Program createProgram(const std::vector<GLuint> &shaders) {
Program program(glCreateProgram());
if (!program) {
throw OpenGLException("Program creation failed", glGetError());
}
for (GLuint shader : shaders) {
glAttachShader(program.get(), shader);
GLenum error = glGetError();
if (error != GL_NO_ERROR) {
throw OpenGLException("Shader attachment failed", error);
}
}
glLinkProgram(program.get());
GLint infoLogLength;
glGetProgramiv(program.get(), GL_INFO_LOG_LENGTH, &infoLogLength);
if (infoLogLength > 0) {
std::vector<GLchar> infoLog(infoLogLength);
glGetProgramInfoLog(program.get(), infoLogLength, nullptr, infoLog.data());
mwarning(M_DISPLAY_MESSAGE_DOMAIN,
"OpenGL: Program linking produced the following information log:\n%s",
infoLog.data());
}
GLint linkStatus;
glGetProgramiv(program.get(), GL_LINK_STATUS, &linkStatus);
if (linkStatus != GL_TRUE) {
throw OpenGLException("Program linking failed");
}
return program;
}
Shader createShader(GLenum shaderType, const std::string &glslVersion, const std::string &shaderSource) {
Shader shader(glCreateShader(shaderType));
if (!shader) {
throw OpenGLException("Shader creation failed", glGetError());
}
const std::array<const GLchar *, 5> strings = {
"#version ", glslVersion.data(), "\n",
"precision highp float;\n",
shaderSource.data()
};
glShaderSource(shader.get(), strings.size(), strings.data(), nullptr);
glCompileShader(shader.get());
GLint infoLogLength;
glGetShaderiv(shader.get(), GL_INFO_LOG_LENGTH, &infoLogLength);
if (infoLogLength > 0) {
std::vector<GLchar> infoLog(infoLogLength);
glGetShaderInfoLog(shader.get(), infoLogLength, nullptr, infoLog.data());
mwarning(M_DISPLAY_MESSAGE_DOMAIN,
"OpenGL: Shader compilation produced the following information log:\n%s",
infoLog.data());
}
GLint compileStatus;
glGetShaderiv(shader.get(), GL_COMPILE_STATUS, &compileStatus);
if (compileStatus != GL_TRUE) {
throw OpenGLException("Shader compilation failed");
}
return shader;
}
void OpenGL::CheckError()
{
#ifdef DEBUG
int error = glGetError();
if (error != GL_NO_ERROR)
{
throw OpenGLException(error);
}
#endif
}
TextureUnit::TextureUnit() : unitEnum_(0), unitNumber_(0) {
ivwAssert(!textureUnits_.empty(), "Texture unit handler not initialized.");
// check which texture unit is available
for (size_t i = 1; i < textureUnits_.size(); i++) {
if (textureUnits_[i] == false) {
// unit previously unused, mark as used now
textureUnits_[i] = true;
unitNumber_ = (GLint)i;
unitEnum_ = GL_TEXTURE0 + unitNumber_;
return;
}
}
throw OpenGLException("Exceeding number of available texture units.", IvwContext);
}
