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Ability to load texture into fbo

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This commit is contained in:
Joshua Moerman 2013-01-25 21:20:25 +01:00
parent 06c1ef467e
commit e4d1d9e8e3
6 changed files with 160 additions and 4 deletions
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3
.gitignore vendored Normal file
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@ -0,0 +1,3 @@
build
.DS_Store
xcuserdata

7
J.xcodeproj/project.pbxproj
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@ -16,6 +16,7 @@
4268136F140A321800CBF943 /* J.mm in Sources */ = {isa = PBXBuildFile; fileRef = 4268136E140A321800CBF943 /* J.mm */; };
4283A45F14115AC400036A5D /* interpolator.h in Headers */ = {isa = PBXBuildFile; fileRef = 4283A45E14115AC300036A5D /* interpolator.h */; };
4283A4641411707700036A5D /* array.h in Headers */ = {isa = PBXBuildFile; fileRef = 4283A4631411707700036A5D /* array.h */; };
429E3BAB159616FD0044306C /* texture_objc.mm in Sources */ = {isa = PBXBuildFile; fileRef = 429E3BAA159616FD0044306C /* texture_objc.mm */; };
42ED6A6B140A380000402F76 /* fbo.h in Headers */ = {isa = PBXBuildFile; fileRef = 42ED6A68140A380000402F76 /* fbo.h */; };
42ED6A6C140A380000402F76 /* shader.h in Headers */ = {isa = PBXBuildFile; fileRef = 42ED6A69140A380000402F76 /* shader.h */; };
42ED6A6D140A380000402F76 /* to_string.h in Headers */ = {isa = PBXBuildFile; fileRef = 42ED6A6A140A380000402F76 /* to_string.h */; };
@ -33,6 +34,9 @@
4268136E140A321800CBF943 /* J.mm */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.objcpp; path = J.mm; sourceTree = "<group>"; };
4283A45E14115AC300036A5D /* interpolator.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = interpolator.h; sourceTree = "<group>"; };
4283A4631411707700036A5D /* array.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = array.h; sourceTree = "<group>"; };
429E3BA715960FCA0044306C /* texture.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = texture.h; sourceTree = "<group>"; };
429E3BA9159616C00044306C /* texture_objc.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = texture_objc.h; sourceTree = "<group>"; };
429E3BAA159616FD0044306C /* texture_objc.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = texture_objc.mm; sourceTree = "<group>"; };
42ED6A68140A380000402F76 /* fbo.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = fbo.h; sourceTree = "<group>"; };
42ED6A69140A380000402F76 /* shader.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = shader.h; sourceTree = "<group>"; };
42ED6A6A140A380000402F76 /* to_string.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = to_string.h; sourceTree = "<group>"; };
@ -115,6 +119,9 @@
425E9DF1140A74DA00A81A65 /* basic.h */,
425E9DF5140A774D00A81A65 /* basic.cpp */,
42ED6A68140A380000402F76 /* fbo.h */,
429E3BA715960FCA0044306C /* texture.h */,
429E3BA9159616C00044306C /* texture_objc.h */,
429E3BAA159616FD0044306C /* texture_objc.mm */,
425E9DF8140A7EB400A81A65 /* fbo.mm */,
42ED6A69140A380000402F76 /* shader.h */,
);

23
J/fbo.h
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@ -23,6 +23,7 @@
#include "to_string.h"
#include "basic.h"
#include "texture.h"
@class EAGLContext;
@class CAEAGLLayer;
@ -45,14 +46,15 @@ public:
public:
// standard ctor, makes use of textures
fbo(int width, int height) : width(width), height(height), fbo_number(0), renderbuffers(), texture_id(0) {
template <typename Texture = no_texture>
fbo(int width, int height, Texture const & texture = no_texture()) : width(width), height(height), fbo_number(0), renderbuffers(), texture_id(0) {
glGenFramebuffers(1, &fbo_number);
bind();
// generate texture
glGenTextures(1, &texture_id);
glBindTexture(GL_TEXTURE_2D, texture_id);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
bool should_clear = !make_tex(texture);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture_id, 0);
// attach depth
@ -61,8 +63,10 @@ public:
check_error();
check_status();
glClearColor(0.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
if(should_clear){
glClearColor(0.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}
unbind();
}
@ -96,6 +100,17 @@ public:
}
private:
template <typename Texture>
bool make_tex(Texture const & texture){
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, Texture::gl_format, Texture::gl_type, texture.data());
return true;
}
bool make_tex(no_texture const &){
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
return false;
}
void bind(){
glBindFramebuffer(GL_FRAMEBUFFER, fbo_number);
check_error();

86
J/texture.h Normal file
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@ -0,0 +1,86 @@
//
// texture.h
// J
//
// Created by Joshua Moerman on 6/23/12.
// Copyright (c) 2012 Vadovas. All rights reserved.
//
#ifndef J_texture_h
#define J_texture_h
#include "basic.h"
#include <vector>
#include <algorithm>
namespace J {
struct no_texture {};
template <typename T>
struct gl_type {};
template <>
struct gl_type<uint8_t> {
static constexpr GLenum value = GL_UNSIGNED_BYTE;
};
template <typename T = uint8_t>
struct rgba {
typedef typename std::vector<T>::iterator iterator;
typedef typename std::vector<T>::iterator const_iterator;
typedef typename std::vector<T>::size_type size_type;
static constexpr GLenum gl_type = J::gl_type<T>::value;
static constexpr GLenum gl_format = GL_RGBA;
rgba(size_type w, size_type h, T const * data = nullptr)
: width_(w)
, height_(h)
, pixels(w*h*4){
if(data)
std::copy_n(data, w*h*4, pixels.begin());
}
size_type size() const { return pixels.size(); }
size_type width() const { return width; }
size_type height() const { return height; }
struct row_proxy {
row_proxy(T* data) : data(data) {}
T& operator[](size_type x){ return data[x]; }
T operator[](size_type x) const { return data[x]; }
T* data;
};
row_proxy operator[](size_type y){
return &pixels[y*width()];
}
struct const_row_proxy {
const_row_proxy(T const * data) : data(data) {}
T operator[](size_type x) const { return data[x]; }
T const * data;
};
const_row_proxy operator[](size_type y) const {
return &pixels[y*width()];
}
T * data() { return pixels.data(); }
T const * data() const { return pixels.data(); }
iterator begin() { return pixels.begin(); }
iterator end() { return pixels.begin(); }
const_iterator begin() const { return pixels.begin(); }
const_iterator end() const { return pixels.begin(); }
private:
size_type width_;
size_type height_;
std::vector<T> pixels;
};
}
#endif

22
J/texture_objc.h Normal file
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@ -0,0 +1,22 @@
//
// texture_objc.h
// J
//
// Created by Joshua Moerman on 6/23/12.
// Copyright (c) 2012 Vadovas. All rights reserved.
//
#ifndef J_texture_objc_h
#define J_texture_objc_h
#include "texture.h"
@class UIImage;
namespace J {
rgba<> texture_from_UIImage(UIImage * image);
}
#endif

23
J/texture_objc.mm Normal file
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@ -0,0 +1,23 @@
//
// texture_objc.mm
// J
//
// Created by Joshua Moerman on 6/23/12.
// Copyright (c) 2012 Vadovas. All rights reserved.
//
#include "texture_objc.h"
#import <UIKit/UIKit.h>
//#import <Quartz/Quartz.h>
namespace J {
rgba<> texture_from_UIImage(UIImage * image){
CGImageRef cgImage = image.CGImage;
CGDataProviderRef provider = CGImageGetDataProvider(cgImage);
CFDataRef bitmapData = CGDataProviderCopyData(provider);
CFDataGetBytePtr(bitmapData);
return rgba<>(image.size.width, image.size.height, CFDataGetBytePtr(bitmapData));
}
}