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/* Copyright 2015-2018 Egor Yusov
*
* 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
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
*
* In no event and under no legal theory, whether in tort (including negligence),
* contract, or otherwise, unless required by applicable law (such as deliberate
* and grossly negligent acts) or agreed to in writing, shall any Contributor be
* liable for any damages, including any direct, indirect, special, incidental,
* or consequential damages of any character arising as a result of this License or
* out of the use or inability to use the software (including but not limited to damages
* for loss of goodwill, work stoppage, computer failure or malfunction, or any and
* all other commercial damages or losses), even if such Contributor has been advised
* of the possibility of such damages.
*/
#include "pch.h"
#include "GLContextLinux.hpp"
#include "GraphicsTypes.h"
#include "GLTypeConversions.hpp"
namespace Diligent
{
GLContext::GLContext(const EngineGLCreateInfo& InitAttribs, DeviceCaps& deviceCaps, const struct SwapChainDesc* /*pSCDesc*/) :
m_Context(0),
m_WindowId(InitAttribs.Window.WindowId),
m_pDisplay(InitAttribs.Window.pDisplay)
{
auto CurrentCtx = glXGetCurrentContext();
if (CurrentCtx == 0)
{
LOG_ERROR_AND_THROW("No current GL context found!");
}
// Initialize GLEW
GLenum err = glewInit();
if (GLEW_OK != err)
LOG_ERROR_AND_THROW("Failed to initialize GLEW");
//Checking GL version
const GLubyte* GLVersionString = glGetString(GL_VERSION);
const GLubyte* GLRenderer = glGetString(GL_RENDERER);
Int32 MajorVersion = 0, MinorVersion = 0;
//Or better yet, use the GL3 way to get the version number
glGetIntegerv(GL_MAJOR_VERSION, &MajorVersion);
glGetIntegerv(GL_MINOR_VERSION, &MinorVersion);
LOG_INFO_MESSAGE(InitAttribs.Window.WindowId != 0 ? "Initialized OpenGL " : "Attached to OpenGL ", MajorVersion, '.', MinorVersion, " context (", GLVersionString, ", ", GLRenderer, ')');
// Under the standard filtering rules for cubemaps, filtering does not work across faces of the cubemap.
// This results in a seam across the faces of a cubemap. This was a hardware limitation in the past, but
// modern hardware is capable of interpolating across a cube face boundary.
// GL_TEXTURE_CUBE_MAP_SEAMLESS is not defined in OpenGLES
glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
if (glGetError() != GL_NO_ERROR)
LOG_ERROR_MESSAGE("Failed to enable seamless cubemap filtering");
// When GL_FRAMEBUFFER_SRGB is enabled, and if the destination image is in the sRGB colorspace
// then OpenGL will assume the shader's output is in the linear RGB colorspace. It will therefore
// convert the output from linear RGB to sRGB.
// Any writes to images that are not in the sRGB format should not be affected.
// Thus this setting should be just set once and left that way
glEnable(GL_FRAMEBUFFER_SRGB);
if (glGetError() != GL_NO_ERROR)
LOG_ERROR_MESSAGE("Failed to enable SRGB framebuffers");
deviceCaps.DevType = RENDER_DEVICE_TYPE_GL;
deviceCaps.MajorVersion = MajorVersion;
deviceCaps.MinorVersion = MinorVersion;
}
GLContext::~GLContext()
{
}
void GLContext::SwapBuffers(int SwapInterval)
{
if (m_WindowId != 0 && m_pDisplay != nullptr)
{
auto wnd = static_cast<Window>(m_WindowId);
auto display = reinterpret_cast<Display*>(m_pDisplay);
#if GLX_EXT_swap_control
if (glXSwapIntervalEXT != nullptr)
{
glXSwapIntervalEXT(display, wnd, SwapInterval);
}
# if GLX_MESA_swap_control
else if (glXSwapIntervalMESA != nullptr)
{
glXSwapIntervalMESA(SwapInterval);
}
# endif
#endif
glXSwapBuffers(display, wnd);
}
else
{
LOG_ERROR("Swap buffer failed because window and/or display handle is not initialized");
}
}
GLContext::NativeGLContextType GLContext::GetCurrentNativeGLContext()
{
return glXGetCurrentContext();
}
} // namespace Diligent
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