src/mesa/state_tracker/st_draw.c

   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  */
  71 static GLboolean
  72 all_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  */
  91 static boolean
  92 setup_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       if (u_upload_data(st->indexbuf_uploader, 0,
 108                         ib->count * ibuffer->index_size, ib->ptr,
 109                         &ibuffer->offset, &ibuffer->buffer) != PIPE_OK) {
 110          /* out of memory */
 111          return FALSE;
 112       }
 113       u_upload_unmap(st->indexbuf_uploader);
 114    }
 115    else {
 116       /* indices are in user space memory */
 117       ibuffer->user_buffer = ib->ptr;
 118    }
 119
 120    cso_set_index_buffer(st->cso_context, ibuffer);
 121    return TRUE;
 122 }
 123
 124
 125 /**
 126  * Prior to drawing, check that any uniforms referenced by the
 127  * current shader have been set.  If a uniform has not been set,
 128  * issue a warning.
 129  */
 130 static void
 131 check_uniforms(struct gl_context *ctx)
 132 {
 133    struct gl_shader_program *shProg[3] = {
 134       ctx->Shader.CurrentVertexProgram,
 135       ctx->Shader.CurrentGeometryProgram,
 136       ctx->Shader.CurrentFragmentProgram,
 137    };
 138    unsigned j;
 139
 140    for (j = 0; j < 3; j++) {
 141       unsigned i;
 142
 143       if (shProg[j] == NULL || !shProg[j]->LinkStatus)
 144          continue;
 145
 146       for (i = 0; i < shProg[j]->NumUserUniformStorage; i++) {
 147          const struct gl_uniform_storage *u = &shProg[j]->UniformStorage[i];
 148          if (!u->initialized) {
 149             _mesa_warning(ctx,
 150                           "Using shader with uninitialized uniform: %s",
 151                           u->name);
 152          }
 153       }
 154    }
 155 }
 156
 157
 158 /**
 159  * Translate OpenGL primtive type (GL_POINTS, GL_TRIANGLE_STRIP, etc) to
 160  * the corresponding Gallium type.
 161  */
 162 static unsigned
 163 translate_prim(const struct gl_context *ctx, unsigned prim)
 164 {
 165    /* GL prims should match Gallium prims, spot-check a few */
 166    STATIC_ASSERT(GL_POINTS == PIPE_PRIM_POINTS);
 167    STATIC_ASSERT(GL_QUADS == PIPE_PRIM_QUADS);
 168    STATIC_ASSERT(GL_TRIANGLE_STRIP_ADJACENCY == PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY);
 169
 170    /* Avoid quadstrips if it's easy to do so:
 171     * Note: it's important to do the correct trimming if we change the
 172     * prim type!  We do that wherever this function is called.
 173     */
 174    if (prim == GL_QUAD_STRIP &&
 175        ctx->Light.ShadeModel != GL_FLAT &&
 176        ctx->Polygon.FrontMode == GL_FILL &&
 177        ctx->Polygon.BackMode == GL_FILL)
 178       prim = GL_TRIANGLE_STRIP;
 179
 180    return prim;
 181 }
 182
 183
 184 /**
 185  * This function gets plugged into the VBO module and is called when
 186  * we have something to render.
 187  * Basically, translate the information into the format expected by gallium.
 188  */
 189 void
 190 st_draw_vbo(struct gl_context *ctx,
 191             const struct _mesa_prim *prims,
 192             GLuint nr_prims,
 193             const struct _mesa_index_buffer *ib,
 194             GLboolean index_bounds_valid,
 195             GLuint min_index,
 196             GLuint max_index,
 197             struct gl_transform_feedback_object *tfb_vertcount)
 198 {
 199    struct st_context *st = st_context(ctx);
 200    struct pipe_index_buffer ibuffer = {0};
 201    struct pipe_draw_info info;
 202    const struct gl_client_array **arrays = ctx->Array._DrawArrays;
 203    unsigned i;
 204
 205    /* Mesa core state should have been validated already */
 206    assert(ctx->NewState == 0x0);
 207
 208    /* Validate state. */
 209    if (st->dirty.st || ctx->NewDriverState) {
 210       st_validate_state(st);
 211
 212       if (st->vertex_array_out_of_memory)
 213          return;
 214
 215 #if 0
 216       if (MESA_VERBOSE & VERBOSE_GLSL) {
 217          check_uniforms(ctx);
 218       }
 219 #else
 220       (void) check_uniforms;
 221 #endif
 222    }
 223
 224    util_draw_init_info(&info);
 225    if (ib) {
 226       /* Get index bounds for user buffers. */
 227       if (!index_bounds_valid)
 228          if (!all_varyings_in_vbos(arrays))
 229             vbo_get_minmax_indices(ctx, prims, ib, &min_index, &max_index,
 230                                    nr_prims);
 231
 232       if (!setup_index_buffer(st, ib, &ibuffer)) {
 233          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBegin/DrawElements/DrawArray");
 234          return;
 235       }
 236
 237       info.indexed = TRUE;
 238       if (min_index != ~0 && max_index != ~0) {
 239          info.min_index = min_index;
 240          info.max_index = max_index;
 241       }
 242
 243       /* The VBO module handles restart for the non-indexed GLDrawArrays
 244        * so we only set these fields for indexed drawing:
 245        */
 246       info.primitive_restart = ctx->Array._PrimitiveRestart;
 247       info.restart_index = ctx->Array.RestartIndex;
 248    }
 249    else {
 250       /* Transform feedback drawing is always non-indexed. */
 251       /* Set info.count_from_stream_output. */
 252       if (tfb_vertcount) {
 253          st_transform_feedback_draw_init(tfb_vertcount, &info);
 254       }
 255    }
 256
 257    /* do actual drawing */
 258    for (i = 0; i < nr_prims; i++) {
 259       info.mode = translate_prim( ctx, prims[i].mode );
 260       info.start = prims[i].start;
 261       info.count = prims[i].count;
 262       info.start_instance = prims[i].base_instance;
 263       info.instance_count = prims[i].num_instances;
 264       info.index_bias = prims[i].basevertex;
 265       if (!ib) {
 266          info.min_index = info.start;
 267          info.max_index = info.start + info.count - 1;
 268       }
 269
 270       if (ST_DEBUG & DEBUG_DRAW) {
 271          debug_printf("st/draw: mode %s  start %u  count %u  indexed %d\n",
 272                       u_prim_name(info.mode),
 273                       info.start,
 274                       info.count,
 275                       info.indexed);
 276       }
 277
 278       if (info.count_from_stream_output) {
 279          cso_draw_vbo(st->cso_context, &info);
 280       }
 281       else if (info.primitive_restart) {
 282          /* don't trim, restarts might be inside index list */
 283          cso_draw_vbo(st->cso_context, &info);
 284       }
 285       else if (u_trim_pipe_prim(prims[i].mode, &info.count))
 286          cso_draw_vbo(st->cso_context, &info);
 287    }
 288
 289    if (ib && st->indexbuf_uploader && !_mesa_is_bufferobj(ib->obj)) {
 290       pipe_resource_reference(&ibuffer.buffer, NULL);
 291    }
 292 }
 293
 294
 295 void
 296 st_init_draw(struct st_context *st)
 297 {
 298    struct gl_context *ctx = st->ctx;
 299
 300    vbo_set_draw_func(ctx, st_draw_vbo);
 301
 302    st->draw = draw_create(st->pipe); /* for selection/feedback */
 303
 304    /* Disable draw options that might convert points/lines to tris, etc.
 305     * as that would foul-up feedback/selection mode.
 306     */
 307    draw_wide_line_threshold(st->draw, 1000.0f);
 308    draw_wide_point_threshold(st->draw, 1000.0f);
 309    draw_enable_line_stipple(st->draw, FALSE);
 310    draw_enable_point_sprites(st->draw, FALSE);
 311 }
 312
 313
 314 void
 315 st_destroy_draw(struct st_context *st)
 316 {
 317    draw_destroy(st->draw);
 318 }