/* If there are lots of sprite points (and why wouldn't there be?) it
* would probably be more sensible to change hardware setup to
* optimize this rather than doing the whole thing in software like
* this.
*/
static void widepoint_point( struct draw_stage *stage,
struct prim_header *header )
{
const struct widepoint_stage *wide = widepoint_stage(stage);
const unsigned pos = draw_current_shader_position_output(stage->draw);
const boolean sprite = (boolean) stage->draw->rasterizer->point_quad_rasterization;
float half_size;
float left_adj, right_adj, bot_adj, top_adj;
struct prim_header tri;
/* four dups of original vertex */
struct vertex_header *v0 = dup_vert(stage, header->v[0], 0);
struct vertex_header *v1 = dup_vert(stage, header->v[0], 1);
struct vertex_header *v2 = dup_vert(stage, header->v[0], 2);
struct vertex_header *v3 = dup_vert(stage, header->v[0], 3);
float *pos0 = v0->data[pos];
float *pos1 = v1->data[pos];
float *pos2 = v2->data[pos];
float *pos3 = v3->data[pos];
/* point size is either per-vertex or fixed size */
if (wide->psize_slot >= 0) {
half_size = header->v[0]->data[wide->psize_slot][0];
half_size *= 0.5f;
}
else {
half_size = wide->half_point_size;
}
left_adj = -half_size + wide->xbias;
right_adj = half_size + wide->xbias;
bot_adj = half_size + wide->ybias;
top_adj = -half_size + wide->ybias;
pos0[0] += left_adj;
pos0[1] += top_adj;
pos1[0] += left_adj;
pos1[1] += bot_adj;
pos2[0] += right_adj;
pos2[1] += top_adj;
pos3[0] += right_adj;
pos3[1] += bot_adj;
if (sprite) {
static const float tex00[4] = { 0, 0, 0, 1 };
static const float tex01[4] = { 0, 1, 0, 1 };
static const float tex11[4] = { 1, 1, 0, 1 };
static const float tex10[4] = { 1, 0, 0, 1 };
set_texcoords( wide, v0, tex00 );
set_texcoords( wide, v1, tex01 );
set_texcoords( wide, v2, tex10 );
set_texcoords( wide, v3, tex11 );
}
tri.det = header->det; /* only the sign matters */
tri.v[0] = v0;
tri.v[1] = v2;
tri.v[2] = v3;
stage->next->tri( stage->next, &tri );
tri.v[0] = v0;
tri.v[1] = v3;
tri.v[2] = v1;
stage->next->tri( stage->next, &tri );
}
static void
widepoint_first_point(struct draw_stage *stage,
struct prim_header *header)
{
struct widepoint_stage *wide = widepoint_stage(stage);
struct draw_context *draw = stage->draw;
struct pipe_context *pipe = draw->pipe;
const struct pipe_rasterizer_state *rast = draw->rasterizer;
void *r;
wide->half_point_size = 0.5f * rast->point_size;
wide->xbias = 0.0;
wide->ybias = 0.0;
if (rast->half_pixel_center) {
wide->xbias = 0.125;
wide->ybias = -0.125;
}
/* Disable triangle culling, stippling, unfilled mode etc. */
r = draw_get_rasterizer_no_cull(draw, rast->scissor, rast->flatshade);
draw->suspend_flushing = TRUE;
pipe->bind_rasterizer_state(pipe, r);
draw->suspend_flushing = FALSE;
/* XXX we won't know the real size if it's computed by the vertex shader! */
if ((rast->point_size > draw->pipeline.wide_point_threshold) ||
(rast->point_quad_rasterization && draw->pipeline.point_sprite)) {
stage->point = widepoint_point;
}
else {
stage->point = draw_pipe_passthrough_point;
}
draw_remove_extra_vertex_attribs(draw);
if (rast->point_quad_rasterization) {
const struct draw_fragment_shader *fs = draw->fs.fragment_shader;
uint i;
assert(fs);
wide->num_texcoord_gen = 0;
/* Loop over fragment shader inputs looking for the PCOORD input or inputs
* for which bit 'k' in sprite_coord_enable is set.
*/
for (i = 0; i < fs->info.num_inputs; i++) {
int slot;
const unsigned sn = fs->info.input_semantic_name[i];
const unsigned si = fs->info.input_semantic_index[i];
if (sn == wide->sprite_coord_semantic) {
/* Note that sprite_coord_enable is a bitfield of 32 bits. */
if (si >= 32 || !(rast->sprite_coord_enable & (1 << si)))
continue;
} else if (sn != TGSI_SEMANTIC_PCOORD) {
continue;
}
/* OK, this generic attribute needs to be replaced with a
* sprite coord (see above).
*/
slot = draw_alloc_extra_vertex_attrib(draw, sn, si);
/* add this slot to the texcoord-gen list */
wide->texcoord_gen_slot[wide->num_texcoord_gen++] = slot;
}
}
wide->psize_slot = -1;
if (rast->point_size_per_vertex) {
/* find PSIZ vertex output */
const struct draw_vertex_shader *vs = draw->vs.vertex_shader;
uint i;
for (i = 0; i < vs->info.num_outputs; i++) {
if (vs->info.output_semantic_name[i] == TGSI_SEMANTIC_PSIZE) {
wide->psize_slot = i;
break;
}
}
}
stage->point( stage, header );
}
static void widepoint_first_point( struct draw_stage *stage,
struct prim_header *header )
{
struct widepoint_stage *wide = widepoint_stage(stage);
struct draw_context *draw = stage->draw;
wide->half_point_size = 0.5f * draw->rasterizer->point_size;
wide->point_size_min = draw->rasterizer->point_size_min;
wide->point_size_max = draw->rasterizer->point_size_max;
wide->xbias = 0.0;
wide->ybias = 0.0;
if (draw->rasterizer->gl_rasterization_rules) {
wide->xbias = 0.125;
}
/* XXX we won't know the real size if it's computed by the vertex shader! */
if ((draw->rasterizer->point_size > draw->pipeline.wide_point_threshold) ||
(draw->rasterizer->point_sprite && draw->pipeline.point_sprite)) {
stage->point = widepoint_point;
}
else {
stage->point = draw_pipe_passthrough_point;
}
if (draw->rasterizer->point_sprite) {
/* find vertex shader texcoord outputs */
const struct draw_vertex_shader *vs = draw->vs.vertex_shader;
uint i, j = 0;
for (i = 0; i < vs->info.num_outputs; i++) {
if (vs->info.output_semantic_name[i] == TGSI_SEMANTIC_GENERIC) {
wide->texcoord_slot[j] = i;
wide->texcoord_mode[j] = draw->rasterizer->sprite_coord_mode[j];
j++;
}
}
wide->num_texcoords = j;
/* find fragment shader PointCoord/Fog input */
wide->point_coord_fs_input = 0; /* XXX fix this! */
/* setup extra vp output (point coord implemented as a texcoord) */
draw->extra_vp_outputs.semantic_name = TGSI_SEMANTIC_GENERIC;
draw->extra_vp_outputs.semantic_index = 0;
draw->extra_vp_outputs.slot = draw->vs.num_vs_outputs;
}
else {
wide->point_coord_fs_input = -1;
draw->extra_vp_outputs.slot = 0;
}
wide->psize_slot = -1;
if (draw->rasterizer->point_size_per_vertex) {
/* find PSIZ vertex output */
const struct draw_vertex_shader *vs = draw->vs.vertex_shader;
uint i;
for (i = 0; i < vs->info.num_outputs; i++) {
if (vs->info.output_semantic_name[i] == TGSI_SEMANTIC_PSIZE) {
wide->psize_slot = i;
break;
}
}
}
stage->point( stage, header );
}
