/**
* Allocate an extra vertex/geometry shader vertex attribute, if it doesn't
* exist already.
*
* This is used by some of the optional draw module stages such
* as wide_point which may need to allocate additional generic/texcoord
* attributes.
*/
int
draw_alloc_extra_vertex_attrib(struct draw_context *draw,
uint semantic_name, uint semantic_index)
{
int slot;
uint num_outputs;
uint n;
slot = draw_find_shader_output(draw, semantic_name, semantic_index);
if (slot > 0) {
return slot;
}
num_outputs = draw_current_shader_outputs(draw);
n = draw->extra_shader_outputs.num;
assert(n < Elements(draw->extra_shader_outputs.semantic_name));
draw->extra_shader_outputs.semantic_name[n] = semantic_name;
draw->extra_shader_outputs.semantic_index[n] = semantic_index;
draw->extra_shader_outputs.slot[n] = num_outputs + n;
draw->extra_shader_outputs.num++;
return draw->extra_shader_outputs.slot[n];
}
static void
aapoint_first_point(struct draw_stage *stage, struct prim_header *header)
{
auto struct aapoint_stage *aapoint = aapoint_stage(stage);
struct draw_context *draw = stage->draw;
struct pipe_context *pipe = draw->pipe;
const struct pipe_rasterizer_state *rast = draw->rasterizer;
void *r;
assert(draw->rasterizer->point_smooth);
if (draw->rasterizer->point_size <= 2.0)
aapoint->radius = 1.0;
else
aapoint->radius = 0.5f * draw->rasterizer->point_size;
/*
* Bind (generate) our fragprog.
*/
bind_aapoint_fragment_shader(aapoint);
/* update vertex attrib info */
aapoint->tex_slot = draw_current_shader_outputs(draw);
assert(aapoint->tex_slot > 0); /* output[0] is vertex pos */
aapoint->pos_slot = draw_current_shader_position_output(draw);
draw->extra_shader_outputs.semantic_name = TGSI_SEMANTIC_GENERIC;
draw->extra_shader_outputs.semantic_index = aapoint->fs->generic_attrib;
draw->extra_shader_outputs.slot = aapoint->tex_slot;
/* find psize slot in post-transform vertex */
aapoint->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) {
aapoint->psize_slot = i;
break;
}
}
}
draw->suspend_flushing = TRUE;
/* Disable triangle culling, stippling, unfilled mode etc. */
r = draw_get_rasterizer_no_cull(draw, rast->scissor, rast->flatshade);
pipe->bind_rasterizer_state(pipe, r);
draw->suspend_flushing = FALSE;
/* now really draw first point */
stage->point = aapoint_point;
stage->point(stage, header);
}
static void
aaline_first_line(struct draw_stage *stage, struct prim_header *header)
{
auto struct aaline_stage *aaline = aaline_stage(stage);
struct draw_context *draw = stage->draw;
struct pipe_context *pipe = draw->pipe;
const struct pipe_rasterizer_state *rast = draw->rasterizer;
uint num_samplers;
void *r;
assert(draw->rasterizer->line_smooth);
if (draw->rasterizer->line_width <= 2.2)
aaline->half_line_width = 1.1f;
else
aaline->half_line_width = 0.5f * draw->rasterizer->line_width;
/*
* Bind (generate) our fragprog, sampler and texture
*/
if (!bind_aaline_fragment_shader(aaline)) {
stage->line = draw_pipe_passthrough_line;
stage->line(stage, header);
return;
}
/* update vertex attrib info */
aaline->tex_slot = draw_current_shader_outputs(draw);
aaline->pos_slot = draw_current_shader_position_output(draw);;
/* allocate the extra post-transformed vertex attribute */
(void) draw_alloc_extra_vertex_attrib(draw, TGSI_SEMANTIC_GENERIC,
aaline->fs->generic_attrib);
/* how many samplers? */
/* we'll use sampler/texture[pstip->sampler_unit] for the stipple */
num_samplers = MAX2(aaline->num_sampler_views, aaline->num_samplers);
num_samplers = MAX2(num_samplers, aaline->fs->sampler_unit + 1);
aaline->state.sampler[aaline->fs->sampler_unit] = aaline->sampler_cso;
pipe_sampler_view_reference(&aaline->state.sampler_views[aaline->fs->sampler_unit],
aaline->sampler_view);
draw->suspend_flushing = TRUE;
aaline->driver_bind_sampler_states(pipe, num_samplers, aaline->state.sampler);
aaline->driver_set_sampler_views(pipe, num_samplers, aaline->state.sampler_views);
/* Disable triangle culling, stippling, unfilled mode etc. */
r = draw_get_rasterizer_no_cull(draw, rast->scissor, rast->flatshade);
pipe->bind_rasterizer_state(pipe, r);
draw->suspend_flushing = FALSE;
/* now really draw first line */
stage->line = aaline_line;
stage->line(stage, header);
}
/**
* Allocate an extra vertex/geometry shader vertex attribute.
* This is used by some of the optional draw module stages such
* as wide_point which may need to allocate additional generic/texcoord
* attributes.
*/
int
draw_alloc_extra_vertex_attrib(struct draw_context *draw,
uint semantic_name, uint semantic_index)
{
const int num_outputs = draw_current_shader_outputs(draw);
const int n = draw->extra_shader_outputs.num;
assert(n < Elements(draw->extra_shader_outputs.semantic_name));
draw->extra_shader_outputs.semantic_name[n] = semantic_name;
draw->extra_shader_outputs.semantic_index[n] = semantic_index;
draw->extra_shader_outputs.slot[n] = num_outputs + n;
draw->extra_shader_outputs.num++;
return draw->extra_shader_outputs.slot[n];
}
/* Interpolate between two vertices to produce a third.
*/
static void interp( const struct clip_stage *clip,
struct vertex_header *dst,
float t,
const struct vertex_header *out,
const struct vertex_header *in )
{
const unsigned nr_attrs = draw_current_shader_outputs(clip->stage.draw);
const unsigned pos_attr = draw_current_shader_position_output(clip->stage.draw);
unsigned j;
/* Vertex header.
*/
dst->clipmask = 0;
dst->edgeflag = 0; /* will get overwritten later */
dst->pad = 0;
dst->vertex_id = UNDEFINED_VERTEX_ID;
/* Interpolate the clip-space coords.
*/
interp_attr(dst->clip, t, in->clip, out->clip);
/* Do the projective divide and viewport transformation to get
* new window coordinates:
*/
{
const float *pos = dst->clip;
const float *scale = clip->stage.draw->viewport.scale;
const float *trans = clip->stage.draw->viewport.translate;
const float oow = 1.0f / pos[3];
dst->data[pos_attr][0] = pos[0] * oow * scale[0] + trans[0];
dst->data[pos_attr][1] = pos[1] * oow * scale[1] + trans[1];
dst->data[pos_attr][2] = pos[2] * oow * scale[2] + trans[2];
dst->data[pos_attr][3] = oow;
}
/* Other attributes
*/
for (j = 0; j < nr_attrs; j++) {
if (j != pos_attr)
interp_attr(dst->data[j], t, in->data[j], out->data[j]);
}
}
/**
* Compute interpolated vertex attributes for 'dst' at position 't'
* between 'v0' and 'v1'.
* XXX using linear interpolation for all attribs at this time.
*/
static void
screen_interp( struct draw_context *draw,
struct vertex_header *dst,
float t,
const struct vertex_header *v0,
const struct vertex_header *v1 )
{
uint attr;
uint num_outputs = draw_current_shader_outputs(draw);
for (attr = 0; attr < num_outputs; attr++) {
const float *val0 = v0->data[attr];
const float *val1 = v1->data[attr];
float *newv = dst->data[attr];
uint i;
for (i = 0; i < 4; i++) {
newv[i] = val0[i] + t * (val1[i] - val0[i]);
}
}
}
/* Interpolate between two vertices to produce a third.
*/
static void interp( const struct clip_stage *clip,
struct vertex_header *dst,
float t,
const struct vertex_header *out,
const struct vertex_header *in )
{
const unsigned nr_attrs = draw_current_shader_outputs(clip->stage.draw);
const unsigned pos_attr = draw_current_shader_position_output(clip->stage.draw);
const unsigned clip_attr = draw_current_shader_clipvertex_output(clip->stage.draw);
unsigned j;
float t_nopersp;
/* Vertex header.
*/
dst->clipmask = 0;
dst->edgeflag = 0; /* will get overwritten later */
dst->have_clipdist = in->have_clipdist;
dst->vertex_id = UNDEFINED_VERTEX_ID;
/* Interpolate the clip-space coords.
*/
interp_attr(dst->clip, t, in->clip, out->clip);
/* interpolate the clip-space position */
interp_attr(dst->pre_clip_pos, t, in->pre_clip_pos, out->pre_clip_pos);
/* Do the projective divide and viewport transformation to get
* new window coordinates:
*/
{
const float *pos = dst->pre_clip_pos;
const float *scale = clip->stage.draw->viewport.scale;
const float *trans = clip->stage.draw->viewport.translate;
const float oow = 1.0f / pos[3];
dst->data[pos_attr][0] = pos[0] * oow * scale[0] + trans[0];
dst->data[pos_attr][1] = pos[1] * oow * scale[1] + trans[1];
dst->data[pos_attr][2] = pos[2] * oow * scale[2] + trans[2];
dst->data[pos_attr][3] = oow;
}
/**
* Compute the t in screen-space instead of 3d space to use
* for noperspective interpolation.
*
* The points can be aligned with the X axis, so in that case try
* the Y. When both points are at the same screen position, we can
* pick whatever value (the interpolated point won't be in front
* anyway), so just use the 3d t.
*/
{
int k;
t_nopersp = t;
/* find either in.x != out.x or in.y != out.y */
for (k = 0; k < 2; k++) {
if (in->clip[k] != out->clip[k]) {
/* do divide by W, then compute linear interpolation factor */
float in_coord = in->clip[k] / in->clip[3];
float out_coord = out->clip[k] / out->clip[3];
float dst_coord = dst->clip[k] / dst->clip[3];
t_nopersp = (dst_coord - out_coord) / (in_coord - out_coord);
break;
}
}
}
/* Other attributes
*/
for (j = 0; j < nr_attrs; j++) {
if (j != pos_attr && j != clip_attr) {
if (clip->noperspective_attribs[j])
interp_attr(dst->data[j], t_nopersp, in->data[j], out->data[j]);
else
interp_attr(dst->data[j], t, in->data[j], out->data[j]);
}
}
}
