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/**************************************************************************
*
* Copyright 2003 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 "pipe/draw/draw_private.h"
#include "sp_context.h"
#include "sp_state.h"
/**
* Search vertex program's outputs to find a match for the given
* semantic name/index. Return the index of the output slot.
*
* Return 0 if not found. This will cause the fragment program to use
* vertex attrib 0 (position) in the cases where the fragment program
* attempts to use a missing vertex program output. This is an undefined
* condition that users shouldn't hit anyway.
*/
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 0;
}
/**
* Mark the current vertex layout as "invalid".
* We'll validate the vertex layout later, when we start to actually
* render a point or line or tri.
*/
static void
invalidate_vertex_layout(struct softpipe_context *softpipe)
{
softpipe->vertex_info.num_attribs = 0;
}
/**
* The vertex info describes how to convert the post-transformed vertices
* (simple float[][4]) used by the 'draw' module into vertices for
* rasterization.
*
* This function validates the vertex layout and returns a pointer to a
* vertex_info object.
*/
struct vertex_info *
softpipe_get_vertex_info(struct softpipe_context *softpipe)
{
struct vertex_info *vinfo = &softpipe->vertex_info;
if (vinfo->num_attribs == 0) {
/* compute vertex layout now */
const struct pipe_shader_state *vs = &softpipe->vs->shader;
const struct pipe_shader_state *fs = &softpipe->fs->shader;
const enum interp_mode colorInterp
= softpipe->rasterizer->flatshade ? INTERP_CONSTANT : INTERP_LINEAR;
uint i;
if (softpipe->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 = &softpipe->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;
}
/*
* Loop over fragment shader inputs, searching for the matching output
* from the vertex shader.
*/
vinfo->num_attribs = 0;
for (i = 0; i < fs->num_inputs; i++) {
int src;
switch (fs->input_semantic_name[i]) {
case TGSI_SEMANTIC_POSITION:
src = find_vs_output(vs, TGSI_SEMANTIC_POSITION, 0);
draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_POS, src);
break;
case TGSI_SEMANTIC_COLOR:
src = find_vs_output(vs, TGSI_SEMANTIC_COLOR,
fs->input_semantic_index[i]);
draw_emit_vertex_attr(vinfo, EMIT_4F, colorInterp, src);
break;
case TGSI_SEMANTIC_FOG:
src = find_vs_output(vs, TGSI_SEMANTIC_FOG, 0);
draw_emit_vertex_attr(vinfo, EMIT_4F, 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]);
draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, src);
break;
default:
assert(0);
}
}
softpipe->psize_slot = find_vs_output(vs, TGSI_SEMANTIC_PSIZE, 0);
if (softpipe->psize_slot > 0) {
draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_CONSTANT,
softpipe->psize_slot);
}
draw_compute_vertex_size(vinfo);
}
return vinfo;
}
/**
* Called from vbuf module.
*
* Note that there's actually two different vertex layouts in softpipe.
*
* The normal one is computed in softpipe_get_vertex_info() above and is
* used by the point/line/tri "setup" code.
*
* The other one (this one) is only used by the vbuf module (which is
* not normally used by default but used in testing). For the vbuf module,
* we basically want to pass-through the draw module's vertex layout as-is.
* When the softpipe vbuf code begins drawing, the normal vertex layout
* will come into play again.
*/
struct vertex_info *
softpipe_get_vbuf_vertex_info(struct softpipe_context *softpipe)
{
(void) softpipe_get_vertex_info(softpipe);
return &softpipe->vertex_info_vbuf;
}
/**
* Recompute cliprect from scissor bounds, scissor enable and surface size.
*/
static void
compute_cliprect(struct softpipe_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;
}
}
/* Hopefully this will remain quite simple, otherwise need to pull in
* something like the state tracker mechanism.
*/
void softpipe_update_derived( struct softpipe_context *softpipe )
{
if (softpipe->dirty & (SP_NEW_RASTERIZER |
SP_NEW_FS |
SP_NEW_VS))
invalidate_vertex_layout( softpipe );
if (softpipe->dirty & (SP_NEW_SCISSOR |
SP_NEW_DEPTH_STENCIL_ALPHA |
SP_NEW_FRAMEBUFFER))
compute_cliprect(softpipe);
if (softpipe->dirty & (SP_NEW_BLEND |
SP_NEW_DEPTH_STENCIL_ALPHA |
SP_NEW_FRAMEBUFFER |
SP_NEW_RASTERIZER |
SP_NEW_FS |
SP_NEW_QUERY))
sp_build_quad_pipeline(softpipe);
softpipe->dirty = 0;
}
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