reactos/dll/opengl/mesa/src/gallium/auxiliary/util/u_draw_quad.c

   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    if (cso) {
  61       cso_set_vertex_buffers(cso, 1, &vbuffer);
  62    } else {
  63       pipe->set_vertex_buffers(pipe, 1, &vbuffer);
  64    }
  65
  66    /* note: vertex elements already set by caller */
  67
  68    /* draw */
  69    util_draw_arrays(pipe, prim_type, 0, num_verts);
  70 }
  71
  72
  73
  74 /**
  75  * Draw screen-aligned textured quad.
  76  * Note: this isn't especially efficient.
  77  */
  78 void
  79 util_draw_texquad(struct pipe_context *pipe, struct cso_context *cso,
  80                   float x0, float y0, float x1, float y1, float z)
  81 {
  82    uint numAttribs = 2, i, j;
  83    uint vertexBytes = 4 * (4 * numAttribs * sizeof(float));
  84    struct pipe_resource *vbuf = NULL;
  85    float *v = NULL;
  86
  87    v = MALLOC(vertexBytes);
  88    if (v == NULL)
  89       goto out;
  90
  91    /*
  92     * Load vertex buffer
  93     */
  94    for (i = j = 0; i < 4; i++) {
  95       v[j + 2] = z;   /* z */
  96       v[j + 3] = 1.0; /* w */
  97       v[j + 6] = 0.0; /* r */
  98       v[j + 7] = 1.0; /* q */
  99       j += 8;
 100    }
 101
 102    v[0] = x0;
 103    v[1] = y0;
 104    v[4] = 0.0; /*s*/
 105    v[5] = 0.0; /*t*/
 106
 107    v[8] = x1;
 108    v[9] = y0;
 109    v[12] = 1.0;
 110    v[13] = 0.0;
 111
 112    v[16] = x1;
 113    v[17] = y1;
 114    v[20] = 1.0;
 115    v[21] = 1.0;
 116
 117    v[24] = x0;
 118    v[25] = y1;
 119    v[28] = 0.0;
 120    v[29] = 1.0;
 121
 122    vbuf = pipe_user_buffer_create(pipe->screen, v, vertexBytes,
 123                                   PIPE_BIND_VERTEX_BUFFER);
 124    if (!vbuf)
 125       goto out;
 126
 127    util_draw_vertex_buffer(pipe, cso, vbuf, 0, PIPE_PRIM_TRIANGLE_FAN, 4, 2);
 128
 129 out:
 130    if (vbuf)
 131       pipe_resource_reference(&vbuf, NULL);
 132
 133    if (v)
 134       FREE(v);
 135 }