mkxp-freebird/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
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#include "glew.h"
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#include "etc-internal.h"
#include <QDebug>
/* 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; \
} \
};
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/* 2D Texture */
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namespace TEX
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{
DEF_GL_ID
inline ID gen()
{
ID id;
glGenTextures(1, &id.gl);
return id;
}
inline void del(ID id)
{
glDeleteTextures(1, &id.gl);
}
inline void bind(ID id)
{
glBindTexture(GL_TEXTURE_2D, id.gl);
}
inline void unbind()
{
bind(ID(0));
}
inline void uploadImage(GLsizei width, GLsizei height, const void *data, GLenum format)
{
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, format, GL_UNSIGNED_BYTE, data);
}
inline void uploadSubImage(GLint x, GLint y, GLsizei width, GLsizei height, const void *data, GLenum format)
{
glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, width, height, format, GL_UNSIGNED_BYTE, data);
}
inline void allocEmpty(GLsizei width, GLsizei height)
{
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
}
inline void setRepeat(bool mode)
{
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, mode ? GL_REPEAT : GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, mode ? GL_REPEAT : GL_CLAMP_TO_EDGE);
}
inline void setSmooth(bool mode)
{
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, mode ? GL_LINEAR : GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mode ? GL_LINEAR : GL_NEAREST);
}
}
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/* Renderbuffer Object */
namespace RBO
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{
DEF_GL_ID
inline ID gen()
{
ID id;
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glGenRenderbuffersEXT(1, &id.gl);
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return id;
}
inline void del(ID id)
{
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glDeleteRenderbuffersEXT(1, &id.gl);
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}
inline void bind(ID id)
{
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glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, id.gl);
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}
inline void unbind()
{
bind(ID(0));
}
inline void allocEmpty(GLsizei width, GLsizei height)
{
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glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGBA8, width, height);
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}
}
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/* Framebuffer Object */
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namespace FBO
{
DEF_GL_ID
enum Mode
{
Draw = 0,
Read = 1
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};
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enum BlitMode
{
Nearest = 0,
Linear = 1
};
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inline ID gen()
{
ID id;
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glGenFramebuffersEXT(1, &id.gl);
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return id;
}
inline void del(ID id)
{
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glDeleteFramebuffersEXT(1, &id.gl);
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}
inline void bind(ID id, Mode mode)
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{
static const GLenum modes[] =
{
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GL_DRAW_FRAMEBUFFER_EXT,
GL_READ_FRAMEBUFFER_EXT
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};
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glBindFramebufferEXT(modes[mode], id.gl);
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}
inline void unbind(Mode mode)
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{
bind(ID(0), mode);
}
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inline void setTarget(TEX::ID target, unsigned colorAttach = 0)
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{
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glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + colorAttach, GL_TEXTURE_2D, target.gl, 0);
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}
inline void setTarget(RBO::ID target, unsigned colorAttach = 0)
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{
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glFramebufferRenderbufferEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + colorAttach, GL_RENDERBUFFER, target.gl);
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}
inline void blit(int srcX, int srcY,
int srcW, int srcH,
int dstX, int dstY,
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int dstW, int dstH,
BlitMode mode = Nearest)
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{
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static const GLenum modes[] =
{
GL_NEAREST,
GL_LINEAR
};
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glBlitFramebufferEXT(srcX, srcY, srcX+srcW, srcY+srcH,
dstX, dstY, dstX+dstW, dstY+dstH,
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GL_COLOR_BUFFER_BIT, modes[mode]);
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}
inline void blit(int srcX, int srcY,
int dstX, int dstY,
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int srcW, int srcH,
BlitMode mode = Nearest)
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{
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blit(srcX, srcY, srcW, srcH, dstX, dstY, srcW, srcH, mode);
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}
inline Vec4 getPixel(int x, int y)
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{
Vec4 pixel;
glReadPixels(x, y, 1, 1, GL_RGBA, GL_FLOAT, &pixel.x);
return pixel;
}
inline void clear()
{
glClear(GL_COLOR_BUFFER_BIT);
}
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}
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/* Vertex Array Object */
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namespace VAO
{
DEF_GL_ID
inline ID gen()
{
ID id;
glGenVertexArrays(1, &id.gl);
return id;
}
inline void del(ID id)
{
glDeleteVertexArrays(1, &id.gl);
}
inline void bind(ID id)
{
glBindVertexArray(id.gl);
}
inline void unbind()
{
bind(ID(0));
}
}
template<GLenum target>
struct GenericBO
{
DEF_GL_ID
inline static ID gen()
{
ID id;
glGenBuffers(1, &id.gl);
return id;
}
inline static void del(ID id)
{
glDeleteBuffers(1, &id.gl);
}
inline static void bind(ID id)
{
glBindBuffer(target, id.gl);
}
inline static void unbind()
{
bind(ID(0));
}
inline static void uploadData(GLsizeiptr size, const GLvoid *data, GLenum usage = GL_STATIC_DRAW)
{
glBufferData(target, size, data, usage);
}
inline static void uploadSubData(GLintptr offset, GLsizeiptr size, const GLvoid *data)
{
glBufferSubData(target, offset, size, data);
}
inline static void allocEmpty(GLsizeiptr size, GLenum usage = GL_STATIC_DRAW)
{
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
namespace PixelStore
{
/* Setup a 'glSubTexImage2D()' call where the uploaded image
* itself is part of a bigger image in client memory */
inline void setupSubImage(GLint imgWidth, GLint subX, GLint subY)
{
glPixelStorei(GL_UNPACK_ROW_LENGTH, imgWidth);
glPixelStorei(GL_UNPACK_SKIP_PIXELS, subX);
glPixelStorei(GL_UNPACK_SKIP_ROWS, subY);
}
/* Reset all states set with 'setupSubImage()' */
inline void reset()
{
setupSubImage(0, 0, 0);
}
}
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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::Draw);
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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}
};
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/* Convenience struct wrapping a framebuffer
* and a renderbuffer as its target */
struct RBOFBO
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{
RBO::ID rbo;
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FBO::ID fbo;
int width, height;
RBOFBO()
: rbo(0), fbo(0), width(0), height(0)
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{}
static inline void init(RBOFBO &obj)
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{
obj.rbo = RBO::gen();
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obj.fbo = FBO::gen();
}
static inline void allocEmpty(RBOFBO &obj, int width, int height)
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{
RBO::bind(obj.rbo);
RBO::allocEmpty(width, height);
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obj.width = width;
obj.height = height;
}
static inline void linkFBO(RBOFBO &obj)
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{
FBO::bind(obj.fbo, FBO::Draw);
FBO::setTarget(obj.rbo);
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}
static inline void fini(RBOFBO &obj)
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{
FBO::del(obj.fbo);
RBO::del(obj.rbo);
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}
};
#endif // GLUTIL_H