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/* ResidualVM - A 3D game interpreter
*
* ResidualVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef GRAPHICS_OPENGL_SHADER_H
#define GRAPHICS_OPENGL_SHADER_H
#include "common/file.h"
#include "common/array.h"
#include "common/ptr.h"
#include "math/matrix3.h"
#include "math/matrix4.h"
#include "math/vector2d.h"
#include "math/vector3d.h"
#include "math/vector4d.h"
#include "graphics/opengl/system_headers.h"
namespace OpenGL {
namespace BuiltinShaders {
extern const char *boxVertex, *boxFragment;
extern const char *compatVertex, *compatFragment;
extern const char *controlVertex, *controlFragment;
}
struct VertexAttrib {
VertexAttrib(uint32 idx, const char *name) :
_enabled(false), _idx(idx), _name(name), _vbo(0), _size(0),
_type(GL_FLOAT), _normalized(false), _stride(0), _offset(0) {}
bool _enabled;
uint32 _idx;
Common::String _name;
GLuint _vbo;
GLint _size;
GLenum _type;
bool _normalized;
GLsizei _stride;
size_t _offset;
float _const[4];
};
class Shader {
typedef Common::HashMap<Common::String, GLint> UniformsMap;
public:
~Shader();
Shader* clone() {
return new Shader(*this);
}
void use(bool forceReload = false);
void setUniform(const char *uniform, const Math::Matrix4 &m) {
GLint pos = getUniformLocation(uniform);
if (pos != -1)
glUniformMatrix4fv(pos, 1, GL_FALSE, m.getData());
}
void setUniform(const char* uniform, const Math::Matrix3 &m) {
GLint pos = getUniformLocation(uniform);
if (pos != -1)
glUniformMatrix3fv(pos, 1, GL_FALSE, m.getData());
}
void setUniform(const char *uniform, const Math::Vector4d &v) {
GLint pos = getUniformLocation(uniform);
if (pos != -1)
glUniform4fv(pos, 1, v.getData());
}
void setUniform(const char *uniform, const Math::Vector3d &v) {
GLint pos = getUniformLocation(uniform);
if (pos != -1)
glUniform3fv(pos, 1, v.getData());
}
void setUniform(const char *uniform, const Math::Vector2d &v) {
GLint pos = getUniformLocation(uniform);
if (pos != -1)
glUniform2fv(pos, 1, v.getData());
}
void setUniform(const char *uniform, unsigned int x) {
GLint pos = getUniformLocation(uniform);
if (pos != -1)
glUniform1i(pos, x);
}
// Different name to avoid overload ambiguity
void setUniform1f(const char *uniform, float f) {
GLint pos = getUniformLocation(uniform);
if (pos != -1)
glUniform1f(pos, f);
}
GLint getUniformLocation(const char *uniform) const {
UniformsMap::iterator kv = _uniforms->find(uniform);
if (kv == _uniforms->end()) {
GLint ret = glGetUniformLocation(*_shaderNo, uniform);
_uniforms->setVal(uniform, ret);
return ret;
} else {
return kv->_value;
}
}
void enableVertexAttribute(const char *attrib, GLuint vbo, GLint size, GLenum type, GLboolean normalized, GLsizei stride, uint32 offset);
void disableVertexAttribute(const char *attrib, int size, const float *data);
template <int r>
void disableVertexAttribute(const char *attrib, const Math::Matrix<r,1> &m) {
disableVertexAttribute(attrib, r, m.getData());
}
VertexAttrib & getAttributeAt(uint32 idx);
VertexAttrib & getAttribute(const char *attrib);
static GLuint createBuffer(GLenum target, GLsizeiptr size, const GLvoid* data, GLenum usage = GL_STATIC_DRAW);
static void freeBuffer(GLuint vbo);
static Shader* fromFiles(const char *vertex, const char *fragment, const char **attributes);
static Shader* fromFiles(const char *shared, const char **attributes) {
return fromFiles(shared, shared, attributes);
}
static Shader* fromStrings(const Common::String &name, const char *vertex, const char *fragment, const char **attributes);
void unbind();
private:
Shader(const Common::String &name, GLuint vertexShader, GLuint fragmentShader, const char **attributes);
// Since this class is cloned using the implicit copy constructor,
// a reference counting pointer is used to ensure deletion of the OpenGL
// program upon destruction of the last clone.
Common::SharedPtr<GLuint> _shaderNo;
Common::String _name;
Common::Array<VertexAttrib> _attributes;
Common::SharedPtr<UniformsMap> _uniforms;
static Shader *_previousShader;
};
} // End of namespace OpenGL
#endif
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