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      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 (at) 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 /**
     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          /* out of memory */
    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 (info.count_from_stream_output) {
    271          cso_draw_vbo(st->cso_context, &info);
    272       }
    273       else if (info.primitive_restart) {
    274          /* don't trim, restarts might be inside index list */
    275          cso_draw_vbo(st->cso_context, &info);
    276       }
    277       else if (u_trim_pipe_prim(info.mode, &info.count))
    278          cso_draw_vbo(st->cso_context, &info);
    279    }
    280 
    281    if (ib && st->indexbuf_uploader && !_mesa_is_bufferobj(ib->obj)) {
    282       pipe_resource_reference(&ibuffer.buffer, NULL);
    283    }
    284 }
    285 
    286 
    287 void
    288 st_init_draw(struct st_context *st)
    289 {
    290    struct gl_context *ctx = st->ctx;
    291 
    292    vbo_set_draw_func(ctx, st_draw_vbo);
    293 
    294 #if FEATURE_feedback || FEATURE_rastpos
    295    st->draw = draw_create(st->pipe); /* for selection/feedback */
    296 
    297    /* Disable draw options that might convert points/lines to tris, etc.
    298     * as that would foul-up feedback/selection mode.
    299     */
    300    draw_wide_line_threshold(st->draw, 1000.0f);
    301    draw_wide_point_threshold(st->draw, 1000.0f);
    302    draw_enable_line_stipple(st->draw, FALSE);
    303    draw_enable_point_sprites(st->draw, FALSE);
    304 #endif
    305 }
    306 
    307 
    308 void
    309 st_destroy_draw(struct st_context *st)
    310 {
    311 #if FEATURE_feedback || FEATURE_rastpos
    312    draw_destroy(st->draw);
    313 #endif
    314 }
    315