+++ /dev/null
-#include <png.h>
-#include <msp/error.h>
-#include "texture2d.h"
-
-using namespace std;
-
-namespace Msp {
-namespace GL {
-
-Texture2D::Texture2D()
-{
- target=GL_TEXTURE_2D;
-}
-
-/**
-Uploads an image into the texture. Direct wrapper for glTexImage2D.
-*/
-void Texture2D::image(int level, int ifmt, sizei width, sizei height, int border, GLenum fmt, GLenum type, void *data)
-{
- if(bound!=this) bind();
- glTexImage2D(target, level, ifmt, width, height, border, fmt, type, data);
-}
-
-/**
-Uploads an image into the texture.
-*/
-void Texture2D::image(int level, sizei width, sizei height, TextureFormat tfmt, 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; 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; break;
- default: return;
- }
-
- image(level, ifmt, width, height, 0, 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)
-{
- 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 width=png_get_image_width(pngs, pngi);
- unsigned height=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;
- }
-
- png_byte *data=(png_byte *)malloc(width*height*planes);
- png_byte *row_ptrs[height];
- for(unsigned i=0; i<height; ++i)
- row_ptrs[i]=data+(height-1-i)*width*planes;
-
- png_read_image(pngs, row_ptrs);
-
- image(0, width, height, fmt, data);
- free(data);
-
- png_destroy_read_struct(&pngs, &pngi, 0);
- fclose(file);
-}
-
-} // namespace GL
-} // namespace Msp