mkxp/src/gl-util.h

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/*
** gl-util.h
**
** This file is part of mkxp.
**
** Copyright (C) 2013 Jonas Kulla <Nyocurio@gmail.com>
**
** mkxp 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.
**
** mkxp 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 mkxp. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef GLUTIL_H
#define GLUTIL_H
#include "gl-fun.h"
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#include "etc-internal.h"
/* Struct wrapping GLuint for some light type safety */
#define DEF_GL_ID \
struct ID \
{ \
GLuint gl; \
explicit ID(GLuint gl = 0) \
: gl(gl) \
{} \
ID &operator=(const ID &o) \
{ \
gl = o.gl; \
return *this; \
} \
bool operator==(const ID &o) const \
{ \
return gl == o.gl; \
} \
bool operator!=(const ID &o) const \
{ \
return !(*this == o); \
} \
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};
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/* 2D Texture */
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namespace TEX
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{
DEF_GL_ID
inline ID gen()
{
ID id;
gl.GenTextures(1, &id.gl);
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return id;
}
static inline void del(ID id)
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{
gl.DeleteTextures(1, &id.gl);
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}
static inline void bind(ID id)
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{
gl.BindTexture(GL_TEXTURE_2D, id.gl);
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}
static inline void unbind()
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{
bind(ID(0));
}
static inline void uploadImage(GLsizei width, GLsizei height, const void *data, GLenum format)
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{
gl.TexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, format, GL_UNSIGNED_BYTE, data);
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}
static inline void uploadSubImage(GLint x, GLint y, GLsizei width, GLsizei height, const void *data, GLenum format)
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{
gl.TexSubImage2D(GL_TEXTURE_2D, 0, x, y, width, height, format, GL_UNSIGNED_BYTE, data);
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}
static inline void allocEmpty(GLsizei width, GLsizei height)
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{
gl.TexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
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}
static inline void setRepeat(bool mode)
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{
gl.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, mode ? GL_REPEAT : GL_CLAMP_TO_EDGE);
gl.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, mode ? GL_REPEAT : GL_CLAMP_TO_EDGE);
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}
static inline void setSmooth(bool mode)
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{
gl.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, mode ? GL_LINEAR : GL_NEAREST);
gl.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mode ? GL_LINEAR : GL_NEAREST);
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}
}
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/* Framebuffer Object */
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namespace FBO
{
DEF_GL_ID
inline ID gen()
{
ID id;
gl.GenFramebuffers(1, &id.gl);
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return id;
}
static inline void del(ID id)
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{
gl.DeleteFramebuffers(1, &id.gl);
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}
static inline void bind(ID id)
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{
gl.BindFramebuffer(GL_FRAMEBUFFER, id.gl);
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}
static inline void unbind()
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{
bind(ID(0));
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}
static inline void setTarget(TEX::ID target, unsigned colorAttach = 0)
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{
gl.FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + colorAttach, GL_TEXTURE_2D, target.gl, 0);
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}
static inline void clear()
{
gl.Clear(GL_COLOR_BUFFER_BIT);
}
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}
template<GLenum target>
struct GenericBO
{
DEF_GL_ID
static inline ID gen()
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{
ID id;
gl.GenBuffers(1, &id.gl);
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return id;
}
static inline void del(ID id)
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{
gl.DeleteBuffers(1, &id.gl);
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}
static inline void bind(ID id)
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{
gl.BindBuffer(target, id.gl);
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}
static inline void unbind()
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{
bind(ID(0));
}
static inline void uploadData(GLsizeiptr size, const GLvoid *data, GLenum usage = GL_STATIC_DRAW)
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{
gl.BufferData(target, size, data, usage);
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}
static inline void uploadSubData(GLintptr offset, GLsizeiptr size, const GLvoid *data)
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{
gl.BufferSubData(target, offset, size, data);
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}
static inline void allocEmpty(GLsizeiptr size, GLenum usage = GL_STATIC_DRAW)
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{
uploadData(size, 0, usage);
}
};
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/* Vertex Buffer Object */
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typedef struct GenericBO<GL_ARRAY_BUFFER> VBO;
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/* Index Buffer Object */
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typedef struct GenericBO<GL_ELEMENT_ARRAY_BUFFER> IBO;
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#undef DEF_GL_ID
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/* Convenience struct wrapping a framebuffer
* and a 2D texture as its target */
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struct TEXFBO
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{
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TEX::ID tex;
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FBO::ID fbo;
int width, height;
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TEXFBO()
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: tex(0), fbo(0), width(0), height(0)
{}
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bool operator==(const TEXFBO &other) const
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{
return (tex == other.tex) && (fbo == other.fbo);
}
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static inline void init(TEXFBO &obj)
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{
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obj.tex = TEX::gen();
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obj.fbo = FBO::gen();
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TEX::bind(obj.tex);
TEX::setRepeat(false);
TEX::setSmooth(false);
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}
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static inline void allocEmpty(TEXFBO &obj, int width, int height)
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{
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TEX::bind(obj.tex);
TEX::allocEmpty(width, height);
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obj.width = width;
obj.height = height;
}
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static inline void linkFBO(TEXFBO &obj)
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{
FBO::bind(obj.fbo);
FBO::setTarget(obj.tex);
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}
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static inline void fini(TEXFBO &obj)
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{
FBO::del(obj.fbo);
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TEX::del(obj.tex);
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}
static inline void clear(TEXFBO &obj)
{
obj.tex = TEX::ID(0);
obj.fbo = FBO::ID(0);
obj.width = obj.height = 0;
}
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};
#endif // GLUTIL_H