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// Copyright 2021 Benjamin Barenblat
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
// Vertex array objects.
#ifndef GLPLANET_SRC_GL_VERTEX_ARRAY_H_
#define GLPLANET_SRC_GL_VERTEX_ARRAY_H_
#include <stdint.h>
#include <utility>
#include "src/gl/buffer.h"
#include "src/gl/error.h"
#include "third_party/abseil/absl/types/optional.h"
#include "third_party/glew/include/GL/glew.h"
namespace gl {
enum class VertexAttributeType : GLenum {
kByte = GL_BYTE,
kShort = GL_SHORT,
kInt = GL_INT,
kFixed = GL_FIXED,
kFloat = GL_FLOAT,
kHalfFloat = GL_HALF_FLOAT,
kDouble = GL_DOUBLE,
kUnsignedByte = GL_UNSIGNED_BYTE,
kUnsignedShort = GL_UNSIGNED_SHORT,
kUnsignedInt = GL_UNSIGNED_INT,
kInt2x10x10x10Rev = GL_INT_2_10_10_10_REV,
kUnsignedInt2x10x10x10Rev = GL_UNSIGNED_INT_2_10_10_10_REV,
kUnsignedInt10f11f11fRev = GL_UNSIGNED_INT_10F_11F_11F_REV,
};
// A VAO.
class VertexArray final {
public:
explicit VertexArray() noexcept(!(gl_internal::kThreadSafetyChecks ||
gl_internal::kAggressiveErrorChecking)) {
gl_internal::CheckThreadSafety();
glCreateVertexArrays(1, &array_);
gl_internal::UnnecessaryErrorCheck();
}
VertexArray(VertexArray&&) noexcept = default;
VertexArray& operator=(VertexArray&&) noexcept = default;
~VertexArray() noexcept(!(gl_internal::kThreadSafetyChecks ||
gl_internal::kAggressiveErrorChecking)) {
gl_internal::CheckThreadSafety();
glDeleteVertexArrays(1, &array_);
gl_internal::UnnecessaryErrorCheck();
}
// Attaches the specified vertex buffer to the VAO.
void SetVertexBuffer(VertexBuffer vertices) {
gl_internal::CheckThreadSafety();
glVertexArrayVertexBuffer(array_, /*bindingindex=*/0, vertices.id(),
/*offset=*/0, vertices.element_size());
// This error check is necessary because the elements of the VBO might be
// too large for the implementation to handle.
gl_internal::ErrorCheck();
vertices_ = std::move(vertices);
}
// Specifies the organization of data in the attached VAO.
void SetVertexAttributeFormat(int index, int size, VertexAttributeType type,
int offset, bool normalized = false);
// Attaches the specified element buffer to the VAO. The element buffer must
// outlive this VAO.
void SetElementBuffer(ElementBuffer elements) noexcept(
!(gl_internal::kThreadSafetyChecks ||
gl_internal::kAggressiveErrorChecking)) {
gl_internal::CheckThreadSafety();
glVertexArrayElementBuffer(array_, elements.id());
gl_internal::UnnecessaryErrorCheck();
elements_ = std::move(elements);
}
// Returns the element buffer attached to this VAO.
const ElementBuffer& element_buffer() const noexcept { return elements_; }
// The GL identifier for this VAO.
unsigned int id() const noexcept { return array_; }
private:
GLuint array_;
VertexBuffer vertices_;
ElementBuffer elements_;
};
} // namespace gl
#endif // GLPLANET_SRC_GL_VERTEX_ARRAY_H_
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