vcglib/wrap/gl/shaders.h

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#ifndef __SHADERS_H__
#define __SHADERS_H__
#include <GL/glew.h>
#include <stdio.h>
#include <set>
#include "gl_object.h"
#include "../../vcg/space/point2.h"
#include "../../vcg/space/point3.h"
#include "../../vcg/space/point4.h"
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class Shader : public GLObject, public Bindable
{
public:
typedef enum
{
VERTEX,
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FRAGMENT,
GEOMETRY
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} ShaderType;
Shader(void) : GLObject(), Bindable()
{
this->flags = 0;
this->flags |= SOURCE_DIRTY;
this->compiled = false;
}
void Gen(void)
{
this->Del();
GLenum t;
switch (this->Type())
{
case Shader::VERTEX : t = GL_VERTEX_SHADER; break;
case Shader::FRAGMENT : t = GL_FRAGMENT_SHADER; break;
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case Shader::GEOMETRY : t = GL_GEOMETRY_SHADER_EXT; break;
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default: return;
};
this->objectID = glCreateShader(t);
}
void Del(void)
{
if (this->objectID == 0) return;
glDeleteShader(this->objectID);
this->objectID = 0;
}
virtual ShaderType Type(void) const = 0;
void SetSource(const char * src)
{
if (this->objectID==0)
Gen();
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this->flags |= SOURCE_DIRTY;
this->compiled = false;
this->source = src;
const char * pSrc = this->source.c_str();
glShaderSource(this->objectID, 1, &pSrc, 0);
}
bool LoadSource(const char * fileName)
{
if (this->objectID==0)
Gen();
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this->flags |= SOURCE_DIRTY;
this->compiled = false;
FILE * f = fopen(fileName, "rb");
if (f == 0)
{
this->source = "";
return false;
}
fseek(f, 0, SEEK_END);
const size_t sz = (size_t)ftell(f);
rewind(f);
char * buff = new char[sz + 1];
fread(buff, sizeof(char), sz, f);
fclose(f);
buff[sz] = '\0';
this->source = buff;
delete [] buff;
const char * pSrc = this->source.c_str();
glShaderSource(this->objectID, 1, &pSrc, 0);
return true;
}
bool Compile(void)
{
glCompileShader(this->objectID);
GLint cm = 0;
glGetShaderiv(this->objectID, GL_COMPILE_STATUS, &cm);
this->compiled = (cm != GL_FALSE);
this->flags = 0;
return this->compiled;
}
bool IsCompiled(void)
{
return this->compiled;
}
std::string InfoLog(void)
{
GLint len = 0;
glGetShaderiv(this->objectID, GL_INFO_LOG_LENGTH, &len);
char * ch = new char[len + 1];
glGetShaderInfoLog(this->objectID, len, &len, ch);
std::string infoLog = ch;
delete [] ch;
return infoLog;
}
protected:
enum
{
SOURCE_DIRTY
};
std::string source;
unsigned int flags;
bool compiled;
void DoBind(void)
{
}
void DoUnbind(void)
{
}
};
class VertexShader : public Shader
{
public:
VertexShader(void) : Shader()
{
}
ShaderType Type(void) const
{
return Shader::VERTEX;
}
};
class FragmentShader : public Shader
{
public:
FragmentShader(void) : Shader()
{
}
ShaderType Type(void) const
{
return Shader::FRAGMENT;
}
};
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class GeometryShader : public Shader
{
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public:
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GeometryShader(void) : Shader()
{
}
ShaderType Type(void) const
{
return Shader::GEOMETRY;
}
};
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#if 0
class Program;
class Uniform
{
friend class Program;
public:
/*
typedef enum
{
U_BOOL,
U_BVEC2,
U_BVEC3,
U_BVEC4,
U_BMAT2,
U_BMAT3,
U_BMAT4,
U_INT,
U_IVEC2,
U_IVEC3,
U_IVEC4,
U_IMAT2,
U_IMAT3,
U_IMAT4,
U_FLOAT,
U_FVEC2,
U_FVEC3,
U_FVEC4,
U_FMAT2,
U_FMAT3,
U_FMAT4,
U_SAMPLER1D,
U_SAMPLER2D,
U_SAMPLER3D,
U_SAMPLERCUBE,
U_SAMPLER1DSHADOW,
U_SAMPLER2DSHADOW
} UniformType;
*/
const std::string & Name(void) const
{
return this->name;
}
virtual GLenum Type(void) const = 0;
protected:
Program * prog;
GLint location;
std::string name;
Uniform(Program * prog, GLint location, const std::string & name)
{
this->prog = prog;
this->location = location;
this->name = name;
}
virtual void Apply(void) = 0;
};
class Uniform1b : public Uniform;
{
public:
void SetValue(GLboolean x)
{
this->value[0] = x;
}
GLboolean GetValue(void) const
{
return this->value[0];
}
protected:
Program * prog;
GLboolean value[1];
Uniform(Program * prog, GLint location, const std::string & name) : Uniform(prog, location, name)
{
this->value = GL_FALSE;
}
};
class Uniform2b : public Uniform;
{
public:
void SetValue(GLboolean x, GLboolean y)
{
this->value[0] = x;
this->value[1] = y;
}
GLboolean GetValueX(void) const
{
return this->value[0];
}
GLboolean GetValueY(void) const
{
return this->value[1];
}
protected:
Program * prog;
GLboolean value[2];
Uniform(Program * prog, GLint location, const std::string & name) : Uniform(prog, location, name)
{
this->value[0] = GL_FALSE;
this->value[1] = GL_FALSE;
}
};
class Uniform3b : public Uniform;
{
public:
void SetValue(GLboolean x, GLboolean y, GLboolean z)
{
this->value[0] = x;
this->value[1] = y;
this->value[2] = z;
}
GLboolean GetValueX(void) const
{
return this->value[0];
}
GLboolean GetValueY(void) const
{
return this->value[1];
}
GLboolean GetValueZ(void) const
{
return this->value[2];
}
protected:
Program * prog;
GLboolean value[2];
Uniform(Program * prog, GLint location, const std::string & name) : Uniform(prog, location, name)
{
this->value[0] = GL_FALSE;
this->value[1] = GL_FALSE;
}
};
class Uniform1i : public Uniform;
{
public:
void SetValue(GLint v)
{
this->value = v;
}
GLint GetValue(void) const
{
return this->value;
}
protected:
Program * prog;
GLint value;
Uniform(Program * prog, GLint location, const std::string & name) : Uniform(prog, location, name)
{
this->value = 0;
}
};
#endif
class Program : public GLObject, public Bindable
{
public:
Program(void)
{
this->linked = false;
}
void Gen(void)
{
this->Del();
this->objectID = glCreateProgram();
}
void Del(void)
{
if (this->objectID == 0) return;
glDeleteProgram(this->objectID);
this->objectID = 0;
}
void Attach(Shader * shd)
{
if (this->objectID==0)
Gen();
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this->shaders.insert(shd);
this->linked = false;
glAttachShader(this->objectID, shd->ObjectID());
}
void Detach(Shader * shd)
{
this->shaders.erase(shd);
this->linked = false;
glDetachShader(this->objectID, shd->ObjectID());
}
GLsizei AttachedShaders(void) const
{
return ((GLsizei)(this->shaders.size()));
}
Shader * AttachedShader(int i)
{
Shader * shd = 0;
int cnt = 0;
for (std::set<Shader *>::iterator it=this->shaders.begin(); (cnt < i) && (it!=this->shaders.end()); ++it)
{
shd = (*it);
}
return shd;
}
bool Link(void)
{
bool ok = true;
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for (std::set<Shader *>::iterator it=this->shaders.begin(); it!=this->shaders.end(); ++it)
{
Shader * shd = (*it);
if (!shd->IsCompiled())
{
ok = shd->Compile() && ok;
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}
}
if (!ok)
return false;
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glLinkProgram(this->objectID);
GLint cm = 0;
glGetProgramiv(this->objectID, GL_LINK_STATUS, &cm);
this->linked = (cm != GL_FALSE);
return this->linked;
}
bool IsLinked(void) const
{
return this->linked;
}
std::string InfoLog(void)
{
GLint len = 0;
glGetProgramiv(this->objectID, GL_INFO_LOG_LENGTH, &len);
char * ch = new char[len + 1];
glGetProgramInfoLog(this->objectID, len, &len, ch);
std::string infoLog = ch;
delete [] ch;
return infoLog;
}
void Uniform(const char * name, GLint x)
{
const GLint loc = glGetUniformLocation(this->objectID, name);
glUniform1i(loc, x);
}
void Uniform(const char * name, GLint x, GLint y)
{
const GLint loc = glGetUniformLocation(this->objectID, name);
glUniform2i(loc, x, y);
}
void Uniform(const char * name, GLint x, GLint y, GLint z)
{
const GLint loc = glGetUniformLocation(this->objectID, name);
glUniform3i(loc, x, y, z);
}
void Uniform(const char * name, GLint x, GLint y, GLint z, GLint w)
{
const GLint loc = glGetUniformLocation(this->objectID, name);
glUniform4i(loc, x, y, z, w);
}
void Uniform(const char * name, GLfloat x)
{
const GLint loc = glGetUniformLocation(this->objectID, name);
glUniform1f(loc, x);
}
void Uniform(const char * name, GLfloat x, GLfloat y)
{
const GLint loc = glGetUniformLocation(this->objectID, name);
glUniform2f(loc, x, y);
}
void Uniform(const char * name, GLfloat x, GLfloat y, GLfloat z)
{
const GLint loc = glGetUniformLocation(this->objectID, name);
glUniform3f(loc, x, y, z);
}
void Uniform(const char * name, GLfloat x, GLfloat y, GLfloat z, GLfloat w)
{
const GLint loc = glGetUniformLocation(this->objectID, name);
glUniform4f(loc, x, y, z, w);
}
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void Uniform(const char * name, const vcg::Point2f& p)
{
const GLint loc = glGetUniformLocation(this->objectID, name);
glUniform2fv(loc, 1, p.V());
}
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void Uniform(const char * name, const vcg::Point3f& p)
{
const GLint loc = glGetUniformLocation(this->objectID, name);
glUniform3fv(loc, 1, p.V());
}
void Uniform(const char * name, const vcg::Point4f& p)
{
const GLint loc = glGetUniformLocation(this->objectID, name);
glUniform4fv(loc, 1, p.V());
}
void Parameter(GLenum pname, int value)
{
glProgramParameteriEXT(this->objectID, pname, value);
}
void Attribute(int index, GLfloat x, GLfloat y, GLfloat z, GLfloat w)
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{
glVertexAttrib4f(index, x, y, z, w);
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}
void BindAttribute(int index, const char * name)
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{
glBindAttribLocation(this->objectID, index, name);
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}
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protected:
std::set<Shader *> shaders;
bool linked;
void DoBind(void)
{
if (!this->IsLinked())
{
this->Link();
}
glUseProgram(this->objectID);
}
void DoUnbind(void)
{
glUseProgram(0);
}
};
class ProgramVF : public Bindable
{
public:
Program prog;
VertexShader vshd;
FragmentShader fshd;
ProgramVF(void) : Bindable()
{
}
void SetSources(const char * vsrc, const char * fsrc)
{
if (vsrc) {
this->vshd.SetSource(vsrc);
this->prog.Attach(&(this->vshd));
}
if (fsrc) {
this->fshd.SetSource(fsrc);
this->prog.Attach(&(this->fshd));
}
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}
void LoadSources(const char * vfile, const char * ffile)
{
if (vfile) {
this->vshd.LoadSource(vfile);
this->prog.Attach(&(this->vshd));
}
if (ffile) {
this->fshd.LoadSource(ffile);
this->prog.Attach(&(this->fshd));
}
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}
protected:
void DoBind(void)
{
this->prog.Bind();
}
void DoUnbind(void)
{
this->prog.Unbind();
}
};
#endif // __SHADERS_H__