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#ifndef _ShaderProgram_h_
#define _ShaderProgram_h_
#include <GG/Base.h>
#include <memory>
#include <string>
#include <vector>
class ShaderProgram {
private:
ShaderProgram(); // default ctor forbidden, makes no sense
public:
// Use shaderProgramFactory() to construct.
ShaderProgram(const std::string& vertex_shader, const std::string& fragment_shader);
// shader factory -- will return nullptr if OpenGL version is too low
static std::unique_ptr<ShaderProgram> shaderProgramFactory(
const std::string& vertex_shader, const std::string& fragment_shader);
~ShaderProgram();
GLuint ProgramID() const;
bool LinkSucceeded() const;
const std::string& ProgramInfoLog() const;
const std::string& ProgramValidityInfoLog() const;
const std::string& VertexShaderInfoLog() const;
const std::string& FragmentShaderInfoLog() const;
// These bind the value of the uniform float(s) referred called \a name in
// the program. Multi-float overloads are for when \a name is a vec.
void Bind(const std::string& name, float f);
void Bind(const std::string& name, float f0, float f1);
void Bind(const std::string& name, float f0, float f1, float f2);
void Bind(const std::string& name, float f0, float f1, float f2, float f3);
// Binds the given array of values to the int array \a name in the
// program. \a element_size indicates the number of
// ints in each element of the array, and must be 1, 2, 3, or 4
// (corresponding to GLSL types float, vec2, vec3, and vec4).
void Bind(const std::string& name, std::size_t element_size, const std::vector<float> &floats);
void Bind(const std::string& name, GLuint texture_id);
// These bind the value of the uniform int(s) referred called \a name in
// the program. Multi-int overloads are for when \a name is an ivec.
void BindInt(const std::string& name, int i);
void BindInts(const std::string& name, int i0, int i1);
void BindInts(const std::string& name, int i0, int i1, int i2);
void BindInts(const std::string& name, int i0, int i1, int i2, int i3);
// Binds the given array of values to the int array \a name in the
// program. \a element_size indicates the number of
// ints in each element of the array, and must be 1, 2, 3, or 4
// (corresponding to GLSL types int, ivec2, ivec3, and ivec4).
void BindInts(const std::string& name, std::size_t element_size, const std::vector<GLint> &ints);
bool AllValuesBound();
void Use();
void stopUse();
private:
GLuint m_program_id;
GLuint m_vertex_shader_id;
GLuint m_fragment_shader_id;
bool m_link_succeeded;
std::string m_program_log;
std::string m_program_validity_log;
std::string m_vertex_shader_log;
std::string m_fragment_shader_log;
};
#endif
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