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/*
Copyright (c) 2017,2018 Regents of the University of Minnesota.
All Rights Reserved.
See corresponding header file for details.
*/
#include "texture2d.h"
#include "platform.h"
#pragma warning (push)
#pragma warning (disable : 6001)
#pragma warning (disable : 6011)
#pragma warning (disable : 6262)
#pragma warning (disable : 6385)
#pragma warning (disable : 6387)
#pragma warning (disable : 26450)
#pragma warning (disable : 26451)
#pragma warning (disable : 26453)
#pragma warning (disable : 26495)
#pragma warning (disable : 26812)
#ifdef WIN32
// this is not needed on OSX or Linux, it must pick up the symbols from
// libnanogui.so, but it appears to be needed on Windows.
#define STB_IMAGE_IMPLEMENTATION
#endif
#include <stb_image.h>
#pragma warning (pop)
#include <iostream>
namespace mingfx {
Texture2D::Texture2D(GLenum wrapMode, GLenum filterMode) :
dataType_(GL_UNSIGNED_BYTE), data_ubyte_(NULL), data_float_(NULL),
width_(0), height_(0), handleMemInternally_(true), texID_(0),
wrapMode_(wrapMode), filterMode_(filterMode)
{
}
Texture2D::~Texture2D() {
// Mem handled internally is always of type data_ubyte_ because that is
// what the stbi image loading library returns
if ((handleMemInternally_) && (data_ubyte_ != NULL)) {
// BUG, TODO: Not sure why the call below does not seem to work.
// There will be a mem leak unless we can call this somehow.
//stbi_image_free(data_);
}
// This is how to delete GL's version of the texture on the GPU
// but you have to be very careful with this. For example, if we cause
// C++ to make a tmp copy of the Texture2D or we do an assignment tex1=tex2
// we now have two Texture2D objects pointing to the same OpenGL texture id.
// If one of them is deleted before the other, then the other will not be
// able to draw itself because the OpenGL tex id will be invalid. For now,
// this is "addressed" by simply skipping the glDeleteTextures call. This
// leads to some wasted OpenGL memory, and that would be a good thing to
// fix in the future, maybe via a shared_ptr or static refcount that maps
// opengl texids to a count of Texture2D objects that reference them. Then,
// only delete the opengl tex if the refcount would go to 0.
//glDeleteTextures(1, &texID_);
}
bool Texture2D::InitFromFile(const std::string &filename) {
handleMemInternally_ = true;
dataType_ = GL_UNSIGNED_BYTE;
std::cout << "Loading texture from file: " << filename << std::endl;
if (Platform::FileExists(filename)) {
stbi_set_unpremultiply_on_load(1);
stbi_convert_iphone_png_to_rgb(1);
int numChannels;
data_ubyte_ = stbi_load(filename.c_str(), &width_, &height_, &numChannels, 4);
if (data_ubyte_ == NULL) {
std::cerr << "Texture2D: Failed to load file " << filename << " - " << stbi_failure_reason() << std::endl;
return false;
}
}
else {
std::cerr << "Texture2D: File " << filename << " does not exist." << std::endl;
return false;
}
return InitOpenGL();
}
bool Texture2D::InitFromBytes(int width, int height, const unsigned char * data) {
handleMemInternally_ = false;
width_ = width;
height_ = height;
data_ubyte_ = data;
dataType_ = GL_UNSIGNED_BYTE;
return InitOpenGL();
}
bool Texture2D::InitFromFloats(int width, int height, const float * data) {
handleMemInternally_ = false;
width_ = width;
height_ = height;
data_float_ = data;
dataType_ = GL_FLOAT;
return InitOpenGL();
}
bool Texture2D::InitOpenGL() {
glGenTextures(1, &texID_);
glBindTexture(GL_TEXTURE_2D, texID_);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrapMode_);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrapMode_);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filterMode_);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filterMode_);
if (dataType_ == GL_UNSIGNED_BYTE) {
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width_, height_, 0, GL_RGBA, dataType_, data_ubyte_);
}
else if (dataType_ == GL_FLOAT) {
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width_, height_, 0, GL_RGBA, dataType_, data_float_);
}
else {
std::cerr << "Texture2D: Unsupported texture data type " << dataType_ << "." << std::endl;
return false;
}
return true;
}
bool Texture2D::UpdateFromBytes(const unsigned char * data) {
dataType_ = GL_UNSIGNED_BYTE;
data_ubyte_ = data;
glBindTexture(GL_TEXTURE_2D, texID_);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width_, height_, 0, GL_RGBA, dataType_, data_ubyte_);
// presumably glTexSubImage2D is faster, but this crashes on OSX for some reason
//glActiveTexture(texID_);
//glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width_, height_, GL_RGBA, dataType_, data_ubyte_);
return true;
}
bool Texture2D::UpdateFromFloats(const float * data) {
dataType_ = GL_FLOAT;
data_float_ = data;
glBindTexture(GL_TEXTURE_2D, texID_);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width_, height_, 0, GL_RGBA, dataType_, data_float_);
// presumably glTexSubImage2D is faster, but this crashes on OSX for some reason
//glActiveTexture(texID_);
//glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width_, height_, GL_RGBA, dataType_, data_ubyte_);
return true;
}
int Texture2D::width() const {
return width_;
}
int Texture2D::height() const {
return height_;
}
GLuint Texture2D::opengl_id() const {
if (!initialized()) {
std::cerr << "Texture2D: Warning, accessing opengl_id() before it has been initialized." << std::endl
<< "You might be calling opengl_id() before InitOpenGL(). Or, there might have been a" << std::endl
<< "error loading texture data or binding it to OpenGL." << std::endl;
}
return texID_;
}
GLenum Texture2D::wrap_mode() const {
return wrapMode_;
}
GLenum Texture2D::filter_mode() const {
return filterMode_;
}
void Texture2D::set_wrap_mode(GLenum wrapMode) {
wrapMode_ = wrapMode;
glBindTexture(GL_TEXTURE_2D, texID_);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrapMode_);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrapMode_);
}
void Texture2D::set_filter_mode(GLenum filterMode) {
filterMode_ = filterMode;
glBindTexture(GL_TEXTURE_2D, texID_);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filterMode_);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filterMode_);
}
bool Texture2D::initialized() const {
return texID_ != 0;
}
Color Texture2D::Pixel(int x, int y) const {
int index = y*4*width() + x*4;
if (dataType_ == GL_UNSIGNED_BYTE) {
unsigned char r = data_ubyte_[index+0];
unsigned char g = data_ubyte_[index+1];
unsigned char b = data_ubyte_[index+2];
unsigned char a = data_ubyte_[index+3];
return Color((float)r/255.0f, (float)g/255.0f, (float)b/255.0f, (float)a/255.0f);
}
else if (dataType_ == GL_FLOAT) {
float r = data_float_[index+0];
float g = data_float_[index+1];
float b = data_float_[index+2];
float a = data_float_[index+3];
return Color(r, g, b, a);
}
else {
std::cerr << "Texture2D: Unsupported texture data type " << dataType_ << "." << std::endl;
return Color();
}
}
} // end namespace
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