1 /**************************************************************************
2 *
3 * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
4 * All Rights Reserved.
5 *
6 **************************************************************************/
7
8
9 /**
10 * Implementation of glDrawTex() for GL_OES_draw_tex
11 */
12
13
14
15 #include "main/imports.h"
16 #include "main/image.h"
17 #include "main/macros.h"
18 #include "main/mfeatures.h"
19 #include "program/program.h"
20 #include "program/prog_print.h"
21
22 #include "st_context.h"
23 #include "st_atom.h"
24 #include "st_cb_drawtex.h"
25
26 #include "pipe/p_context.h"
27 #include "pipe/p_defines.h"
28 #include "util/u_inlines.h"
29 #include "pipe/p_shader_tokens.h"
30 #include "util/u_draw_quad.h"
31 #include "util/u_simple_shaders.h"
32 #include "util/u_upload_mgr.h"
33
34 #include "cso_cache/cso_context.h"
35
36
37 #if FEATURE_OES_draw_texture
38
39
40 struct cached_shader
41 {
42 void *handle;
43
44 uint num_attribs;
45 uint semantic_names[2 + MAX_TEXTURE_UNITS];
46 uint semantic_indexes[2 + MAX_TEXTURE_UNITS];
47 };
48
49 #define MAX_SHADERS (2 * MAX_TEXTURE_UNITS)
50
51 /**
52 * Simple linear list cache.
53 * Most of the time there'll only be one cached shader.
54 */
55 static struct cached_shader CachedShaders[MAX_SHADERS];
56 static GLuint NumCachedShaders = 0;
57
58
59 static void *
lookup_shader(struct pipe_context * pipe,uint num_attribs,const uint * semantic_names,const uint * semantic_indexes)60 lookup_shader(struct pipe_context *pipe,
61 uint num_attribs,
62 const uint *semantic_names,
63 const uint *semantic_indexes)
64 {
65 GLuint i, j;
66
67 /* look for existing shader with same attributes */
68 for (i = 0; i < NumCachedShaders; i++) {
69 if (CachedShaders[i].num_attribs == num_attribs) {
70 GLboolean match = GL_TRUE;
71 for (j = 0; j < num_attribs; j++) {
72 if (semantic_names[j] != CachedShaders[i].semantic_names[j] ||
73 semantic_indexes[j] != CachedShaders[i].semantic_indexes[j]) {
74 match = GL_FALSE;
75 break;
76 }
77 }
78 if (match)
79 return CachedShaders[i].handle;
80 }
81 }
82
83 /* not found - create new one now */
84 if (NumCachedShaders >= MAX_SHADERS) {
85 return NULL;
86 }
87
88 CachedShaders[i].num_attribs = num_attribs;
89 for (j = 0; j < num_attribs; j++) {
90 CachedShaders[i].semantic_names[j] = semantic_names[j];
91 CachedShaders[i].semantic_indexes[j] = semantic_indexes[j];
92 }
93
94 CachedShaders[i].handle =
95 util_make_vertex_passthrough_shader(pipe,
96 num_attribs,
97 semantic_names,
98 semantic_indexes);
99 NumCachedShaders++;
100
101 return CachedShaders[i].handle;
102 }
103
104 static void
st_DrawTex(struct gl_context * ctx,GLfloat x,GLfloat y,GLfloat z,GLfloat width,GLfloat height)105 st_DrawTex(struct gl_context *ctx, GLfloat x, GLfloat y, GLfloat z,
106 GLfloat width, GLfloat height)
107 {
108 struct st_context *st = ctx->st;
109 struct pipe_context *pipe = st->pipe;
110 struct cso_context *cso = ctx->st->cso_context;
111 struct pipe_resource *vbuffer = NULL;
112 GLuint i, numTexCoords, numAttribs;
113 GLboolean emitColor;
114 uint semantic_names[2 + MAX_TEXTURE_UNITS];
115 uint semantic_indexes[2 + MAX_TEXTURE_UNITS];
116 struct pipe_vertex_element velements[2 + MAX_TEXTURE_UNITS];
117 unsigned offset;
118
119 st_validate_state(st);
120
121 /* determine if we need vertex color */
122 if (ctx->FragmentProgram._Current->Base.InputsRead & FRAG_BIT_COL0)
123 emitColor = GL_TRUE;
124 else
125 emitColor = GL_FALSE;
126
127 /* determine how many enabled sets of texcoords */
128 numTexCoords = 0;
129 for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
130 if (ctx->Texture.Unit[i]._ReallyEnabled & TEXTURE_2D_BIT) {
131 numTexCoords++;
132 }
133 }
134
135 /* total number of attributes per vertex */
136 numAttribs = 1 + emitColor + numTexCoords;
137
138 /* load vertex buffer */
139 {
140 #define SET_ATTRIB(VERT, ATTR, X, Y, Z, W) \
141 do { \
142 GLuint k = (((VERT) * numAttribs + (ATTR)) * 4); \
143 assert(k < 4 * 4 * numAttribs); \
144 vbuf[k + 0] = X; \
145 vbuf[k + 1] = Y; \
146 vbuf[k + 2] = Z; \
147 vbuf[k + 3] = W; \
148 } while (0)
149
150 const GLfloat x0 = x, y0 = y, x1 = x + width, y1 = y + height;
151 GLfloat *vbuf = NULL;
152 GLuint attr;
153
154 if (u_upload_alloc(st->uploader, 0,
155 numAttribs * 4 * 4 * sizeof(GLfloat),
156 &offset, &vbuffer, (void **) &vbuf) != PIPE_OK) {
157 return;
158 }
159
160 z = CLAMP(z, 0.0f, 1.0f);
161
162 /* positions (in clip coords) */
163 {
164 const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
165 const GLfloat fb_width = (GLfloat)fb->Width;
166 const GLfloat fb_height = (GLfloat)fb->Height;
167
168 const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
169 const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
170 const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
171 const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);
172
173 SET_ATTRIB(0, 0, clip_x0, clip_y0, z, 1.0f); /* lower left */
174 SET_ATTRIB(1, 0, clip_x1, clip_y0, z, 1.0f); /* lower right */
175 SET_ATTRIB(2, 0, clip_x1, clip_y1, z, 1.0f); /* upper right */
176 SET_ATTRIB(3, 0, clip_x0, clip_y1, z, 1.0f); /* upper left */
177
178 semantic_names[0] = TGSI_SEMANTIC_POSITION;
179 semantic_indexes[0] = 0;
180 }
181
182 /* colors */
183 if (emitColor) {
184 const GLfloat *c = ctx->Current.Attrib[VERT_ATTRIB_COLOR0];
185 SET_ATTRIB(0, 1, c[0], c[1], c[2], c[3]);
186 SET_ATTRIB(1, 1, c[0], c[1], c[2], c[3]);
187 SET_ATTRIB(2, 1, c[0], c[1], c[2], c[3]);
188 SET_ATTRIB(3, 1, c[0], c[1], c[2], c[3]);
189 semantic_names[1] = TGSI_SEMANTIC_COLOR;
190 semantic_indexes[1] = 0;
191 attr = 2;
192 }
193 else {
194 attr = 1;
195 }
196
197 /* texcoords */
198 for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
199 if (ctx->Texture.Unit[i]._ReallyEnabled & TEXTURE_2D_BIT) {
200 struct gl_texture_object *obj = ctx->Texture.Unit[i]._Current;
201 struct gl_texture_image *img = obj->Image[0][obj->BaseLevel];
202 const GLfloat wt = (GLfloat) img->Width;
203 const GLfloat ht = (GLfloat) img->Height;
204 const GLfloat s0 = obj->CropRect[0] / wt;
205 const GLfloat t0 = obj->CropRect[1] / ht;
206 const GLfloat s1 = (obj->CropRect[0] + obj->CropRect[2]) / wt;
207 const GLfloat t1 = (obj->CropRect[1] + obj->CropRect[3]) / ht;
208
209 /*printf("crop texcoords: %g, %g .. %g, %g\n", s0, t0, s1, t1);*/
210 SET_ATTRIB(0, attr, s0, t0, 0.0f, 1.0f); /* lower left */
211 SET_ATTRIB(1, attr, s1, t0, 0.0f, 1.0f); /* lower right */
212 SET_ATTRIB(2, attr, s1, t1, 0.0f, 1.0f); /* upper right */
213 SET_ATTRIB(3, attr, s0, t1, 0.0f, 1.0f); /* upper left */
214
215 semantic_names[attr] = TGSI_SEMANTIC_GENERIC;
216 semantic_indexes[attr] = 0;
217
218 attr++;
219 }
220 }
221
222 u_upload_unmap(st->uploader);
223
224 #undef SET_ATTRIB
225 }
226
227
228 cso_save_viewport(cso);
229 cso_save_stream_outputs(cso);
230 cso_save_vertex_shader(cso);
231 cso_save_geometry_shader(cso);
232 cso_save_vertex_elements(cso);
233 cso_save_vertex_buffers(cso);
234
235 {
236 void *vs = lookup_shader(pipe, numAttribs,
237 semantic_names, semantic_indexes);
238 cso_set_vertex_shader_handle(cso, vs);
239 }
240 cso_set_geometry_shader_handle(cso, NULL);
241
242 for (i = 0; i < numAttribs; i++) {
243 velements[i].src_offset = i * 4 * sizeof(float);
244 velements[i].instance_divisor = 0;
245 velements[i].vertex_buffer_index = 0;
246 velements[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
247 }
248 cso_set_vertex_elements(cso, numAttribs, velements);
249 cso_set_stream_outputs(st->cso_context, 0, NULL, 0);
250
251 /* viewport state: viewport matching window dims */
252 {
253 const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
254 const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
255 const GLfloat width = (GLfloat)fb->Width;
256 const GLfloat height = (GLfloat)fb->Height;
257 struct pipe_viewport_state vp;
258 vp.scale[0] = 0.5f * width;
259 vp.scale[1] = height * (invert ? -0.5f : 0.5f);
260 vp.scale[2] = 1.0f;
261 vp.scale[3] = 1.0f;
262 vp.translate[0] = 0.5f * width;
263 vp.translate[1] = 0.5f * height;
264 vp.translate[2] = 0.0f;
265 vp.translate[3] = 0.0f;
266 cso_set_viewport(cso, &vp);
267 }
268
269
270 util_draw_vertex_buffer(pipe, cso, vbuffer,
271 offset, /* offset */
272 PIPE_PRIM_TRIANGLE_FAN,
273 4, /* verts */
274 numAttribs); /* attribs/vert */
275
276
277 pipe_resource_reference(&vbuffer, NULL);
278
279 /* restore state */
280 cso_restore_viewport(cso);
281 cso_restore_vertex_shader(cso);
282 cso_restore_geometry_shader(cso);
283 cso_restore_vertex_elements(cso);
284 cso_restore_vertex_buffers(cso);
285 cso_restore_stream_outputs(cso);
286 }
287
288
289 void
st_init_drawtex_functions(struct dd_function_table * functions)290 st_init_drawtex_functions(struct dd_function_table *functions)
291 {
292 functions->DrawTex = st_DrawTex;
293 }
294
295
296 /**
297 * Free any cached shaders
298 */
299 void
st_destroy_drawtex(struct st_context * st)300 st_destroy_drawtex(struct st_context *st)
301 {
302 GLuint i;
303 for (i = 0; i < NumCachedShaders; i++) {
304 cso_delete_vertex_shader(st->cso_context, CachedShaders[i].handle);
305 }
306 NumCachedShaders = 0;
307 }
308
309
310 #endif /* FEATURE_OES_draw_texture */
311