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 #include "main/mfeatures.h"
  44
  45 #include "vbo/vbo.h"
  46
  47 #include "st_context.h"
  48 #include "st_atom.h"
  49 #include "st_cb_bufferobjects.h"
  50 #include "st_cb_xformfb.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 static void
  87 setup_index_buffer(struct st_context *st,
  88                    const struct _mesa_index_buffer *ib,
  89                    struct pipe_index_buffer *ibuffer)
  90 {
  91    struct gl_buffer_object *bufobj = ib->obj;
  92
  93    ibuffer->index_size = vbo_sizeof_ib_type(ib->type);
  94
  95    /* get/create the index buffer object */
  96    if (_mesa_is_bufferobj(bufobj)) {
  97       /* indices are in a real VBO */
  98       ibuffer->buffer = st_buffer_object(bufobj)->buffer;
  99       ibuffer->offset = pointer_to_offset(ib->ptr);
 100    }
 101    else if (st->indexbuf_uploader) {
 102       u_upload_data(st->indexbuf_uploader, 0, ib->count * ibuffer->index_size,
 103                     ib->ptr, &ibuffer->offset, &ibuffer->buffer);
 104       u_upload_unmap(st->indexbuf_uploader);
 105    }
 106    else {
 107       /* indices are in user space memory */
 108       ibuffer->user_buffer = ib->ptr;
 109    }
 110
 111    cso_set_index_buffer(st->cso_context, ibuffer);
 112 }
 113
 114
 115 /**
 116  * Prior to drawing, check that any uniforms referenced by the
 117  * current shader have been set.  If a uniform has not been set,
 118  * issue a warning.
 119  */
 120 static void
 121 check_uniforms(struct gl_context *ctx)
 122 {
 123    struct gl_shader_program *shProg[3] = {
 124       ctx->Shader.CurrentVertexProgram,
 125       ctx->Shader.CurrentGeometryProgram,
 126       ctx->Shader.CurrentFragmentProgram,
 127    };
 128    unsigned j;
 129
 130    for (j = 0; j < 3; j++) {
 131       unsigned i;
 132
 133       if (shProg[j] == NULL || !shProg[j]->LinkStatus)
 134          continue;
 135
 136       for (i = 0; i < shProg[j]->NumUserUniformStorage; i++) {
 137          const struct gl_uniform_storage *u = &shProg[j]->UniformStorage[i];
 138          if (!u->initialized) {
 139             _mesa_warning(ctx,
 140                           "Using shader with uninitialized uniform: %s",
 141                           u->name);
 142          }
 143       }
 144    }
 145 }
 146
 147
 148 /**
 149  * Translate OpenGL primtive type (GL_POINTS, GL_TRIANGLE_STRIP, etc) to
 150  * the corresponding Gallium type.
 151  */
 152 static unsigned
 153 translate_prim(const struct gl_context *ctx, unsigned prim)
 154 {
 155    /* GL prims should match Gallium prims, spot-check a few */
 156    STATIC_ASSERT(GL_POINTS == PIPE_PRIM_POINTS);
 157    STATIC_ASSERT(GL_QUADS == PIPE_PRIM_QUADS);
 158    STATIC_ASSERT(GL_TRIANGLE_STRIP_ADJACENCY == PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY);
 159
 160    /* Avoid quadstrips if it's easy to do so:
 161     * Note: it's important to do the correct trimming if we change the
 162     * prim type!  We do that wherever this function is called.
 163     */
 164    if (prim == GL_QUAD_STRIP &&
 165        ctx->Light.ShadeModel != GL_FLAT &&
 166        ctx->Polygon.FrontMode == GL_FILL &&
 167        ctx->Polygon.BackMode == GL_FILL)
 168       prim = GL_TRIANGLE_STRIP;
 169
 170    return prim;
 171 }
 172
 173
 174 /**
 175  * This function gets plugged into the VBO module and is called when
 176  * we have something to render.
 177  * Basically, translate the information into the format expected by gallium.
 178  */
 179 void
 180 st_draw_vbo(struct gl_context *ctx,
 181             const struct _mesa_prim *prims,
 182             GLuint nr_prims,
 183             const struct _mesa_index_buffer *ib,
 184             GLboolean index_bounds_valid,
 185             GLuint min_index,
 186             GLuint max_index,
 187             struct gl_transform_feedback_object *tfb_vertcount)
 188 {
 189    struct st_context *st = st_context(ctx);
 190    struct pipe_index_buffer ibuffer = {0};
 191    struct pipe_draw_info info;
 192    const struct gl_client_array **arrays = ctx->Array._DrawArrays;
 193    unsigned i;
 194
 195    /* Mesa core state should have been validated already */
 196    assert(ctx->NewState == 0x0);
 197
 198    /* Validate state. */
 199    if (st->dirty.st || ctx->NewDriverState) {
 200       st_validate_state(st);
 201
 202       if (st->vertex_array_out_of_memory)
 203          return;
 204
 205 #if 0
 206       if (MESA_VERBOSE & VERBOSE_GLSL) {
 207          check_uniforms(ctx);
 208       }
 209 #else
 210       (void) check_uniforms;
 211 #endif
 212    }
 213
 214    util_draw_init_info(&info);
 215    if (ib) {
 216       /* Get index bounds for user buffers. */
 217       if (!index_bounds_valid)
 218          if (!all_varyings_in_vbos(arrays))
 219             vbo_get_minmax_indices(ctx, prims, ib, &min_index, &max_index,
 220                                    nr_prims);
 221
 222       setup_index_buffer(st, ib, &ibuffer);
 223
 224       info.indexed = TRUE;
 225       if (min_index != ~0 && max_index != ~0) {
 226          info.min_index = min_index;
 227          info.max_index = max_index;
 228       }
 229
 230       /* The VBO module handles restart for the non-indexed GLDrawArrays
 231        * so we only set these fields for indexed drawing:
 232        */
 233       info.primitive_restart = ctx->Array._PrimitiveRestart;
 234       info.restart_index = ctx->Array._RestartIndex;
 235    }
 236    else {
 237       /* Transform feedback drawing is always non-indexed. */
 238       /* Set info.count_from_stream_output. */
 239       if (tfb_vertcount) {
 240          st_transform_feedback_draw_init(tfb_vertcount, &info);
 241       }
 242    }
 243
 244    /* do actual drawing */
 245    for (i = 0; i < nr_prims; i++) {
 246       info.mode = translate_prim( ctx, prims[i].mode );
 247       info.start = prims[i].start;
 248       info.count = prims[i].count;
 249       info.start_instance = prims[i].base_instance;
 250       info.instance_count = prims[i].num_instances;
 251       info.index_bias = prims[i].basevertex;
 252       if (!ib) {
 253          info.min_index = info.start;
 254          info.max_index = info.start + info.count - 1;
 255       }
 256
 257       if (info.count_from_stream_output) {
 258          cso_draw_vbo(st->cso_context, &info);
 259       }
 260       else if (info.primitive_restart) {
 261          /* don't trim, restarts might be inside index list */
 262          cso_draw_vbo(st->cso_context, &info);
 263       }
 264       else if (u_trim_pipe_prim(info.mode, &info.count))
 265          cso_draw_vbo(st->cso_context, &info);
 266    }
 267
 268    if (ib && st->indexbuf_uploader && !_mesa_is_bufferobj(ib->obj)) {
 269       pipe_resource_reference(&ibuffer.buffer, NULL);
 270    }
 271 }
 272
 273
 274 void
 275 st_init_draw(struct st_context *st)
 276 {
 277    struct gl_context *ctx = st->ctx;
 278
 279    vbo_set_draw_func(ctx, st_draw_vbo);
 280
 281    st->draw = draw_create(st->pipe); /* for selection/feedback */
 282
 283    /* Disable draw options that might convert points/lines to tris, etc.
 284     * as that would foul-up feedback/selection mode.
 285     */
 286    draw_wide_line_threshold(st->draw, 1000.0f);
 287    draw_wide_point_threshold(st->draw, 1000.0f);
 288    draw_enable_line_stipple(st->draw, FALSE);
 289    draw_enable_point_sprites(st->draw, FALSE);
 290 }
 291
 292
 293 void
 294 st_destroy_draw(struct st_context *st)
 295 {
 296    draw_destroy(st->draw);
 297 }