords and varying vars */
src = find_vs_output(vs, TGSI_SEMANTIC_GENERIC,
fs->input_semantic_index[i]);
assert(src >= 0);
draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, src);
break;
default:
assert(0);
}
}
draw_compute_vertex_size(vinfo);
/* XXX only signal this if format really changes */
cell->dirty |= CELL_NEW_VERTEX_INFO;
}
#if 0
/**
* Recompute cliprect from scissor bounds, scissor enable and surface size.
*/
static void
compute_cliprect(struct cell_context *sp)
{
unsigned surfWidth, surfHeight;
if (sp->framebuffer.num_cbufs > 0) {
surfWidth = sp->framebuffer.cbufs[0]->width;
surfHeight = sp->framebuffer.cbufs[0]->height;
}
else {
/* no surface? */
surfWidth = sp->scissor.maxx;
surfHeight = sp->scissor.maxy;
}
if (sp->rasterizer->scissor) {
/* clip to scissor rect */
sp->cliprect.minx = MAX2(sp->scissor.minx, 0);
sp->cliprect.miny = MAX2(sp->scissor.miny, 0);
sp->cliprect.maxx = MIN2(sp->scissor.maxx, surfWidth);
sp->cliprect.maxy = MIN2(sp->scissor.maxy, surfHeight);
}
else {
/* clip to surface bounds */
sp->cliprect.minx = 0;
sp->cliprect.miny = 0;
sp->cliprect.maxx = surfWidth;
sp->cliprect.maxy = surfHeight;
}
}
#endif
void cell_update_derived( struct cell_context *cell )
{
if (cell->dirty & (CELL_NEW_RASTERIZER |
CELL_NEW_FS |
CELL_NEW_VS))
calculate_vertex_layout( cell );
#if 0
if (cell->dirty & (CELL_NEW_SCISSOR |
CELL_NEW_DEPTH_STENCIL_ALPHA |
CELL_NEW_FRAMEBUFFER))
compute_cliprect(cell);
#endif
cell_emit_state(cell);
cell->dirty = 0;
}
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