/**
* Set top row and left column of the tile's pixels to white. For debugging.
*/
static void
outline_tile(uint8_t *tile)
{
const uint8_t val = 0xff;
unsigned i;
for (i = 0; i < TILE_SIZE; i++) {
TILE_PIXEL(tile, i, 0, 0) = val;
TILE_PIXEL(tile, i, 0, 1) = val;
TILE_PIXEL(tile, i, 0, 2) = val;
TILE_PIXEL(tile, i, 0, 3) = val;
TILE_PIXEL(tile, 0, i, 0) = val;
TILE_PIXEL(tile, 0, i, 1) = val;
TILE_PIXEL(tile, 0, i, 2) = val;
TILE_PIXEL(tile, 0, i, 3) = val;
}
}
/**
* Set a tile to a solid color.
*/
static void
clear_tile(struct llvmpipe_cached_tile *tile,
uint8_t clear_color[4])
{
if (clear_color[0] == clear_color[1] &&
clear_color[1] == clear_color[2] &&
clear_color[2] == clear_color[3]) {
memset(tile->color, clear_color[0], TILE_SIZE * TILE_SIZE * 4);
}
else {
uint x, y, chan;
for (y = 0; y < TILE_SIZE; y++)
for (x = 0; x < TILE_SIZE; x++)
for (chan = 0; chan < 4; ++chan)
TILE_PIXEL(tile->color, x, y, chan) = clear_color[chan];
}
}
/**
* Draw grid of gray lines at 16-pixel intervals across the tile to
* show the sub-tile boundaries. For debugging.
*/
static void
outline_subtiles(uint8_t *tile)
{
const uint8_t val = 0x80;
const unsigned step = 16;
unsigned i, j;
for (i = 0; i < TILE_SIZE; i += step) {
for (j = 0; j < TILE_SIZE; j++) {
TILE_PIXEL(tile, i, j, 0) = val;
TILE_PIXEL(tile, i, j, 1) = val;
TILE_PIXEL(tile, i, j, 2) = val;
TILE_PIXEL(tile, i, j, 3) = val;
TILE_PIXEL(tile, j, i, 0) = val;
TILE_PIXEL(tile, j, i, 1) = val;
TILE_PIXEL(tile, j, i, 2) = val;
TILE_PIXEL(tile, j, i, 3) = val;
}
}
outline_tile(tile);
}
/**
* Execute fragment shader for the four fragments in the quad.
*/
ALIGN_STACK
static void
shade_quads(struct llvmpipe_context *llvmpipe,
struct quad_header *quads[],
unsigned nr)
{
struct lp_fragment_shader *fs = llvmpipe->fs;
struct quad_header *quad = quads[0];
const unsigned x = quad->input.x0;
const unsigned y = quad->input.y0;
uint8_t *tile;
uint8_t *color;
void *depth;
uint32_t ALIGN16_ATTRIB mask[4][NUM_CHANNELS];
unsigned chan_index;
unsigned q;
assert(fs->current);
if(!fs->current)
return;
/* Sanity checks */
assert(nr * QUAD_SIZE == TILE_VECTOR_HEIGHT * TILE_VECTOR_WIDTH);
assert(x % TILE_VECTOR_WIDTH == 0);
assert(y % TILE_VECTOR_HEIGHT == 0);
for (q = 0; q < nr; ++q) {
assert(quads[q]->input.x0 == x + q*2);
assert(quads[q]->input.y0 == y);
}
/* mask */
for (q = 0; q < 4; ++q)
for (chan_index = 0; chan_index < NUM_CHANNELS; ++chan_index)
mask[q][chan_index] = quads[q]->inout.mask & (1 << chan_index) ? ~0 : 0;
/* color buffer */
if(llvmpipe->framebuffer.nr_cbufs >= 1 &&
llvmpipe->framebuffer.cbufs[0]) {
tile = lp_get_cached_tile(llvmpipe->cbuf_cache[0], x, y);
color = &TILE_PIXEL(tile, x & (TILE_SIZE-1), y & (TILE_SIZE-1), 0);
}
else
color = NULL;
/* depth buffer */
if(llvmpipe->zsbuf_map) {
assert((x % 2) == 0);
assert((y % 2) == 0);
depth = llvmpipe->zsbuf_map +
y*llvmpipe->zsbuf_transfer->stride +
2*x*llvmpipe->zsbuf_transfer->block.size;
}
else
depth = NULL;
/* XXX: This will most likely fail on 32bit x86 without -mstackrealign */
assert(lp_check_alignment(mask, 16));
assert(lp_check_alignment(depth, 16));
assert(lp_check_alignment(color, 16));
assert(lp_check_alignment(llvmpipe->jit_context.blend_color, 16));
/* run shader */
fs->current->jit_function( &llvmpipe->jit_context,
x, y,
quad->coef->a0,
quad->coef->dadx,
quad->coef->dady,
&mask[0][0],
color,
depth);
}