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/*
* Copyright 2016 Google Inc. All Rights Reserved.
*
* 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
*
* http://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.
*/
#ifndef GLIMP_GLES_BLEND_STATE_H_
#define GLIMP_GLES_BLEND_STATE_H_
namespace glimp {
namespace gles {
// Describes GL blend state, which can be modified via commands like
// glBlendFunc().
// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glBlendFunc.xml
struct BlendState {
enum Factor {
kFactorZero,
kFactorOne,
kFactorSrcColor,
kFactorOneMinusSrcColor,
kFactorDstColor,
kFactorOneMinusDstColor,
kFactorSrcAlpha,
kFactorOneMinusSrcAlpha,
kFactorDstAlpha,
kFactorOneMinusDstAlpha,
kFactorConstantColor,
kFactorOneMinusConstantColor,
kFactorConstantAlpha,
kFactorOneMinusConstantAlpha,
kFactorSrcAlphaSaturate,
kFactorInvalid,
};
// https://www.khronos.org/registry/OpenGL-Refpages/es2.0/xhtml/glBlendEquation.xml
enum Equation {
kEquationFuncAdd,
kEquationFuncSubtract,
kEquationFuncReverseSubtract,
kEquationFuncInvalid,
};
// Setup the blend state with initial values specified by the specification.
// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glBlendFunc.xml
BlendState()
: src_factor(kFactorOne),
dst_factor(kFactorZero),
enabled(false),
equation(kEquationFuncAdd) {}
Factor src_factor;
Factor dst_factor;
Equation equation;
bool enabled;
};
} // namespace gles
} // namespace glimp
#endif // GLIMP_GLES_BLEND_STATE_H_