Use DevIL for loading images

[libs/gl.git] / source / texture2d.cpp

diff --git a/source/texture2d.cpp b/source/texture2d.cpp
index c6137d73b60f41c0adeb62f5d6547406a64b9cf2..455c7314cb4d2a04676b1ac6e6612884e95ef212 100644 (file)
--- a/source/texture2d.cpp
+++ b/source/texture2d.cpp
@@ -5,122 +5,72 @@ Copyright © 2007  Mikko Rasa, Mikkosoft Productions
 Distributed under the LGPL
 */
 
-#include <png.h>
 #include "except.h"
+#include "ilwrap.h"
 #include "texture2d.h"
 
 using namespace std;
 
+#include <iostream>
+
 namespace Msp {
 namespace GL {
 
-Texture2D::Texture2D()
+Texture2D::Texture2D():
+       width(0),
+       height(0)
 {
        target=GL_TEXTURE_2D;
+       bind();
 }
 
-/**
-Uploads an image into the texture.  Direct wrapper for glTexImage2D.
-*/
-void Texture2D::image(int level, int ifmt, sizei wd, sizei ht, int border, GLenum fmt, GLenum type, void *data)
+void Texture2D::storage(PixelFormat fmt, sizei wd, sizei ht, int brd)
+{
+       if(width>0)
+               throw InvalidState("Texture storage may only be specified once");
+       if(wd==0 || ht==0)
+               throw InvalidParameterValue("Invalid texture dimensions");
+
+       ifmt=fmt;
+       width=wd;
+       height=ht;
+       border=brd;
+}
+
+void Texture2D::image(int level, PixelFormat fmt, GLenum type, const void *data)
 {
+       if(width==0)
+               throw InvalidState("Texture storage has not been specified");
+
        maybe_bind();
 
-       glTexImage2D(target, level, ifmt, wd, ht, border, fmt, type, data);
-       width_=wd;
-       height_=ht;
+       glTexImage2D(target, level, ifmt, width, height, border, fmt, type, data);
 }
 
-/**
-Uploads an image into the texture, with a simpler interface.
-*/
-void Texture2D::image(int level, sizei wd, sizei ht, TextureFormat tfmt, void *data)
+void Texture2D::sub_image(int level, int x, int y, sizei wd, sizei ht, PixelFormat fmt, GLenum type, const void *data)
 {
-       int ifmt;
-       int fmt;
-       int type;
-
-       switch(tfmt)
-       {
-       case LUMINANCE8:        ifmt=GL_LUMINANCE;       fmt=GL_LUMINANCE;       type=GL_UNSIGNED_BYTE; break;
-       case LUMINANCE8_ALPHA8: ifmt=GL_LUMINANCE_ALPHA; fmt=GL_LUMINANCE_ALPHA; type=GL_UNSIGNED_BYTE; break;
-       case RGB8:  ifmt=GL_RGB;  fmt=GL_RGB;  type=GL_UNSIGNED_BYTE;        break;
-       case RGBA8: ifmt=GL_RGBA; fmt=GL_RGBA; type=GL_UNSIGNED_INT_8_8_8_8_REV; break;
-       case BGR8:  ifmt=GL_RGB;  fmt=GL_BGR;  type=GL_UNSIGNED_BYTE;        break;
-       case BGRA8: ifmt=GL_RGBA; fmt=GL_BGRA; type=GL_UNSIGNED_INT_8_8_8_8_REV; break;
-       default: throw InvalidParameterValue("Invalid texture format");
-       }
-
-       image(level, ifmt, wd, ht, 0, fmt, type, data);
+       if(width==0)
+               throw InvalidState("Texture storage has not been specified");
+
+       maybe_bind();
+
+       glTexSubImage2D(target, level, x, y, wd, ht, fmt, type, data);
 }
 
-/**
-Loads an image from a file and uploads it into the texture.  Currently assumes
-the file to be a PNG image.
-*/
-void Texture2D::image(const string &fn)
+void Texture2D::load_image(const string &fn)
 {
-       FILE *file=fopen(fn.c_str(), "r");
-       if(!file) throw Exception("Couldn't open "+fn);
-
-       char sig[8];
-       fread(sig, 8, 1, file);
-       if(png_sig_cmp((png_byte *)sig, 0, 8))
-                throw Exception("Not a PNG image");
-
-       png_struct *pngs=png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
-       png_info   *pngi=png_create_info_struct(pngs);
-
-       if(setjmp(png_jmpbuf(pngs)))
-       {
-               png_destroy_read_struct(&pngs, &pngi, 0);
-               fclose(file);
-               throw Exception("PNG error");
-       }
-       png_init_io(pngs, file);
-       png_set_sig_bytes(pngs, 8);
-
-       png_read_info(pngs, pngi);
-
-       unsigned wd=png_get_image_width(pngs, pngi);
-       unsigned ht=png_get_image_height(pngs, pngi);
-       unsigned depth=png_get_bit_depth(pngs, pngi);
-       unsigned ctype=png_get_color_type(pngs, pngi);
-
-       if(ctype==PNG_COLOR_TYPE_PALETTE || depth<8)
-       {
-               png_destroy_read_struct(&pngs, &pngi, 0);
-               fclose(file);
-               throw Exception("Invalid color type or bit depth");
-       }
-
-       if(depth==16)
-               png_set_strip_16(pngs);
-
-       TextureFormat fmt;
-       unsigned planes;
-
-       switch(ctype)
-       {
-       case PNG_COLOR_TYPE_GRAY: fmt=LUMINANCE8; planes=1; break;
-       case PNG_COLOR_TYPE_GRAY_ALPHA: fmt=LUMINANCE8_ALPHA8; planes=2; break;
-       case PNG_COLOR_TYPE_RGB: fmt=RGB8; planes=3; break;
-       case PNG_COLOR_TYPE_RGB_ALPHA: fmt=RGBA8; planes=4; break;
-       default: throw Exception("Invalid color type");
-       }
-
-       png_byte *data=new png_byte[wd*ht*planes];
-       png_byte *row_ptrs[ht];
-       for(unsigned i=0; i<ht; ++i)
-               row_ptrs[i]=data+(ht-1-i)*wd*planes;
-
-       png_read_image(pngs, row_ptrs);
-
-       image(0, wd, ht, fmt, data);
-       delete[] data;
-
-       png_destroy_read_struct(&pngs, &pngi, 0);
-       fclose(file);
+       Image img;
+       img.load(fn);
+
+       unsigned w=img.get_width();
+       unsigned h=img.get_height();
+       PixelFormat fmt=img.get_format();
+       if(width==0)
+               storage(fmt, w, h, 0);
+       else if(w!=width || h!=height)
+               throw IncompatibleData("Image does not match texture storage");
+
+       image(0, fmt, GL_UNSIGNED_BYTE, img.get_data());
 }
 
 } // namespace GL