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1 /**************************************************************************
2  *
3  * Copyright 2007 VMware, Inc.
4  * All Rights Reserved.
5  *
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:
13  *
14  * The above copyright notice and this permission notice (including the
15  * next paragraph) shall be included in all copies or substantial portions
16  * of the Software.
17  *
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.
25  *
26  **************************************************************************/
27 
28 /*
29  * This file implements the st_draw_vbo() function which is called from
30  * Mesa's VBO module.  All point/line/triangle rendering is done through
31  * this function whether the user called glBegin/End, glDrawArrays,
32  * glDrawElements, glEvalMesh, or glCalList, etc.
33  *
34  * Authors:
35  *   Keith Whitwell <keithw@vmware.com>
36  */
37 
38 
39 #include "main/imports.h"
40 #include "main/image.h"
41 #include "main/bufferobj.h"
42 #include "main/macros.h"
43 #include "main/varray.h"
44 
45 #include "compiler/glsl/ir_uniform.h"
46 
47 #include "vbo/vbo.h"
48 
49 #include "st_context.h"
50 #include "st_atom.h"
51 #include "st_cb_bitmap.h"
52 #include "st_cb_bufferobjects.h"
53 #include "st_cb_xformfb.h"
54 #include "st_debug.h"
55 #include "st_draw.h"
56 #include "st_program.h"
57 
58 #include "pipe/p_context.h"
59 #include "pipe/p_defines.h"
60 #include "util/u_inlines.h"
61 #include "util/u_format.h"
62 #include "util/u_prim.h"
63 #include "util/u_draw.h"
64 #include "util/u_upload_mgr.h"
65 #include "draw/draw_context.h"
66 #include "cso_cache/cso_context.h"
67 
68 
69 /**
70  * Set the restart index.
71  */
72 static void
setup_primitive_restart(struct gl_context * ctx,struct pipe_draw_info * info)73 setup_primitive_restart(struct gl_context *ctx, struct pipe_draw_info *info)
74 {
75    if (ctx->Array._PrimitiveRestart) {
76       unsigned index_size = info->index_size;
77 
78       info->restart_index =
79          _mesa_primitive_restart_index(ctx, index_size);
80 
81       /* Enable primitive restart only when the restart index can have an
82        * effect. This is required for correctness in radeonsi VI support.
83        * Other hardware may also benefit from taking a faster, non-restart path
84        * when possible.
85        */
86       if (index_size == 4 || info->restart_index < (1 << (index_size * 8)))
87          info->primitive_restart = true;
88    }
89 }
90 
91 
92 /**
93  * Translate OpenGL primtive type (GL_POINTS, GL_TRIANGLE_STRIP, etc) to
94  * the corresponding Gallium type.
95  */
96 static unsigned
translate_prim(const struct gl_context * ctx,unsigned prim)97 translate_prim(const struct gl_context *ctx, unsigned prim)
98 {
99    /* GL prims should match Gallium prims, spot-check a few */
100    STATIC_ASSERT(GL_POINTS == PIPE_PRIM_POINTS);
101    STATIC_ASSERT(GL_QUADS == PIPE_PRIM_QUADS);
102    STATIC_ASSERT(GL_TRIANGLE_STRIP_ADJACENCY == PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY);
103    STATIC_ASSERT(GL_PATCHES == PIPE_PRIM_PATCHES);
104 
105    return prim;
106 }
107 
108 static inline void
prepare_draw(struct st_context * st,struct gl_context * ctx)109 prepare_draw(struct st_context *st, struct gl_context *ctx)
110 {
111    /* Mesa core state should have been validated already */
112    assert(ctx->NewState == 0x0);
113 
114    if (unlikely(!st->bitmap.cache.empty))
115       st_flush_bitmap_cache(st);
116 
117    st_invalidate_readpix_cache(st);
118 
119    /* Validate state. */
120    if ((st->dirty | ctx->NewDriverState) & ST_PIPELINE_RENDER_STATE_MASK ||
121        st->gfx_shaders_may_be_dirty) {
122       st_validate_state(st, ST_PIPELINE_RENDER);
123    }
124 }
125 
126 /**
127  * This function gets plugged into the VBO module and is called when
128  * we have something to render.
129  * Basically, translate the information into the format expected by gallium.
130  */
131 static void
st_draw_vbo(struct gl_context * ctx,const struct _mesa_prim * prims,GLuint nr_prims,const struct _mesa_index_buffer * ib,GLboolean index_bounds_valid,GLuint min_index,GLuint max_index,struct gl_transform_feedback_object * tfb_vertcount,unsigned stream,struct gl_buffer_object * indirect)132 st_draw_vbo(struct gl_context *ctx,
133             const struct _mesa_prim *prims,
134             GLuint nr_prims,
135             const struct _mesa_index_buffer *ib,
136 	    GLboolean index_bounds_valid,
137             GLuint min_index,
138             GLuint max_index,
139             struct gl_transform_feedback_object *tfb_vertcount,
140             unsigned stream,
141             struct gl_buffer_object *indirect)
142 {
143    struct st_context *st = st_context(ctx);
144    struct pipe_draw_info info;
145    unsigned i;
146    unsigned start = 0;
147 
148    prepare_draw(st, ctx);
149 
150    if (st->vertex_array_out_of_memory)
151       return;
152 
153    /* Initialize pipe_draw_info. */
154    info.primitive_restart = false;
155    info.vertices_per_patch = ctx->TessCtrlProgram.patch_vertices;
156    info.indirect = NULL;
157    info.count_from_stream_output = NULL;
158 
159    if (ib) {
160       struct gl_buffer_object *bufobj = ib->obj;
161 
162       /* Get index bounds for user buffers. */
163       if (!index_bounds_valid && st->draw_needs_minmax_index) {
164          vbo_get_minmax_indices(ctx, prims, ib, &min_index, &max_index,
165                                 nr_prims);
166       }
167 
168       info.index_size = ib->index_size;
169       info.min_index = min_index;
170       info.max_index = max_index;
171 
172       if (_mesa_is_bufferobj(bufobj)) {
173          /* indices are in a real VBO */
174          info.has_user_indices = false;
175          info.index.resource = st_buffer_object(bufobj)->buffer;
176          start = pointer_to_offset(ib->ptr) / info.index_size;
177       } else {
178          /* indices are in user space memory */
179          info.has_user_indices = true;
180          info.index.user = ib->ptr;
181       }
182 
183       setup_primitive_restart(ctx, &info);
184    }
185    else {
186       info.index_size = 0;
187       info.has_user_indices = false;
188 
189       /* Transform feedback drawing is always non-indexed. */
190       /* Set info.count_from_stream_output. */
191       if (tfb_vertcount) {
192          if (!st_transform_feedback_draw_init(tfb_vertcount, stream, &info))
193             return;
194       }
195    }
196 
197    assert(!indirect);
198 
199    /* do actual drawing */
200    for (i = 0; i < nr_prims; i++) {
201       info.count = prims[i].count;
202 
203       /* Skip no-op draw calls. */
204       if (!info.count && !tfb_vertcount)
205          continue;
206 
207       info.mode = translate_prim(ctx, prims[i].mode);
208       info.start = start + prims[i].start;
209       info.start_instance = prims[i].base_instance;
210       info.instance_count = prims[i].num_instances;
211       info.index_bias = prims[i].basevertex;
212       info.drawid = prims[i].draw_id;
213       if (!ib) {
214          info.min_index = info.start;
215          info.max_index = info.start + info.count - 1;
216       }
217 
218       if (ST_DEBUG & DEBUG_DRAW) {
219          debug_printf("st/draw: mode %s  start %u  count %u  index_size %d\n",
220                       u_prim_name(info.mode),
221                       info.start,
222                       info.count,
223                       info.index_size);
224       }
225 
226       /* Don't call u_trim_pipe_prim. Drivers should do it if they need it. */
227       cso_draw_vbo(st->cso_context, &info);
228    }
229 }
230 
231 static void
st_indirect_draw_vbo(struct gl_context * ctx,GLuint mode,struct gl_buffer_object * indirect_data,GLsizeiptr indirect_offset,unsigned draw_count,unsigned stride,struct gl_buffer_object * indirect_params,GLsizeiptr indirect_params_offset,const struct _mesa_index_buffer * ib)232 st_indirect_draw_vbo(struct gl_context *ctx,
233                      GLuint mode,
234                      struct gl_buffer_object *indirect_data,
235                      GLsizeiptr indirect_offset,
236                      unsigned draw_count,
237                      unsigned stride,
238                      struct gl_buffer_object *indirect_params,
239                      GLsizeiptr indirect_params_offset,
240                      const struct _mesa_index_buffer *ib)
241 {
242    struct st_context *st = st_context(ctx);
243    struct pipe_draw_info info;
244    struct pipe_draw_indirect_info indirect;
245 
246    assert(stride);
247    prepare_draw(st, ctx);
248 
249    if (st->vertex_array_out_of_memory)
250       return;
251 
252    memset(&indirect, 0, sizeof(indirect));
253    util_draw_init_info(&info);
254    info.start = 0; /* index offset / index size */
255 
256    if (ib) {
257       struct gl_buffer_object *bufobj = ib->obj;
258 
259       /* indices are always in a real VBO */
260       assert(_mesa_is_bufferobj(bufobj));
261 
262       info.index_size = ib->index_size;
263       info.index.resource = st_buffer_object(bufobj)->buffer;
264       info.start = pointer_to_offset(ib->ptr) / info.index_size;
265 
266       /* Primitive restart is not handled by the VBO module in this case. */
267       setup_primitive_restart(ctx, &info);
268    }
269 
270    info.mode = translate_prim(ctx, mode);
271    info.vertices_per_patch = ctx->TessCtrlProgram.patch_vertices;
272    info.indirect = &indirect;
273    indirect.buffer = st_buffer_object(indirect_data)->buffer;
274    indirect.offset = indirect_offset;
275 
276    if (ST_DEBUG & DEBUG_DRAW) {
277       debug_printf("st/draw indirect: mode %s drawcount %d index_size %d\n",
278                    u_prim_name(info.mode),
279                    draw_count,
280                    info.index_size);
281    }
282 
283    if (!st->has_multi_draw_indirect) {
284       int i;
285 
286       assert(!indirect_params);
287       indirect.draw_count = 1;
288       for (i = 0; i < draw_count; i++) {
289          info.drawid = i;
290          cso_draw_vbo(st->cso_context, &info);
291          indirect.offset += stride;
292       }
293    } else {
294       indirect.draw_count = draw_count;
295       indirect.stride = stride;
296       if (indirect_params) {
297          indirect.indirect_draw_count = st_buffer_object(indirect_params)->buffer;
298          indirect.indirect_draw_count_offset = indirect_params_offset;
299       }
300       cso_draw_vbo(st->cso_context, &info);
301    }
302 }
303 
304 
305 void
st_init_draw(struct st_context * st)306 st_init_draw(struct st_context *st)
307 {
308    struct gl_context *ctx = st->ctx;
309 
310    vbo_set_draw_func(ctx, st_draw_vbo);
311    vbo_set_indirect_draw_func(ctx, st_indirect_draw_vbo);
312 }
313 
314 
315 void
st_destroy_draw(struct st_context * st)316 st_destroy_draw(struct st_context *st)
317 {
318    draw_destroy(st->draw);
319 }
320 
321 /**
322  * Getter for the draw_context, so that initialization of it can happen only
323  * when needed (the TGSI exec machines take up quite a bit of memory).
324  */
325 struct draw_context *
st_get_draw_context(struct st_context * st)326 st_get_draw_context(struct st_context *st)
327 {
328    if (!st->draw) {
329       st->draw = draw_create(st->pipe);
330       if (!st->draw) {
331          _mesa_error(st->ctx, GL_OUT_OF_MEMORY, "feedback fallback allocation");
332          return NULL;
333       }
334    }
335 
336    /* Disable draw options that might convert points/lines to tris, etc.
337     * as that would foul-up feedback/selection mode.
338     */
339    draw_wide_line_threshold(st->draw, 1000.0f);
340    draw_wide_point_threshold(st->draw, 1000.0f);
341    draw_enable_line_stipple(st->draw, FALSE);
342    draw_enable_point_sprites(st->draw, FALSE);
343 
344    return st->draw;
345 }
346 
347 /**
348  * Draw a quad with given position, texcoords and color.
349  */
350 bool
st_draw_quad(struct st_context * st,float x0,float y0,float x1,float y1,float z,float s0,float t0,float s1,float t1,const float * color,unsigned num_instances)351 st_draw_quad(struct st_context *st,
352              float x0, float y0, float x1, float y1, float z,
353              float s0, float t0, float s1, float t1,
354              const float *color,
355              unsigned num_instances)
356 {
357    struct pipe_vertex_buffer vb = {0};
358    struct st_util_vertex *verts;
359 
360    vb.stride = sizeof(struct st_util_vertex);
361 
362    u_upload_alloc(st->pipe->stream_uploader, 0,
363                   4 * sizeof(struct st_util_vertex), 4,
364                   &vb.buffer_offset, &vb.buffer.resource, (void **) &verts);
365    if (!vb.buffer.resource) {
366       return false;
367    }
368 
369    /* lower-left */
370    verts[0].x = x0;
371    verts[0].y = y1;
372    verts[0].z = z;
373    verts[0].r = color[0];
374    verts[0].g = color[1];
375    verts[0].b = color[2];
376    verts[0].a = color[3];
377    verts[0].s = s0;
378    verts[0].t = t0;
379 
380    /* lower-right */
381    verts[1].x = x1;
382    verts[1].y = y1;
383    verts[1].z = z;
384    verts[1].r = color[0];
385    verts[1].g = color[1];
386    verts[1].b = color[2];
387    verts[1].a = color[3];
388    verts[1].s = s1;
389    verts[1].t = t0;
390 
391    /* upper-right */
392    verts[2].x = x1;
393    verts[2].y = y0;
394    verts[2].z = z;
395    verts[2].r = color[0];
396    verts[2].g = color[1];
397    verts[2].b = color[2];
398    verts[2].a = color[3];
399    verts[2].s = s1;
400    verts[2].t = t1;
401 
402    /* upper-left */
403    verts[3].x = x0;
404    verts[3].y = y0;
405    verts[3].z = z;
406    verts[3].r = color[0];
407    verts[3].g = color[1];
408    verts[3].b = color[2];
409    verts[3].a = color[3];
410    verts[3].s = s0;
411    verts[3].t = t1;
412 
413    u_upload_unmap(st->pipe->stream_uploader);
414 
415    /* At the time of writing, cso_get_aux_vertex_buffer_slot() always returns
416     * zero.  If that ever changes we need to audit the calls to that function
417     * and make sure the slot number is used consistently everywhere.
418     */
419    assert(cso_get_aux_vertex_buffer_slot(st->cso_context) == 0);
420 
421    cso_set_vertex_buffers(st->cso_context,
422                           cso_get_aux_vertex_buffer_slot(st->cso_context),
423                           1, &vb);
424 
425    if (num_instances > 1) {
426       cso_draw_arrays_instanced(st->cso_context, PIPE_PRIM_TRIANGLE_FAN, 0, 4,
427                                 0, num_instances);
428    } else {
429       cso_draw_arrays(st->cso_context, PIPE_PRIM_TRIANGLE_FAN, 0, 4);
430    }
431 
432    pipe_resource_reference(&vb.buffer.resource, NULL);
433 
434    return true;
435 }
436