1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/texture.cc	Thu Jul 27 20:36:12 2017 +0300
     1.3 @@ -0,0 +1,103 @@
     1.4 +#include <stdio.h>
     1.5 +#include <imago2.h>
     1.6 +#include "texture.h"
     1.7 +#include "opengl.h"
     1.8 +
     1.9 +Texture::Texture()
    1.10 +{
    1.11 +	width = height = tex_width = tex_height = 0;
    1.12 +	tex = 0;
    1.13 +}
    1.14 +
    1.15 +Texture::~Texture()
    1.16 +{
    1.17 +	if(tex) {
    1.18 +		glDeleteTextures(1, &tex);
    1.19 +	}
    1.20 +}
    1.21 +
    1.22 +static unsigned int next_pow2(unsigned int x)
    1.23 +{
    1.24 +	--x;
    1.25 +	x |= x >> 1;
    1.26 +	x |= x >> 2;
    1.27 +	x |= x >> 4;
    1.28 +	x |= x >> 8;
    1.29 +	x |= x >> 16;
    1.30 +	return x + 1;
    1.31 +}
    1.32 +
    1.33 +bool Texture::load(const char *fname)
    1.34 +{
    1.35 +	img_pixmap img;
    1.36 +	img_init(&img);
    1.37 +	if(img_load(&img, fname) == -1) {
    1.38 +		fprintf(stderr, "failed to load texture: %s\n", fname);
    1.39 +		img_destroy(&img);
    1.40 +		return false;
    1.41 +	}
    1.42 +
    1.43 +	unsigned int intfmt = img_glintfmt(&img);
    1.44 +	unsigned int pixfmt = img_glfmt(&img);
    1.45 +	unsigned int pixtype = img_gltype(&img);
    1.46 +
    1.47 +	// if we have the sRGB extension, change the internal formats to sRGB
    1.48 +	if(GLEW_EXT_texture_sRGB) {
    1.49 +		switch(intfmt) {
    1.50 +		case 3:
    1.51 +		case GL_RGB:
    1.52 +			intfmt = GL_SRGB_EXT;
    1.53 +			break;
    1.54 +		case 4:
    1.55 +		case GL_RGBA:
    1.56 +			intfmt = GL_SRGB_ALPHA;
    1.57 +			break;
    1.58 +		case 1:
    1.59 +		case GL_LUMINANCE:
    1.60 +			intfmt = GL_SLUMINANCE;
    1.61 +			break;
    1.62 +		default:
    1.63 +			break;
    1.64 +		}
    1.65 +	}
    1.66 +
    1.67 +	width = img.width;
    1.68 +	height = img.height;
    1.69 +	tex_width = next_pow2(width);
    1.70 +	tex_height = next_pow2(height);
    1.71 +
    1.72 +	if(!tex) {
    1.73 +		glGenTextures(1, &tex);
    1.74 +	}
    1.75 +	glBindTexture(GL_TEXTURE_2D, tex);
    1.76 +
    1.77 +	if(GLEW_SGIS_generate_mipmap) {
    1.78 +		glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
    1.79 +	} else {
    1.80 +		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    1.81 +	}
    1.82 +
    1.83 +	glTexImage2D(GL_TEXTURE_2D, 0, intfmt, tex_width, tex_height, 0, pixfmt, pixtype, 0);
    1.84 +	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, pixfmt, pixtype, img.pixels);
    1.85 +
    1.86 +	tmat.scaling((float)width / (float)tex_width, (float)height / (float)tex_height, 1);
    1.87 +	return true;
    1.88 +}
    1.89 +
    1.90 +const Mat4 &Texture::texture_matrix() const
    1.91 +{
    1.92 +	return tmat;
    1.93 +}
    1.94 +
    1.95 +void Texture::bind(bool loadmat) const
    1.96 +{
    1.97 +	if(!tex) return;
    1.98 +
    1.99 +	if(loadmat) {
   1.100 +		glMatrixMode(GL_TEXTURE);
   1.101 +		glLoadMatrixf(tmat[0]);
   1.102 +		glMatrixMode(GL_MODELVIEW);
   1.103 +	}
   1.104 +
   1.105 +	glBindTexture(GL_TEXTURE_2D, tex);
   1.106 +}