////////////////////////////////////////////////////////////
/// \brief Constructor: set up state before uniform is set
///
////////////////////////////////////////////////////////////
UniformBinder(Shader& shader, const std::string& name) :
savedProgram(0),
currentProgram(castToGlHandle(shader.m_shaderProgram)),
location(-1)
{
if (currentProgram)
{
ensureGlContext();
// Enable program object
glCheck(savedProgram = GLEXT_glGetHandle(GLEXT_GL_PROGRAM_OBJECT));
if (currentProgram != savedProgram)
glCheck(GLEXT_glUseProgramObject(currentProgram));
// Store uniform location for further use outside constructor
location = shader.getUniformLocation(name);
}
}
void Shader::setParameter(const std::string& name, const Transform& transform)
{
if (m_shaderProgram)
{
ensureGlContext();
// Enable program
GLEXT_GLhandle program;
glCheck(program = GLEXT_glGetHandle(GLEXT_GL_PROGRAM_OBJECT));
glCheck(GLEXT_glUseProgramObject(castToGlHandle(m_shaderProgram)));
// Get parameter location and assign it new values
GLint location = getParamLocation(name);
if (location != -1)
{
glCheck(GLEXT_glUniformMatrix4fv(location, 1, GL_FALSE, transform.getMatrix()));
}
// Disable program
glCheck(GLEXT_glUseProgramObject(program));
}
}
void Shader::setParameter(const std::string& name, float x, float y, float z, float w)
{
if (m_shaderProgram)
{
ensureGlContext();
// Enable program
GLEXT_GLhandle program;
glCheck(program = GLEXT_glGetHandle(GLEXT_GL_PROGRAM_OBJECT));
glCheck(GLEXT_glUseProgramObject(castToGlHandle(m_shaderProgram)));
// Get parameter location and assign it new values
GLint location = getParamLocation(name);
if (location != -1)
{
glCheck(GLEXT_glUniform4f(location, x, y, z, w));
}
// Disable program
glCheck(GLEXT_glUseProgramObject(program));
}
}
