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      1 /**************************************************************************
      2  *
      3  * Copyright 2008 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 #include "pipe/p_context.h"
     30 #include "pipe/p_defines.h"
     31 #include "util/u_inlines.h"
     32 #include "util/u_draw_quad.h"
     33 #include "util/u_memory.h"
     34 #include "cso_cache/cso_context.h"
     35 
     36 
     37 /**
     38  * Draw a simple vertex buffer / primitive.
     39  * Limited to float[4] vertex attribs, tightly packed.
     40  */
     41 void
     42 util_draw_vertex_buffer(struct pipe_context *pipe,
     43                         struct cso_context *cso,
     44                         struct pipe_resource *vbuf,
     45                         uint offset,
     46                         uint prim_type,
     47                         uint num_verts,
     48                         uint num_attribs)
     49 {
     50    struct pipe_vertex_buffer vbuffer;
     51 
     52    assert(num_attribs <= PIPE_MAX_ATTRIBS);
     53 
     54    /* tell pipe about the vertex buffer */
     55    memset(&vbuffer, 0, sizeof(vbuffer));
     56    vbuffer.buffer = vbuf;
     57    vbuffer.stride = num_attribs * 4 * sizeof(float);  /* vertex size */
     58    vbuffer.buffer_offset = offset;
     59 
     60    /* note: vertex elements already set by caller */
     61 
     62    if (cso) {
     63       cso_set_vertex_buffers(cso, 1, &vbuffer);
     64       cso_draw_arrays(cso, prim_type, 0, num_verts);
     65    } else {
     66       pipe->set_vertex_buffers(pipe, 1, &vbuffer);
     67       util_draw_arrays(pipe, prim_type, 0, num_verts);
     68    }
     69 }
     70 
     71 
     72 /**
     73  * Draw a simple vertex buffer / primitive.
     74  * Limited to float[4] vertex attribs, tightly packed.
     75  */
     76 void
     77 util_draw_user_vertex_buffer(struct cso_context *cso, void *buffer,
     78                              uint prim_type, uint num_verts, uint num_attribs)
     79 {
     80    struct pipe_vertex_buffer vbuffer = {0};
     81 
     82    assert(num_attribs <= PIPE_MAX_ATTRIBS);
     83 
     84    vbuffer.user_buffer = buffer;
     85    vbuffer.stride = num_attribs * 4 * sizeof(float);  /* vertex size */
     86 
     87    /* note: vertex elements already set by caller */
     88 
     89    cso_set_vertex_buffers(cso, 1, &vbuffer);
     90    cso_draw_arrays(cso, prim_type, 0, num_verts);
     91 }
     92 
     93 
     94 /**
     95  * Draw screen-aligned textured quad.
     96  * Note: this isn't especially efficient.
     97  */
     98 void
     99 util_draw_texquad(struct pipe_context *pipe, struct cso_context *cso,
    100                   float x0, float y0, float x1, float y1, float z)
    101 {
    102    uint numAttribs = 2, i, j;
    103    uint vertexBytes = 4 * (4 * numAttribs * sizeof(float));
    104    struct pipe_resource *vbuf = NULL;
    105    float *v = NULL;
    106 
    107    v = MALLOC(vertexBytes);
    108    if (v == NULL)
    109       goto out;
    110 
    111    /*
    112     * Load vertex buffer
    113     */
    114    for (i = j = 0; i < 4; i++) {
    115       v[j + 2] = z;   /* z */
    116       v[j + 3] = 1.0; /* w */
    117       v[j + 6] = 0.0; /* r */
    118       v[j + 7] = 1.0; /* q */
    119       j += 8;
    120    }
    121 
    122    v[0] = x0;
    123    v[1] = y0;
    124    v[4] = 0.0; /*s*/
    125    v[5] = 0.0; /*t*/
    126 
    127    v[8] = x1;
    128    v[9] = y0;
    129    v[12] = 1.0;
    130    v[13] = 0.0;
    131 
    132    v[16] = x1;
    133    v[17] = y1;
    134    v[20] = 1.0;
    135    v[21] = 1.0;
    136 
    137    v[24] = x0;
    138    v[25] = y1;
    139    v[28] = 0.0;
    140    v[29] = 1.0;
    141 
    142    vbuf = pipe_buffer_create(pipe->screen, PIPE_BIND_VERTEX_BUFFER,
    143                              PIPE_USAGE_STAGING, vertexBytes);
    144    if (!vbuf)
    145       goto out;
    146    pipe_buffer_write(pipe, vbuf, 0, vertexBytes, v);
    147 
    148    util_draw_vertex_buffer(pipe, cso, vbuf, 0, PIPE_PRIM_TRIANGLE_FAN, 4, 2);
    149 
    150 out:
    151    if (vbuf)
    152       pipe_resource_reference(&vbuf, NULL);
    153 
    154    if (v)
    155       FREE(v);
    156 }
    157