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1 // Copyright 2015 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/dynamic_geometry_binding.h" | |
6 | |
7 #include "cc/output/gl_renderer.h" // For the GLC() macro. | |
8 #include "gpu/command_buffer/client/gles2_interface.h" | |
9 #include "ui/gfx/geometry/rect_f.h" | |
10 | |
11 namespace cc { | |
12 | |
13 DynamicGeometryBinding::DynamicGeometryBinding(gpu::gles2::GLES2Interface* gl) | |
14 : gl_(gl), quad_vertices_vbo_(0), quad_elements_vbo_(0) { | |
15 GeometryBindingQuad quads[1]; | |
16 GeometryBindingQuadIndex quad_indices[1]; | |
17 | |
18 static_assert(sizeof(GeometryBindingQuad) == 24 * sizeof(float), | |
19 "struct Quad should be densely packed"); | |
20 static_assert(sizeof(GeometryBindingQuadIndex) == 6 * sizeof(uint16_t), | |
21 "struct QuadIndex should be densely packed"); | |
22 | |
23 GLC(gl_, gl_->GenBuffers(1, &quad_vertices_vbo_)); | |
24 GLC(gl_, gl_->GenBuffers(1, &quad_elements_vbo_)); | |
25 | |
26 GLC(gl_, gl_->BindBuffer(GL_ARRAY_BUFFER, quad_vertices_vbo_)); | |
27 GLC(gl_, gl_->BufferData(GL_ARRAY_BUFFER, sizeof(GeometryBindingQuad) * 1, | |
28 quads, GL_DYNAMIC_DRAW)); | |
29 | |
30 GLC(gl_, gl_->BindBuffer(GL_ELEMENT_ARRAY_BUFFER, quad_elements_vbo_)); | |
31 GLC(gl_, gl_->BufferData(GL_ELEMENT_ARRAY_BUFFER, | |
32 sizeof(GeometryBindingQuadIndex) * 1, &quad_indices, | |
33 GL_DYNAMIC_DRAW)); | |
34 } | |
35 | |
36 void DynamicGeometryBinding::InitializeCustomQuad(const gfx::QuadF& quad) { | |
37 float uv[] = {0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f}; | |
38 InitializeCustomQuadWithUVs(quad, uv); | |
39 } | |
40 | |
41 void DynamicGeometryBinding::InitializeCustomQuadWithUVs(const gfx::QuadF& quad, | |
42 const float uv[8]) { | |
43 GeometryBindingVertex v0 = { | |
44 {quad.p1().x(), quad.p1().y(), 0.0f}, {uv[0], uv[1]}, 0.0f}; | |
45 GeometryBindingVertex v1 = { | |
46 {quad.p2().x(), quad.p2().y(), 0.0f}, {uv[2], uv[3]}, 1.0f}; | |
47 GeometryBindingVertex v2 = { | |
48 {quad.p3().x(), quad.p3().y(), 0.0f}, {uv[4], uv[5]}, 2.0f}; | |
49 GeometryBindingVertex v3 = { | |
50 {quad.p4().x(), quad.p4().y(), 0.0f}, {uv[6], uv[7]}, 3.0f}; | |
51 | |
52 GeometryBindingQuad local_quad = {v0, v1, v2, v3}; | |
53 GeometryBindingQuadIndex quad_index( | |
54 static_cast<uint16>(0), static_cast<uint16>(1), static_cast<uint16>(2), | |
55 static_cast<uint16>(3), static_cast<uint16>(0), static_cast<uint16>(2)); | |
56 | |
57 GLC(gl_, gl_->BufferSubData(GL_ARRAY_BUFFER, 0, sizeof(GeometryBindingQuad), | |
58 &local_quad)); | |
59 GLC(gl_, gl_->BufferSubData(GL_ELEMENT_ARRAY_BUFFER, 0, | |
60 sizeof(GeometryBindingQuadIndex), &quad_index)); | |
61 } | |
62 | |
63 void DynamicGeometryBinding::PrepareForDraw() { | |
64 SetupGLContext(gl_, quad_elements_vbo_, quad_vertices_vbo_); | |
65 } | |
66 | |
67 } // namespace cc | |
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