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//
// Copyright (c) 2011-2012 Linaro Limited
//
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the MIT License which accompanies
// this distribution, and is available at
// http://www.opensource.org/licenses/mit-license.php
//
// Contributors:
// Jesse Barker - original implementation.
//
#ifndef PROGRAM_H_
#define PROGRAM_H_
#include <string>
#include <vector>
#include <map>
#include "mat.h"
// Simple shader container. Abstracts all of the OpenGL bits, but leaves
// much of the semantics intact. This is typically only referenced directly
// by the program object.
class Shader
{
public:
Shader() :
handle_(0),
type_(0),
ready_(false),
valid_(false) {}
Shader(const Shader& shader) :
handle_(shader.handle_),
type_(shader.type_),
source_(shader.source_),
message_(shader.message_),
ready_(shader.ready_),
valid_(shader.valid_) {}
Shader(unsigned int type, const std::string& source);
~Shader();
// Compiles the shader source so that it can be linked into a
// program.
//
// Make sure the shader is "valid" before calling this one.
void compile();
// Attaches a compiled shader to a program in preparation for
// linking.
//
// Make sure the shader is "ready" before calling this one.
void attach(unsigned int program);
// Release any resources associated with this shader back to
// OpenGL
void release();
// If "valid" then the shader has successfully been created.
// If "ready" then the shader has successfully been compiled.
// If either is false, then additional information can be obtained
// from the error message.
bool valid() const { return valid_; }
bool ready() const { return ready_; }
const std::string& errorMessage() const { return message_; }
private:
unsigned int handle_;
unsigned int type_;
std::string source_;
std::string message_;
bool ready_;
bool valid_;
};
// Simple program container. Abstracts all of the OpenGL bits, but leaves
// much of the semantics intact.
class Program
{
public:
Program();
~Program();
// Initialize the program object for use.
void init();
// Release any resources associated with this program back to
// OpenGL
void release();
// Create a new shader of the given type and source, compile it and
// attach it to the program.
//
// Make sure the program is "valid" before calling this one.
void addShader(unsigned int type, const std::string& source);
// Link all of the attached shaders into a runnable program for use
// in a rendering operation.
//
// Make sure the program is "valid" and that at least one shader
// has been successfully added before calling this one.
void build();
// Bind the program for use by the rendering context (i.e. actually
// run it).
//
// Make sure the program is "ready" before calling this one.
void start();
// Unbind the program from use by the rendering context (i.e. stop
// using it).
void stop();
class Symbol
{
public:
enum SymbolType
{
None,
Attribute,
Uniform
};
Symbol(const std::string& name, int location, SymbolType type) :
type_(type),
location_(location),
name_(name) {}
int location() const { return location_; }
// These members cause data to be bound to program variables, so
// the program must be bound for use for these to be effective.
Symbol& operator=(const LibMatrix::mat4& m);
Symbol& operator=(const LibMatrix::mat3& m);
Symbol& operator=(const LibMatrix::vec2& v);
Symbol& operator=(const LibMatrix::vec3& v);
Symbol& operator=(const LibMatrix::vec4& v);
Symbol& operator=(const float& f);
Symbol& operator=(const int& i);
private:
Symbol();
SymbolType type_;
GLint location_;
std::string name_;
};
// Get the handle to a named program input (the location in OpenGL
// vernacular). Typically used in conjunction with various VertexAttrib
// interfaces. Equality operators are used to load uniform data.
Symbol& operator[](const std::string& name);
// If "valid" then the program has successfully been created.
// If "ready" then the program has successfully been built.
// If either is false, then additional information can be obtained
// from the error message.
bool valid() const { return valid_; }
bool ready() const { return ready_; }
const std::string& errorMessage() const { return message_; }
private:
int getAttribIndex(const std::string& name);
int getUniformLocation(const std::string& name);
unsigned int handle_;
std::map<std::string, Symbol*> symbols_;
std::vector<Shader> shaders_;
std::string message_;
bool ready_;
bool valid_;
};
#endif // PROGRAM_H_
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