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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/output/static_geometry_binding.h"
#include <stddef.h>
#include <stdint.h>
#include "gpu/command_buffer/client/gles2_interface.h"
#include "ui/gfx/geometry/rect_f.h"
namespace cc {
StaticGeometryBinding::StaticGeometryBinding(gpu::gles2::GLES2Interface* gl,
const gfx::RectF& quad_vertex_rect)
: gl_(gl), quad_vertices_vbo_(0), quad_elements_vbo_(0) {
GeometryBindingQuad quads[NUM_QUADS];
GeometryBindingQuadIndex quad_indices[NUM_QUADS];
static_assert(sizeof(GeometryBindingQuad) == 24 * sizeof(float),
"struct Quad should be densely packed");
static_assert(sizeof(GeometryBindingQuadIndex) == 6 * sizeof(uint16_t),
"struct QuadIndex should be densely packed");
for (size_t i = 0; i < NUM_QUADS; i++) {
GeometryBindingVertex v0 = {
{quad_vertex_rect.x(), quad_vertex_rect.bottom(), 0.0f},
{0.0f, 1.0f},
i * 4.0f + 0.0f};
GeometryBindingVertex v1 = {
{quad_vertex_rect.x(), quad_vertex_rect.y(), 0.0f},
{0.0f, 0.0f},
i * 4.0f + 1.0f};
GeometryBindingVertex v2 = {
{quad_vertex_rect.right(), quad_vertex_rect.y(), 0.0f},
{1.0f, 0.0f},
i * 4.0f + 2.0f};
GeometryBindingVertex v3 = {
{quad_vertex_rect.right(), quad_vertex_rect.bottom(), 0.0f},
{1.0f, 1.0f},
i * 4.0f + 3.0f};
GeometryBindingQuad x(v0, v1, v2, v3);
quads[i] = x;
GeometryBindingQuadIndex y(
static_cast<uint16_t>(0 + 4 * i), static_cast<uint16_t>(1 + 4 * i),
static_cast<uint16_t>(2 + 4 * i), static_cast<uint16_t>(3 + 4 * i),
static_cast<uint16_t>(0 + 4 * i), static_cast<uint16_t>(2 + 4 * i));
quad_indices[i] = y;
}
gl_->GenBuffers(1, &quad_vertices_vbo_);
gl_->GenBuffers(1, &quad_elements_vbo_);
gl_->BindBuffer(GL_ARRAY_BUFFER, quad_vertices_vbo_);
gl_->BufferData(GL_ARRAY_BUFFER, sizeof(GeometryBindingQuad) * NUM_QUADS,
quads, GL_STATIC_DRAW);
gl_->BindBuffer(GL_ELEMENT_ARRAY_BUFFER, quad_elements_vbo_);
gl_->BufferData(GL_ELEMENT_ARRAY_BUFFER,
sizeof(GeometryBindingQuadIndex) * NUM_QUADS, &quad_indices,
GL_STATIC_DRAW);
}
StaticGeometryBinding::~StaticGeometryBinding() {
gl_->DeleteBuffers(1, &quad_vertices_vbo_);
gl_->DeleteBuffers(1, &quad_elements_vbo_);
}
void StaticGeometryBinding::PrepareForDraw() {
SetupGLContext(gl_, quad_elements_vbo_, quad_vertices_vbo_);
}
} // namespace cc
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