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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 vbuf_slot,
  46.                         uint offset,
  47.                         uint prim_type,
  48.                         uint num_verts,
  49.                         uint num_attribs)
  50. {
  51.    struct pipe_vertex_buffer vbuffer;
  52.  
  53.    assert(num_attribs <= PIPE_MAX_ATTRIBS);
  54.  
  55.    /* tell pipe about the vertex buffer */
  56.    memset(&vbuffer, 0, sizeof(vbuffer));
  57.    vbuffer.buffer = vbuf;
  58.    vbuffer.stride = num_attribs * 4 * sizeof(float);  /* vertex size */
  59.    vbuffer.buffer_offset = offset;
  60.  
  61.    /* note: vertex elements already set by caller */
  62.  
  63.    if (cso) {
  64.       cso_set_vertex_buffers(cso, vbuf_slot, 1, &vbuffer);
  65.       cso_draw_arrays(cso, prim_type, 0, num_verts);
  66.    } else {
  67.       pipe->set_vertex_buffers(pipe, vbuf_slot, 1, &vbuffer);
  68.       util_draw_arrays(pipe, prim_type, 0, num_verts);
  69.    }
  70. }
  71.  
  72.  
  73. /**
  74.  * Draw a simple vertex buffer / primitive.
  75.  * Limited to float[4] vertex attribs, tightly packed.
  76.  */
  77. void
  78. util_draw_user_vertex_buffer(struct cso_context *cso, void *buffer,
  79.                              uint prim_type, uint num_verts, uint num_attribs)
  80. {
  81.    struct pipe_vertex_buffer vbuffer = {0};
  82.  
  83.    assert(num_attribs <= PIPE_MAX_ATTRIBS);
  84.  
  85.    vbuffer.user_buffer = buffer;
  86.    vbuffer.stride = num_attribs * 4 * sizeof(float);  /* vertex size */
  87.  
  88.    /* note: vertex elements already set by caller */
  89.  
  90.    cso_set_vertex_buffers(cso, 0, 1, &vbuffer);
  91.    cso_draw_arrays(cso, prim_type, 0, num_verts);
  92. }
  93.  
  94.  
  95. /**
  96.  * Draw screen-aligned textured quad.
  97.  * Note: this isn't especially efficient.
  98.  */
  99. void
  100. util_draw_texquad(struct pipe_context *pipe, struct cso_context *cso,
  101.                   uint vbuf_slot,
  102.                   float x0, float y0, float x1, float y1, float z)
  103. {
  104.    uint numAttribs = 2, i, j;
  105.    uint vertexBytes = 4 * (4 * numAttribs * sizeof(float));
  106.    struct pipe_resource *vbuf = NULL;  
  107.    float *v = NULL;
  108.  
  109.    v = MALLOC(vertexBytes);
  110.    if (v == NULL)
  111.       goto out;
  112.  
  113.    /*
  114.     * Load vertex buffer
  115.     */
  116.    for (i = j = 0; i < 4; i++) {
  117.       v[j + 2] = z;   /* z */
  118.       v[j + 3] = 1.0; /* w */
  119.       v[j + 6] = 0.0; /* r */
  120.       v[j + 7] = 1.0; /* q */
  121.       j += 8;
  122.    }
  123.  
  124.    v[0] = x0;
  125.    v[1] = y0;
  126.    v[4] = 0.0; /*s*/
  127.    v[5] = 0.0; /*t*/
  128.  
  129.    v[8] = x1;
  130.    v[9] = y0;
  131.    v[12] = 1.0;
  132.    v[13] = 0.0;
  133.  
  134.    v[16] = x1;
  135.    v[17] = y1;
  136.    v[20] = 1.0;
  137.    v[21] = 1.0;
  138.  
  139.    v[24] = x0;
  140.    v[25] = y1;
  141.    v[28] = 0.0;
  142.    v[29] = 1.0;
  143.          
  144.    vbuf = pipe_buffer_create(pipe->screen, PIPE_BIND_VERTEX_BUFFER,
  145.                              PIPE_USAGE_STAGING, vertexBytes);
  146.    if (!vbuf)
  147.       goto out;
  148.    pipe_buffer_write(pipe, vbuf, 0, vertexBytes, v);
  149.  
  150.    util_draw_vertex_buffer(pipe, cso, vbuf, vbuf_slot, 0,
  151.                            PIPE_PRIM_TRIANGLE_FAN, 4, 2);
  152.  
  153. out:
  154.    if (vbuf)
  155.       pipe_resource_reference(&vbuf, NULL);
  156.    
  157.    FREE(v);
  158. }
  159.