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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 "main/glheader.h"
#include "main/macros.h"
#include "main/enums.h"
#include "vf/vf.h"
#include "pipe/draw/draw_context.h"
#include "sp_context.h"
#include "sp_state.h"
#define EMIT_ATTR( VF_ATTR, FRAG_ATTR, INTERP ) \
do { \
slot_to_vf_attr[softpipe->nr_attrs] = VF_ATTR; \
softpipe->vf_attr_to_slot[VF_ATTR] = softpipe->nr_attrs; \
softpipe->fp_attr_to_slot[FRAG_ATTR] = softpipe->nr_attrs; \
softpipe->interp[softpipe->nr_attrs] = INTERP; \
softpipe->nr_attrs++; \
attr_mask |= (1 << (VF_ATTR)); \
} while (0)
static const GLuint frag_to_vf[FRAG_ATTRIB_MAX] =
{
VF_ATTRIB_POS,
VF_ATTRIB_COLOR0,
VF_ATTRIB_COLOR1,
VF_ATTRIB_FOG,
VF_ATTRIB_TEX0,
VF_ATTRIB_TEX1,
VF_ATTRIB_TEX2,
VF_ATTRIB_TEX3,
VF_ATTRIB_TEX4,
VF_ATTRIB_TEX5,
VF_ATTRIB_TEX6,
VF_ATTRIB_TEX7,
VF_ATTRIB_VAR0,
VF_ATTRIB_VAR1,
VF_ATTRIB_VAR2,
VF_ATTRIB_VAR3,
VF_ATTRIB_VAR4,
VF_ATTRIB_VAR5,
VF_ATTRIB_VAR6,
VF_ATTRIB_VAR7,
};
/**
* Determine which post-transform / pre-rasterization vertex attributes
* we need.
* Derived from: fs, setup states.
*/
static void calculate_vertex_layout( struct softpipe_context *softpipe )
{
const GLbitfield inputsRead = softpipe->fs.inputs_read;
GLuint slot_to_vf_attr[VF_ATTRIB_MAX];
GLbitfield attr_mask = 0x0;
GLuint i;
/* Need Z if depth test is enabled or the fragment program uses the
* fragment position (XYZW).
*/
if (softpipe->depth_test.enabled ||
(inputsRead & FRAG_ATTRIB_WPOS))
softpipe->need_z = GL_TRUE;
else
softpipe->need_z = GL_FALSE;
/* Need W if we do any perspective-corrected interpolation or the
* fragment program uses the fragment position.
*/
if (inputsRead & FRAG_ATTRIB_WPOS)
softpipe->need_w = GL_TRUE;
else
softpipe->need_w = GL_FALSE;
softpipe->nr_attrs = 0;
memset(slot_to_vf_attr, 0, sizeof(slot_to_vf_attr));
memset(softpipe->fp_attr_to_slot, 0, sizeof(softpipe->fp_attr_to_slot));
memset(softpipe->vf_attr_to_slot, 0, sizeof(softpipe->vf_attr_to_slot));
/* TODO - Figure out if we need to do perspective divide, etc.
*/
EMIT_ATTR(VF_ATTRIB_POS, FRAG_ATTRIB_WPOS, INTERP_LINEAR);
/* Pull in the rest of the attributes. They are all in float4
* format. Future optimizations could be to keep some attributes
* as fixed point or ubyte format.
*/
for (i = 1; i < FRAG_ATTRIB_TEX0; i++) {
if (inputsRead & (1 << i)) {
assert(i < sizeof(frag_to_vf) / sizeof(frag_to_vf[0]));
if (softpipe->setup.flatshade
&& (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1))
EMIT_ATTR(frag_to_vf[i], i, INTERP_CONSTANT);
else
EMIT_ATTR(frag_to_vf[i], i, INTERP_LINEAR);
}
}
for (i = FRAG_ATTRIB_TEX0; i < FRAG_ATTRIB_MAX; i++) {
if (inputsRead & (1 << i)) {
assert(i < sizeof(frag_to_vf) / sizeof(frag_to_vf[0]));
EMIT_ATTR(frag_to_vf[i], i, INTERP_PERSPECTIVE);
softpipe->need_w = GL_TRUE;
}
}
softpipe->nr_frag_attrs = softpipe->nr_attrs;
/* Additional attributes required for setup: Just twosided
* lighting. Edgeflag is dealt with specially by setting bits in
* the vertex header.
*/
if (softpipe->setup.light_twoside) {
if (inputsRead & FRAG_BIT_COL0) {
EMIT_ATTR(VF_ATTRIB_BFC0, FRAG_ATTRIB_MAX, 0); /* XXX: mark as discarded after setup */
}
if (inputsRead & FRAG_BIT_COL1) {
EMIT_ATTR(VF_ATTRIB_BFC1, FRAG_ATTRIB_MAX, 0); /* XXX: discard after setup */
}
}
/* If the attributes have changed, tell the draw module (which in turn
* tells the vf module) about the new vertex layout.
*/
if (attr_mask != softpipe->attr_mask) {
softpipe->attr_mask = attr_mask;
draw_set_vertex_attributes( softpipe->draw,
slot_to_vf_attr,
softpipe->nr_attrs );
}
}
/**
* Recompute cliprect from scissor bounds, scissor enable and surface size.
*/
static void
compute_cliprect(struct softpipe_context *sp)
{
GLint 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->setup.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_SETUP | SP_NEW_FS))
calculate_vertex_layout( softpipe );
if (softpipe->dirty & (SP_NEW_SCISSOR |
SP_NEW_STENCIL |
SP_NEW_FRAMEBUFFER))
compute_cliprect(softpipe);
if (softpipe->dirty & (SP_NEW_BLEND |
SP_NEW_DEPTH_TEST |
SP_NEW_ALPHA_TEST |
SP_NEW_FRAMEBUFFER |
SP_NEW_STENCIL |
SP_NEW_SETUP |
SP_NEW_FS))
sp_build_quad_pipeline(softpipe);
softpipe->dirty = 0;
}
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