cc/output/geometry_binding.cc

   1 // Copyright 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/output/geometry_binding.h"
   6
   7 #include "gpu/command_buffer/client/gles2_interface.h"
   8 #include "ui/gfx/geometry/rect_f.h"
   9
  10 namespace cc {
  11
  12 void SetupGLContext(gpu::gles2::GLES2Interface* gl,
  13                     GLuint quad_elements_vbo,
  14                     GLuint quad_vertices_vbo) {
  15   gl->BindBuffer(GL_ELEMENT_ARRAY_BUFFER, quad_elements_vbo);
  16
  17   gl->BindBuffer(GL_ARRAY_BUFFER, quad_vertices_vbo);
  18   // OpenGL defines the last parameter to VertexAttribPointer as type
  19   // "const GLvoid*" even though it is actually an offset into the buffer
  20   // object's data store and not a pointer to the client's address space.
  21   const void* offsets[3] = {
  22       0,
  23       reinterpret_cast<const void*>(3 * sizeof(float)),
  24       reinterpret_cast<const void*>(5 * sizeof(float)),
  25   };
  26
  27   gl->VertexAttribPointer(GeometryBinding::PositionAttribLocation(), 3,
  28                           GL_FLOAT, false, 6 * sizeof(float), offsets[0]);
  29   gl->VertexAttribPointer(GeometryBinding::TexCoordAttribLocation(), 2,
  30                           GL_FLOAT, false, 6 * sizeof(float), offsets[1]);
  31   gl->VertexAttribPointer(GeometryBinding::TriangleIndexAttribLocation(), 1,
  32                           GL_FLOAT, false, 6 * sizeof(float), offsets[2]);
  33   gl->EnableVertexAttribArray(GeometryBinding::PositionAttribLocation());
  34   gl->EnableVertexAttribArray(GeometryBinding::TexCoordAttribLocation());
  35   gl->EnableVertexAttribArray(GeometryBinding::TriangleIndexAttribLocation());
  36 }
  37
  38 GeometryBindingQuad::GeometryBindingQuad() {
  39   v0 = {{0, 0, 0}, {0, 0}, 0};
  40   v1 = {{0, 0, 0}, {0, 0}, 0};
  41   v2 = {{0, 0, 0}, {0, 0}, 0};
  42   v3 = {{0, 0, 0}, {0, 0}, 0};
  43 }
  44
  45 GeometryBindingQuad::GeometryBindingQuad(const GeometryBindingVertex& vert0,
  46                                          const GeometryBindingVertex& vert1,
  47                                          const GeometryBindingVertex& vert2,
  48                                          const GeometryBindingVertex& vert3) {
  49   v0 = vert0;
  50   v1 = vert1;
  51   v2 = vert2;
  52   v3 = vert3;
  53 }
  54
  55 GeometryBindingQuadIndex::GeometryBindingQuadIndex() {
  56   memset(data, 0x0, sizeof(data));
  57 }
  58
  59 GeometryBindingQuadIndex::GeometryBindingQuadIndex(uint16 index0,
  60                                                    uint16 index1,
  61                                                    uint16 index2,
  62                                                    uint16 index3,
  63                                                    uint16 index4,
  64                                                    uint16 index5) {
  65   data[0] = index0;
  66   data[1] = index1;
  67   data[2] = index2;
  68   data[3] = index3;
  69   data[4] = index4;
  70   data[5] = index5;
  71 }
  72
  73 }  // namespace cc