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/**************************************************************************
*
* Copyright 2010, VMware Inc.
* 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 VMWARE 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.
*
**************************************************************************/
/*
* Binning code for points
*/
#include "lp_setup_context.h"
#include "util/u_math.h"
#include "util/u_memory.h"
#include "lp_perf.h"
#include "lp_setup_context.h"
#include "lp_rast.h"
#include "lp_state_fs.h"
#include "tgsi/tgsi_scan.h"
#define NUM_CHANNELS 4
struct point_info {
/* x,y deltas */
int dy01, dy12;
int dx01, dx12;
const float (*v0)[4];
};
/**
* Compute a0 for a constant-valued coefficient (GL_FLAT shading).
*/
static void
constant_coef(struct lp_setup_context *setup,
struct lp_rast_triangle *point,
unsigned slot,
const float value,
unsigned i)
{
point->inputs.a0[slot][i] = value;
point->inputs.dadx[slot][i] = 0.0f;
point->inputs.dady[slot][i] = 0.0f;
}
static void
perspective_coef(struct lp_setup_context *setup,
struct lp_rast_triangle *point,
const struct point_info *info,
unsigned slot,
unsigned vert_attr,
unsigned i,
unsigned sprite_coord_origin)
{
if (i == 0) {
float dadx = FIXED_ONE / (float)info->dx12;
float dady = 0.0f;
point->inputs.dadx[slot][i] = dadx;
point->inputs.dady[slot][i] = dady;
point->inputs.a0[slot][i] = (0.5 -
(dadx * ((float)info->v0[0][0] - setup->pixel_offset) +
dady * ((float)info->v0[0][1] - setup->pixel_offset)));
}
else if (i == 1) {
float dadx = 0.0f;
float dady = FIXED_ONE / (float)info->dx12;
if (sprite_coord_origin == PIPE_SPRITE_COORD_LOWER_LEFT) {
dady = -dady;
}
point->inputs.dadx[slot][i] = dadx;
point->inputs.dady[slot][i] = dady;
point->inputs.a0[slot][i] = (0.5 -
(dadx * ((float)info->v0[0][0] - setup->pixel_offset) +
dady * ((float)info->v0[0][1] - setup->pixel_offset)));
}
else if (i == 2) {
point->inputs.a0[slot][i] = 0.0f;
point->inputs.dadx[slot][i] = 0.0f;
point->inputs.dady[slot][i] = 0.0f;
}
else if (i == 3) {
point->inputs.a0[slot][i] = 1.0f;
point->inputs.dadx[slot][i] = 0.0f;
point->inputs.dady[slot][i] = 0.0f;
}
}
/**
* Special coefficient setup for gl_FragCoord.
* X and Y are trivial
* Z and W are copied from position_coef which should have already been computed.
* We could do a bit less work if we'd examine gl_FragCoord's swizzle mask.
*/
static void
setup_point_fragcoord_coef(struct lp_setup_context *setup,
struct lp_rast_triangle *point,
const struct point_info *info,
unsigned slot,
unsigned usage_mask)
{
/*X*/
if (usage_mask & TGSI_WRITEMASK_X) {
point->inputs.a0[slot][0] = 0.0;
point->inputs.dadx[slot][0] = 1.0;
point->inputs.dady[slot][0] = 0.0;
}
/*Y*/
if (usage_mask & TGSI_WRITEMASK_Y) {
point->inputs.a0[slot][1] = 0.0;
point->inputs.dadx[slot][1] = 0.0;
point->inputs.dady[slot][1] = 1.0;
}
/*Z*/
if (usage_mask & TGSI_WRITEMASK_Z) {
constant_coef(setup, point, slot, info->v0[0][2], 2);
}
/*W*/
if (usage_mask & TGSI_WRITEMASK_W) {
constant_coef(setup, point, slot, info->v0[0][3], 3);
}
}
/**
* Compute the point->coef[] array dadx, dady, a0 values.
*/
static void
setup_point_coefficients( struct lp_setup_context *setup,
struct lp_rast_triangle *point,
const struct point_info *info)
{
const struct lp_fragment_shader *shader = setup->fs.current.variant->shader;
unsigned fragcoord_usage_mask = TGSI_WRITEMASK_XYZ;
unsigned slot;
/* setup interpolation for all the remaining attributes:
*/
for (slot = 0; slot < setup->fs.nr_inputs; slot++) {
unsigned vert_attr = setup->fs.input[slot].src_index;
unsigned usage_mask = setup->fs.input[slot].usage_mask;
unsigned i;
switch (setup->fs.input[slot].interp) {
case LP_INTERP_POSITION:
/*
* The generated pixel interpolators will pick up the coeffs from
* slot 0, so all need to ensure that the usage mask is covers all
* usages.
*/
fragcoord_usage_mask |= usage_mask;
break;
case LP_INTERP_LINEAR:
/* Sprite tex coords may use linear interpolation someday */
/* fall-through */
case LP_INTERP_PERSPECTIVE:
/* check if the sprite coord flag is set for this attribute.
* If so, set it up so it up so x any y vary from 0 to 1.
*/
if (shader->info.input_semantic_name[slot] == TGSI_SEMANTIC_GENERIC) {
const int index = shader->info.input_semantic_index[slot];
if (setup->sprite_coord_enable & (1 << index)) {
for (i = 0; i < NUM_CHANNELS; i++)
if (usage_mask & (1 << i))
perspective_coef(setup, point, info, slot+1, vert_attr, i,
setup->sprite_coord_origin);
fragcoord_usage_mask |= TGSI_WRITEMASK_W;
break;
}
}
/* Otherwise fallthrough */
default:
for (i = 0; i < NUM_CHANNELS; i++) {
if (usage_mask & (1 << i))
constant_coef(setup, point, slot+1, info->v0[vert_attr][i], i);
}
}
}
/* The internal position input is in slot zero:
*/
setup_point_fragcoord_coef(setup, point, info, 0,
fragcoord_usage_mask);
}
static INLINE int
subpixel_snap(float a)
{
return util_iround(FIXED_ONE * a);
}
static boolean
try_setup_point( struct lp_setup_context *setup,
const float (*v0)[4] )
{
/* x/y positions in fixed point */
const int sizeAttr = setup->psize;
const float size
= (setup->point_size_per_vertex && sizeAttr > 0) ? v0[sizeAttr][0]
: setup->point_size;
/* Point size as fixed point integer, remove rounding errors
* and gives minimum width for very small points
*/
int fixed_width = MAX2(FIXED_ONE,
(subpixel_snap(size) + FIXED_ONE/2 - 1) & ~(FIXED_ONE-1));
const int x0 = subpixel_snap(v0[0][0] - setup->pixel_offset) - fixed_width/2;
const int y0 = subpixel_snap(v0[0][1] - setup->pixel_offset) - fixed_width/2;
struct lp_scene *scene = setup->scene;
struct lp_rast_triangle *point;
unsigned bytes;
struct u_rect bbox;
unsigned nr_planes = 4;
struct point_info info;
/* Bounding rectangle (in pixels) */
{
/* Yes this is necessary to accurately calculate bounding boxes
* with the two fill-conventions we support. GL (normally) ends
* up needing a bottom-left fill convention, which requires
* slightly different rounding.
*/
int adj = (setup->pixel_offset != 0) ? 1 : 0;
bbox.x0 = (x0 + (FIXED_ONE-1) + adj) >> FIXED_ORDER;
bbox.x1 = (x0 + fixed_width + (FIXED_ONE-1) + adj) >> FIXED_ORDER;
bbox.y0 = (y0 + (FIXED_ONE-1)) >> FIXED_ORDER;
bbox.y1 = (y0 + fixed_width + (FIXED_ONE-1)) >> FIXED_ORDER;
/* Inclusive coordinates:
*/
bbox.x1--;
bbox.y1--;
}
if (!u_rect_test_intersection(&setup->draw_region, &bbox)) {
if (0) debug_printf("offscreen\n");
LP_COUNT(nr_culled_tris);
return TRUE;
}
u_rect_find_intersection(&setup->draw_region, &bbox);
point = lp_setup_alloc_triangle(scene,
setup->fs.nr_inputs,
nr_planes,
&bytes);
if (!point)
return FALSE;
#ifdef DEBUG
point->v[0][0] = v0[0][0];
point->v[0][1] = v0[0][1];
#endif
info.v0 = v0;
info.dx01 = 0;
info.dx12 = fixed_width;
info.dy01 = fixed_width;
info.dy12 = 0;
/* Setup parameter interpolants:
*/
setup_point_coefficients(setup, point, &info);
point->inputs.facing = 1.0F;
point->inputs.state = setup->fs.stored;
point->inputs.disable = FALSE;
point->inputs.opaque = FALSE;
{
point->plane[0].dcdx = -1;
point->plane[0].dcdy = 0;
point->plane[0].c = 1-bbox.x0;
point->plane[0].ei = 0;
point->plane[0].eo = 1;
point->plane[1].dcdx = 1;
point->plane[1].dcdy = 0;
point->plane[1].c = bbox.x1+1;
point->plane[1].ei = -1;
point->plane[1].eo = 0;
point->plane[2].dcdx = 0;
point->plane[2].dcdy = 1;
point->plane[2].c = 1-bbox.y0;
point->plane[2].ei = 0;
point->plane[2].eo = 1;
point->plane[3].dcdx = 0;
point->plane[3].dcdy = -1;
point->plane[3].c = bbox.y1+1;
point->plane[3].ei = -1;
point->plane[3].eo = 0;
}
return lp_setup_bin_triangle(setup, point, &bbox, nr_planes);
}
static void
lp_setup_point(struct lp_setup_context *setup,
const float (*v0)[4])
{
if (!try_setup_point( setup, v0 ))
{
lp_setup_flush_and_restart(setup);
if (!try_setup_point( setup, v0 ))
assert(0);
}
}
void
lp_setup_choose_point( struct lp_setup_context *setup )
{
setup->point = lp_setup_point;
}
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