void RenderContext::create() {
if(s_primedContext || s_creationLock) {
logThrowGL("[RenderContext] You cannot create a RenderContext while "
"another is primed or being created!");
}
s_creationLock = true;
// context needs to be current to call glewInit
makeCurrent();
// glewExperimental to use context versions above 3.2
// TODO: call glewInit just once (???)
glewExperimental = GL_TRUE;
GLenum status = glewInit();
// check for errors
if(status != GLEW_OK) {
logThrowGL("[RenderContext] glewInit() failed with status <", status, ">!");
}
// check for GL error (glew often causes one when using new context versions)
auto err = glGetError();
if(err != GL_NO_ERROR) {
logNotice("[RenderContext] glewInit() caused an openGL error <",
translateGLError(err), ">.");
}
// configure context
configure();
// reset state
resetCurrent();
s_creationLock = false;
m_wasCreated = true;
}
GLTexture::GLTexture(GLenum target)
: target(target)
{
glGenTextures(1, &name);
if (!name)
panic("Unable to allocate GL texture: glGenTextures() failed: " + translateGLError(glGetError()));
}
std::shared_ptr<GLTexture> GLTexture::create2d(
GLenum internalFormat,
FilterRule filterRule,
EdgeRule edgeRule,
PixelImage &image)
{
auto that = std::shared_ptr<GLTexture>(new GLTexture(GL_TEXTURE_2D));
that->bind();
glTexParameteri(that->target, GL_TEXTURE_MIN_FILTER, filterRule.minFilter);
glTexParameteri(that->target, GL_TEXTURE_MAG_FILTER, filterRule.magFilter);
glTexParameteri(that->target, GL_TEXTURE_WRAP_S, edgeRule.edgeX);
glTexParameteri(that->target, GL_TEXTURE_WRAP_T, edgeRule.edgeY);
glTexParameteri(that->target, GL_TEXTURE_WRAP_R, edgeRule.edgeZ);
GLenum imageFormat;
GLenum imageUnitType;
switch (image.getFormat()) {
case PixelImage::Format::RGB:
imageFormat = GL_RGB;
imageUnitType = GL_UNSIGNED_BYTE;
break;
case PixelImage::Format::RGBA:
imageFormat = GL_RGBA;
imageUnitType = GL_UNSIGNED_BYTE;
break;
default:
complain("Unrecognized/unsupported pixel image format");
return nullptr;
}
glTexImage2D(GL_TEXTURE_2D,
0, internalFormat,
image.getWidth(), image.getHeight(), 0,
imageFormat, imageUnitType, image.getData());
GLenum err = glGetError();
if (err) {
complain("Error creating texture from pixel image: glTexImage2D() failed: " + translateGLError(err));
return nullptr;
}
return that;
}
GLRenderBuffer::GLRenderBuffer()
{
glGenRenderbuffers(1, &name);
if (!name)
panic("Unable to create a GL renderbuffer: glGenRenderbuffers() failed: " + translateGLError(glGetError()));
}
