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       /* 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  */
 131 static void
 132 check_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  */
 163 static unsigned
 164 translate_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  */
 190 void
 191 st_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             struct gl_buffer_object *indirect)
 200 {
 201    struct st_context *st = st_context(ctx);
 202    struct pipe_index_buffer ibuffer = {0};
 203    struct pipe_draw_info info;
 204    const struct gl_client_array **arrays = ctx->Array._DrawArrays;
 205    unsigned i;
 206
 207    /* Mesa core state should have been validated already */
 208    assert(ctx->NewState == 0x0);
 209
 210    /* Validate state. */
 211    if (st->dirty.st || ctx->NewDriverState) {
 212       st_validate_state(st);
 213
 214 #if 0
 215       if (MESA_VERBOSE & VERBOSE_GLSL) {
 216          check_uniforms(ctx);
 217       }
 218 #else
 219       (void) check_uniforms;
 220 #endif
 221    }
 222
 223    if (st->vertex_array_out_of_memory) {
 224       return;
 225    }
 226
 227    util_draw_init_info(&info);
 228
 229    if (ib) {
 230       /* Get index bounds for user buffers. */
 231       if (!index_bounds_valid)
 232          if (!all_varyings_in_vbos(arrays))
 233             vbo_get_minmax_indices(ctx, prims, ib, &min_index, &max_index,
 234                                    nr_prims);
 235
 236       if (!setup_index_buffer(st, ib, &ibuffer)) {
 237          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBegin/DrawElements/DrawArray");
 238          return;
 239       }
 240
 241       info.indexed = TRUE;
 242       if (min_index != ~0 && max_index != ~0) {
 243          info.min_index = min_index;
 244          info.max_index = max_index;
 245       }
 246
 247       /* The VBO module handles restart for the non-indexed GLDrawArrays
 248        * so we only set these fields for indexed drawing:
 249        */
 250       info.primitive_restart = ctx->Array._PrimitiveRestart;
 251       info.restart_index = ctx->Array.RestartIndex;
 252    }
 253    else {
 254       /* Transform feedback drawing is always non-indexed. */
 255       /* Set info.count_from_stream_output. */
 256       if (tfb_vertcount) {
 257          st_transform_feedback_draw_init(tfb_vertcount, &info);
 258       }
 259    }
 260
 261    /* do actual drawing */
 262    for (i = 0; i < nr_prims; i++) {
 263       info.mode = translate_prim(ctx, prims[i].mode);
 264       info.start = prims[i].start;
 265       info.count = prims[i].count;
 266       info.start_instance = prims[i].base_instance;
 267       info.instance_count = prims[i].num_instances;
 268       info.index_bias = prims[i].basevertex;
 269       if (!ib) {
 270          info.min_index = info.start;
 271          info.max_index = info.start + info.count - 1;
 272       }
 273
 274       if (ST_DEBUG & DEBUG_DRAW) {
 275          debug_printf("st/draw: mode %s  start %u  count %u  indexed %d\n",
 276                       u_prim_name(info.mode),
 277                       info.start,
 278                       info.count,
 279                       info.indexed);
 280       }
 281
 282       if (info.count_from_stream_output) {
 283          cso_draw_vbo(st->cso_context, &info);
 284       }
 285       else if (info.primitive_restart) {
 286          /* don't trim, restarts might be inside index list */
 287          cso_draw_vbo(st->cso_context, &info);
 288       }
 289       else if (u_trim_pipe_prim(prims[i].mode, &info.count)) {
 290          cso_draw_vbo(st->cso_context, &info);
 291       }
 292    }
 293
 294    if (ib && st->indexbuf_uploader && !_mesa_is_bufferobj(ib->obj)) {
 295       pipe_resource_reference(&ibuffer.buffer, NULL);
 296    }
 297 }
 298
 299
 300 void
 301 st_init_draw(struct st_context *st)
 302 {
 303    struct gl_context *ctx = st->ctx;
 304
 305    vbo_set_draw_func(ctx, st_draw_vbo);
 306
 307    st->draw = draw_create(st->pipe); /* for selection/feedback */
 308
 309    /* Disable draw options that might convert points/lines to tris, etc.
 310     * as that would foul-up feedback/selection mode.
 311     */
 312    draw_wide_line_threshold(st->draw, 1000.0f);
 313    draw_wide_point_threshold(st->draw, 1000.0f);
 314    draw_enable_line_stipple(st->draw, FALSE);
 315    draw_enable_point_sprites(st->draw, FALSE);
 316 }
 317
 318
 319 void
 320 st_destroy_draw(struct st_context *st)
 321 {
 322    draw_destroy(st->draw);
 323 }