mirror of
https://github.com/encounter/dawn-cmake.git
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97 lines
4.0 KiB
C++
97 lines
4.0 KiB
C++
// Copyright 2017 The Dawn Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "dawn_native/opengl/BlendStateGL.h"
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#include "common/Assert.h"
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namespace dawn_native { namespace opengl {
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namespace {
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GLenum GLBlendFactor(dawn::BlendFactor factor, bool alpha) {
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switch (factor) {
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case dawn::BlendFactor::Zero:
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return GL_ZERO;
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case dawn::BlendFactor::One:
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return GL_ONE;
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case dawn::BlendFactor::SrcColor:
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return GL_SRC_COLOR;
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case dawn::BlendFactor::OneMinusSrcColor:
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return GL_ONE_MINUS_SRC_COLOR;
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case dawn::BlendFactor::SrcAlpha:
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return GL_SRC_ALPHA;
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case dawn::BlendFactor::OneMinusSrcAlpha:
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return GL_ONE_MINUS_SRC_ALPHA;
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case dawn::BlendFactor::DstColor:
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return GL_DST_COLOR;
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case dawn::BlendFactor::OneMinusDstColor:
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return GL_ONE_MINUS_DST_COLOR;
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case dawn::BlendFactor::DstAlpha:
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return GL_DST_ALPHA;
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case dawn::BlendFactor::OneMinusDstAlpha:
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return GL_ONE_MINUS_DST_ALPHA;
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case dawn::BlendFactor::SrcAlphaSaturated:
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return GL_SRC_ALPHA_SATURATE;
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case dawn::BlendFactor::BlendColor:
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return alpha ? GL_CONSTANT_ALPHA : GL_CONSTANT_COLOR;
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case dawn::BlendFactor::OneMinusBlendColor:
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return alpha ? GL_ONE_MINUS_CONSTANT_ALPHA : GL_ONE_MINUS_CONSTANT_COLOR;
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default:
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UNREACHABLE();
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}
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}
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GLenum GLBlendMode(dawn::BlendOperation operation) {
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switch (operation) {
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case dawn::BlendOperation::Add:
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return GL_FUNC_ADD;
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case dawn::BlendOperation::Subtract:
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return GL_FUNC_SUBTRACT;
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case dawn::BlendOperation::ReverseSubtract:
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return GL_FUNC_REVERSE_SUBTRACT;
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case dawn::BlendOperation::Min:
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return GL_MIN;
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case dawn::BlendOperation::Max:
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return GL_MAX;
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default:
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UNREACHABLE();
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}
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}
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} // namespace
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BlendState::BlendState(BlendStateBuilder* builder) : BlendStateBase(builder) {
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}
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void BlendState::ApplyNow(uint32_t attachment) {
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const auto& info = GetBlendInfo();
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if (info.blendEnabled) {
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glEnablei(GL_BLEND, attachment);
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glBlendEquationSeparatei(attachment, GLBlendMode(info.colorBlend.operation),
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GLBlendMode(info.alphaBlend.operation));
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glBlendFuncSeparatei(attachment, GLBlendFactor(info.colorBlend.srcFactor, false),
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GLBlendFactor(info.colorBlend.dstFactor, false),
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GLBlendFactor(info.alphaBlend.srcFactor, true),
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GLBlendFactor(info.alphaBlend.dstFactor, true));
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} else {
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glDisablei(GL_BLEND, attachment);
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}
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glColorMaski(attachment, info.colorWriteMask & dawn::ColorWriteMask::Red,
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info.colorWriteMask & dawn::ColorWriteMask::Green,
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info.colorWriteMask & dawn::ColorWriteMask::Blue,
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info.colorWriteMask & dawn::ColorWriteMask::Alpha);
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}
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}} // namespace dawn_native::opengl
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