st_draw.c revision d0eaf6752d6faa8a17e3270b9e64b7c09ef705c2 
1/**************************************************************************
2 *
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
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 TUNGSTEN GRAPHICS 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 <keith@tungstengraphics.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
44#include "vbo/vbo.h"
45
46#include "st_context.h"
47#include "st_atom.h"
48#include "st_cb_bufferobjects.h"
49#include "st_cb_xformfb.h"
50#include "st_debug.h"
51#include "st_draw.h"
52#include "st_program.h"
53
54#include "pipe/p_context.h"
55#include "pipe/p_defines.h"
56#include "util/u_inlines.h"
57#include "util/u_format.h"
58#include "util/u_prim.h"
59#include "util/u_draw_quad.h"
60#include "util/u_upload_mgr.h"
61#include "draw/draw_context.h"
62#include "cso_cache/cso_context.h"
63
64#include "../glsl/ir_uniform.h"
65
66
67/**
68 * This is very similar to vbo_all_varyings_in_vbos() but we are
69 * only interested in per-vertex data.  See bug 38626.
70 */
71static GLboolean
72all_varyings_in_vbos(const struct gl_client_array *arrays[])
73{
74   GLuint i;
75
76   for (i = 0; i < VERT_ATTRIB_MAX; i++)
77      if (arrays[i]->StrideB &&
78          !arrays[i]->InstanceDivisor &&
79          !_mesa_is_bufferobj(arrays[i]->BufferObj))
80	 return GL_FALSE;
81
82   return GL_TRUE;
83}
84
85
86/**
87 * Basically, translate Mesa's index buffer information into
88 * a pipe_index_buffer object.
89 * \return TRUE or FALSE for success/failure
90 */
91static boolean
92setup_index_buffer(struct st_context *st,
93                   const struct _mesa_index_buffer *ib,
94                   struct pipe_index_buffer *ibuffer)
95{
96   struct gl_buffer_object *bufobj = ib->obj;
97
98   ibuffer->index_size = vbo_sizeof_ib_type(ib->type);
99
100   /* get/create the index buffer object */
101   if (_mesa_is_bufferobj(bufobj)) {
102      /* indices are in a real VBO */
103      ibuffer->buffer = st_buffer_object(bufobj)->buffer;
104      ibuffer->offset = pointer_to_offset(ib->ptr);
105   }
106   else if (st->indexbuf_uploader) {
107      /* upload indexes from user memory into a real buffer */
108      if (u_upload_data(st->indexbuf_uploader, 0,
109                        ib->count * ibuffer->index_size, ib->ptr,
110                        &ibuffer->offset, &ibuffer->buffer) != PIPE_OK) {
111         /* out of memory */
112         return FALSE;
113      }
114      u_upload_unmap(st->indexbuf_uploader);
115   }
116   else {
117      /* indices are in user space memory */
118      ibuffer->user_buffer = ib->ptr;
119   }
120
121   cso_set_index_buffer(st->cso_context, ibuffer);
122   return TRUE;
123}
124
125
126/**
127 * Prior to drawing, check that any uniforms referenced by the
128 * current shader have been set.  If a uniform has not been set,
129 * issue a warning.
130 */
131static void
132check_uniforms(struct gl_context *ctx)
133{
134   struct gl_shader_program *shProg[3] = {
135      ctx->Shader.CurrentVertexProgram,
136      ctx->Shader.CurrentGeometryProgram,
137      ctx->Shader.CurrentFragmentProgram,
138   };
139   unsigned j;
140
141   for (j = 0; j < 3; j++) {
142      unsigned i;
143
144      if (shProg[j] == NULL || !shProg[j]->LinkStatus)
145	 continue;
146
147      for (i = 0; i < shProg[j]->NumUserUniformStorage; i++) {
148         const struct gl_uniform_storage *u = &shProg[j]->UniformStorage[i];
149         if (!u->initialized) {
150            _mesa_warning(ctx,
151                          "Using shader with uninitialized uniform: %s",
152                          u->name);
153         }
154      }
155   }
156}
157
158
159/**
160 * Translate OpenGL primtive type (GL_POINTS, GL_TRIANGLE_STRIP, etc) to
161 * the corresponding Gallium type.
162 */
163static unsigned
164translate_prim(const struct gl_context *ctx, unsigned prim)
165{
166   /* GL prims should match Gallium prims, spot-check a few */
167   STATIC_ASSERT(GL_POINTS == PIPE_PRIM_POINTS);
168   STATIC_ASSERT(GL_QUADS == PIPE_PRIM_QUADS);
169   STATIC_ASSERT(GL_TRIANGLE_STRIP_ADJACENCY == PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY);
170
171   /* Avoid quadstrips if it's easy to do so:
172    * Note: it's important to do the correct trimming if we change the
173    * prim type!  We do that wherever this function is called.
174    */
175   if (prim == GL_QUAD_STRIP &&
176       ctx->Light.ShadeModel != GL_FLAT &&
177       ctx->Polygon.FrontMode == GL_FILL &&
178       ctx->Polygon.BackMode == GL_FILL)
179      prim = GL_TRIANGLE_STRIP;
180
181   return prim;
182}
183
184
185/**
186 * This function gets plugged into the VBO module and is called when
187 * we have something to render.
188 * Basically, translate the information into the format expected by gallium.
189 */
190void
191st_draw_vbo(struct gl_context *ctx,
192            const struct _mesa_prim *prims,
193            GLuint nr_prims,
194            const struct _mesa_index_buffer *ib,
195	    GLboolean index_bounds_valid,
196            GLuint min_index,
197            GLuint max_index,
198            struct gl_transform_feedback_object *tfb_vertcount)
199{
200   struct st_context *st = st_context(ctx);
201   struct pipe_index_buffer ibuffer = {0};
202   struct pipe_draw_info info;
203   const struct gl_client_array **arrays = ctx->Array._DrawArrays;
204   unsigned i;
205
206   /* Mesa core state should have been validated already */
207   assert(ctx->NewState == 0x0);
208
209   /* Validate state. */
210   if (st->dirty.st || ctx->NewDriverState) {
211      st_validate_state(st);
212
213#if 0
214      if (MESA_VERBOSE & VERBOSE_GLSL) {
215         check_uniforms(ctx);
216      }
217#else
218      (void) check_uniforms;
219#endif
220   }
221
222   if (st->vertex_array_out_of_memory) {
223      return;
224   }
225
226   util_draw_init_info(&info);
227
228   if (ib) {
229      /* Get index bounds for user buffers. */
230      if (!index_bounds_valid)
231         if (!all_varyings_in_vbos(arrays))
232            vbo_get_minmax_indices(ctx, prims, ib, &min_index, &max_index,
233                                   nr_prims);
234
235      if (!setup_index_buffer(st, ib, &ibuffer)) {
236         _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBegin/DrawElements/DrawArray");
237         return;
238      }
239
240      info.indexed = TRUE;
241      if (min_index != ~0 && max_index != ~0) {
242         info.min_index = min_index;
243         info.max_index = max_index;
244      }
245
246      /* The VBO module handles restart for the non-indexed GLDrawArrays
247       * so we only set these fields for indexed drawing:
248       */
249      info.primitive_restart = ctx->Array._PrimitiveRestart;
250      info.restart_index = ctx->Array.RestartIndex;
251   }
252   else {
253      /* Transform feedback drawing is always non-indexed. */
254      /* Set info.count_from_stream_output. */
255      if (tfb_vertcount) {
256         st_transform_feedback_draw_init(tfb_vertcount, &info);
257      }
258   }
259
260   /* do actual drawing */
261   for (i = 0; i < nr_prims; i++) {
262      info.mode = translate_prim(ctx, prims[i].mode);
263      info.start = prims[i].start;
264      info.count = prims[i].count;
265      info.start_instance = prims[i].base_instance;
266      info.instance_count = prims[i].num_instances;
267      info.index_bias = prims[i].basevertex;
268      if (!ib) {
269         info.min_index = info.start;
270         info.max_index = info.start + info.count - 1;
271      }
272
273      if (ST_DEBUG & DEBUG_DRAW) {
274         debug_printf("st/draw: mode %s  start %u  count %u  indexed %d\n",
275                      u_prim_name(info.mode),
276                      info.start,
277                      info.count,
278                      info.indexed);
279      }
280
281      if (info.count_from_stream_output) {
282         cso_draw_vbo(st->cso_context, &info);
283      }
284      else if (info.primitive_restart) {
285         /* don't trim, restarts might be inside index list */
286         cso_draw_vbo(st->cso_context, &info);
287      }
288      else if (u_trim_pipe_prim(prims[i].mode, &info.count)) {
289         cso_draw_vbo(st->cso_context, &info);
290      }
291   }
292
293   if (ib && st->indexbuf_uploader && !_mesa_is_bufferobj(ib->obj)) {
294      pipe_resource_reference(&ibuffer.buffer, NULL);
295   }
296}
297
298
299void
300st_init_draw(struct st_context *st)
301{
302   struct gl_context *ctx = st->ctx;
303
304   vbo_set_draw_func(ctx, st_draw_vbo);
305
306   st->draw = draw_create(st->pipe); /* for selection/feedback */
307
308   /* Disable draw options that might convert points/lines to tris, etc.
309    * as that would foul-up feedback/selection mode.
310    */
311   draw_wide_line_threshold(st->draw, 1000.0f);
312   draw_wide_point_threshold(st->draw, 1000.0f);
313   draw_enable_line_stipple(st->draw, FALSE);
314   draw_enable_point_sprites(st->draw, FALSE);
315}
316
317
318void
319st_destroy_draw(struct st_context *st)
320{
321   draw_destroy(st->draw);
322}
323