src/gallium/auxiliary/util/u_draw_quad.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 VMware, Inc.
   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 VMWARE 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 }