1
/**************************************************************************
3
* Copyright 2007 VMware, Inc.
6
* Permission is hereby granted, free of charge, to any person obtaining a
7
* copy of this software and associated documentation files (the
8
* "Software"), to deal in the Software without restriction, including
9
* without limitation the rights to use, copy, modify, merge, publish,
10
* distribute, sub license, and/or sell copies of the Software, and to
11
* permit persons to whom the Software is furnished to do so, subject to
12
* the following conditions:
14
* The above copyright notice and this permission notice (including the
15
* next paragraph) shall be included in all copies or substantial portions
18
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26
**************************************************************************/
28
/* Authors: Keith Whitwell <keithw@vmware.com>
32
* Notes on wide points and sprite mode:
34
* In wide point/sprite mode we effectively need to convert each incoming
35
* vertex into four outgoing vertices specifying the corners of a quad.
36
* Since we don't (yet) have geometry shaders, we have to handle this here
39
* For sprites, it also means that this is where we have to handle texcoords
40
* for the vertices of the quad. OpenGL's GL_COORD_REPLACE state specifies
41
* if/how enabled texcoords are automatically generated for sprites. We pass
42
* that info through gallium in the pipe_rasterizer_state::sprite_coord_mode
45
* Additionally, GLSL's gl_PointCoord fragment attribute has to be handled
46
* here as well. This is basically an additional texture/generic attribute
47
* that varies .x from 0 to 1 horizontally across the point and varies .y
48
* vertically from 0 to 1 down the sprite.
50
* With geometry shaders, the gallium frontends could create a GS to do
55
#include "pipe/p_screen.h"
56
#include "pipe/p_context.h"
57
#include "util/u_math.h"
58
#include "util/u_memory.h"
59
#include "pipe/p_defines.h"
60
#include "pipe/p_shader_tokens.h"
63
#include "draw_pipe.h"
66
struct widepoint_stage {
67
struct draw_stage stage; /**< base class */
69
float half_point_size;
74
/** for automatic texcoord generation/replacement */
75
uint num_texcoord_gen;
76
uint texcoord_gen_slot[PIPE_MAX_SHADER_OUTPUTS];
78
/* TGSI_SEMANTIC to which sprite_coord_enable applies */
79
enum tgsi_semantic sprite_coord_semantic;
86
static inline struct widepoint_stage *
87
widepoint_stage( struct draw_stage *stage )
89
return (struct widepoint_stage *)stage;
94
* Set the vertex texcoords for sprite mode.
95
* Coords may be left untouched or set to a right-side-up or upside-down
98
static void set_texcoords(const struct widepoint_stage *wide,
99
struct vertex_header *v, const float tc[4])
101
const struct draw_context *draw = wide->stage.draw;
102
const struct pipe_rasterizer_state *rast = draw->rasterizer;
103
const uint texcoord_mode = rast->sprite_coord_mode;
106
for (i = 0; i < wide->num_texcoord_gen; i++) {
107
const uint slot = wide->texcoord_gen_slot[i];
108
v->data[slot][0] = tc[0];
109
if (texcoord_mode == PIPE_SPRITE_COORD_LOWER_LEFT)
110
v->data[slot][1] = 1.0f - tc[1];
112
v->data[slot][1] = tc[1];
113
v->data[slot][2] = tc[2];
114
v->data[slot][3] = tc[3];
119
/* If there are lots of sprite points (and why wouldn't there be?) it
120
* would probably be more sensible to change hardware setup to
121
* optimize this rather than doing the whole thing in software like
124
static void widepoint_point( struct draw_stage *stage,
125
struct prim_header *header )
127
const struct widepoint_stage *wide = widepoint_stage(stage);
128
const unsigned pos = draw_current_shader_position_output(stage->draw);
129
const boolean sprite = (boolean) stage->draw->rasterizer->point_quad_rasterization;
131
float left_adj, right_adj, bot_adj, top_adj;
133
struct prim_header tri;
135
/* four dups of original vertex */
136
struct vertex_header *v0 = dup_vert(stage, header->v[0], 0);
137
struct vertex_header *v1 = dup_vert(stage, header->v[0], 1);
138
struct vertex_header *v2 = dup_vert(stage, header->v[0], 2);
139
struct vertex_header *v3 = dup_vert(stage, header->v[0], 3);
141
float *pos0 = v0->data[pos];
142
float *pos1 = v1->data[pos];
143
float *pos2 = v2->data[pos];
144
float *pos3 = v3->data[pos];
146
/* point size is either per-vertex or fixed size */
147
if (wide->psize_slot >= 0) {
148
half_size = header->v[0]->data[wide->psize_slot][0];
152
half_size = wide->half_point_size;
155
left_adj = -half_size + wide->xbias;
156
right_adj = half_size + wide->xbias;
157
bot_adj = half_size + wide->ybias;
158
top_adj = -half_size + wide->ybias;
166
pos2[0] += right_adj;
169
pos3[0] += right_adj;
173
static const float tex00[4] = { 0, 0, 0, 1 };
174
static const float tex01[4] = { 0, 1, 0, 1 };
175
static const float tex11[4] = { 1, 1, 0, 1 };
176
static const float tex10[4] = { 1, 0, 0, 1 };
177
set_texcoords( wide, v0, tex00 );
178
set_texcoords( wide, v1, tex01 );
179
set_texcoords( wide, v2, tex10 );
180
set_texcoords( wide, v3, tex11 );
183
tri.det = header->det; /* only the sign matters */
187
stage->next->tri( stage->next, &tri );
192
stage->next->tri( stage->next, &tri );
197
widepoint_first_point(struct draw_stage *stage,
198
struct prim_header *header)
200
struct widepoint_stage *wide = widepoint_stage(stage);
201
struct draw_context *draw = stage->draw;
202
struct pipe_context *pipe = draw->pipe;
203
const struct pipe_rasterizer_state *rast = draw->rasterizer;
206
wide->half_point_size = 0.5f * rast->point_size;
210
if (rast->half_pixel_center) {
212
wide->ybias = -0.125;
215
/* Disable triangle culling, stippling, unfilled mode etc. */
216
r = draw_get_rasterizer_no_cull(draw, rast);
217
draw->suspend_flushing = TRUE;
218
pipe->bind_rasterizer_state(pipe, r);
219
draw->suspend_flushing = FALSE;
221
/* XXX we won't know the real size if it's computed by the vertex shader! */
222
if ((rast->point_size > draw->pipeline.wide_point_threshold) ||
223
(rast->point_quad_rasterization && draw->pipeline.point_sprite)) {
224
stage->point = widepoint_point;
227
stage->point = draw_pipe_passthrough_point;
230
draw_remove_extra_vertex_attribs(draw);
232
if (rast->point_quad_rasterization) {
233
const struct draw_fragment_shader *fs = draw->fs.fragment_shader;
238
wide->num_texcoord_gen = 0;
240
/* Loop over fragment shader inputs looking for the PCOORD input or inputs
241
* for which bit 'k' in sprite_coord_enable is set.
243
for (i = 0; i < fs->info.num_inputs; i++) {
245
const enum tgsi_semantic sn = fs->info.input_semantic_name[i];
246
const unsigned si = fs->info.input_semantic_index[i];
248
if (sn == wide->sprite_coord_semantic) {
249
/* Note that sprite_coord_enable is a bitfield of 32 bits. */
250
if (si >= 32 || !(rast->sprite_coord_enable & (1 << si)))
252
} else if (sn != TGSI_SEMANTIC_PCOORD) {
256
/* OK, this generic attribute needs to be replaced with a
257
* sprite coord (see above).
259
slot = draw_alloc_extra_vertex_attrib(draw, sn, si);
261
/* add this slot to the texcoord-gen list */
262
wide->texcoord_gen_slot[wide->num_texcoord_gen++] = slot;
266
wide->psize_slot = -1;
267
if (rast->point_size_per_vertex) {
268
/* find PSIZ vertex output */
269
wide->psize_slot = draw_find_shader_output(draw, TGSI_SEMANTIC_PSIZE, 0);
272
stage->point( stage, header );
276
static void widepoint_flush( struct draw_stage *stage, unsigned flags )
278
struct draw_context *draw = stage->draw;
279
struct pipe_context *pipe = draw->pipe;
281
stage->point = widepoint_first_point;
282
stage->next->flush( stage->next, flags );
284
draw_remove_extra_vertex_attribs(draw);
286
/* restore original rasterizer state */
287
if (draw->rast_handle) {
288
draw->suspend_flushing = TRUE;
289
pipe->bind_rasterizer_state(pipe, draw->rast_handle);
290
draw->suspend_flushing = FALSE;
295
static void widepoint_reset_stipple_counter( struct draw_stage *stage )
297
stage->next->reset_stipple_counter( stage->next );
301
static void widepoint_destroy( struct draw_stage *stage )
303
draw_free_temp_verts( stage );
308
struct draw_stage *draw_wide_point_stage( struct draw_context *draw )
310
struct widepoint_stage *wide = CALLOC_STRUCT(widepoint_stage);
314
wide->stage.draw = draw;
315
wide->stage.name = "wide-point";
316
wide->stage.next = NULL;
317
wide->stage.point = widepoint_first_point;
318
wide->stage.line = draw_pipe_passthrough_line;
319
wide->stage.tri = draw_pipe_passthrough_tri;
320
wide->stage.flush = widepoint_flush;
321
wide->stage.reset_stipple_counter = widepoint_reset_stipple_counter;
322
wide->stage.destroy = widepoint_destroy;
324
if (!draw_alloc_temp_verts( &wide->stage, 4 ))
327
wide->sprite_coord_semantic =
328
draw->pipe->screen->get_param(draw->pipe->screen, PIPE_CAP_TGSI_TEXCOORD)
330
TGSI_SEMANTIC_TEXCOORD : TGSI_SEMANTIC_GENERIC;
336
wide->stage.destroy( &wide->stage );