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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.
// OpenGL initialization.
#ifndef GLPLANET_SRC_GL_INIT_H_
#define GLPLANET_SRC_GL_INIT_H_
#include "src/gl/error.h"
#include "src/util.h"
#include "third_party/glew/include/GL/glew.h"
namespace gl {
// OpenGL capabilities
enum class Capability : GLenum {
kBlend = GL_BLEND,
kClipDistance0 = GL_CLIP_DISTANCE0,
kClipDistance1 = GL_CLIP_DISTANCE1,
kClipDistance2 = GL_CLIP_DISTANCE2,
kClipDistance3 = GL_CLIP_DISTANCE3,
kClipDistance4 = GL_CLIP_DISTANCE4,
kClipDistance5 = GL_CLIP_DISTANCE5,
kColorLogicOp = GL_COLOR_LOGIC_OP,
kCullFace = GL_CULL_FACE,
kDepthClamp = GL_DEPTH_CLAMP,
kDepthTest = GL_DEPTH_TEST,
kDither = GL_DITHER,
kFramebufferSrgb = GL_FRAMEBUFFER_SRGB,
kLineSmooth = GL_LINE_SMOOTH,
kMultisample = GL_MULTISAMPLE,
kPolygonOffsetFill = GL_POLYGON_OFFSET_FILL,
kPolygonOffsetLine = GL_POLYGON_OFFSET_LINE,
kPolygonOffsetPoint = GL_POLYGON_OFFSET_POINT,
kPolygonSmooth = GL_POLYGON_SMOOTH,
kRasterizerDiscard = GL_RASTERIZER_DISCARD,
kSampleAlphaToCoverage = GL_SAMPLE_ALPHA_TO_COVERAGE,
kSampleAlphaToOne = GL_SAMPLE_ALPHA_TO_ONE,
kSampleCoverage = GL_SAMPLE_COVERAGE,
kSampleShading = GL_SAMPLE_SHADING,
kSampleMask = GL_SAMPLE_MASK,
kScissorTest = GL_SCISSOR_TEST,
kStencilTest = GL_STENCIL_TEST,
kProgramPointSize = GL_PROGRAM_POINT_SIZE,
// Added in GL 3.1
kPrimitiveRestart = GL_PRIMITIVE_RESTART,
// Added in GL 3.2
kTextureCubeMapSeamless = GL_TEXTURE_CUBE_MAP_SEAMLESS,
};
// Initializes the OpenGL state machine in the current thread. The current
// thread must have an OpenGL context bound.
//
// You must call this function exactly once in your program. Once you do so, you
// may not call any other function in this namespace from any other thread.
void InitializeForThisThread();
// Enables the specified OpenGL capability.
inline void Enable(Capability cap) noexcept(
!(gl_internal::kThreadSafetyChecks ||
gl_internal::kAggressiveErrorChecking)) {
gl_internal::CheckThreadSafety();
glEnable(FromEnum(cap));
gl_internal::UnnecessaryErrorCheck();
}
// Sets the clear color for the active framebuffer. Color coordinates should be
// in the range [0, 1].
void SetClearColor(float red, float green, float blue, float alpha);
} // namespace gl
#endif // GLPLANET_SRC_GL_INIT_H_
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