1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/image.cc	Thu Jun 25 05:58:35 2015 +0300
     1.3 @@ -0,0 +1,228 @@
     1.4 +#include <string.h>
     1.5 +#include "opengl.h"
     1.6 +#include "image.h"
     1.7 +#include "imago2.h"
     1.8 +
     1.9 +
    1.10 +static unsigned int next_pow2(unsigned int x);
    1.11 +
    1.12 +Image::Image()
    1.13 +{
    1.14 +	width = height = tex_width = tex_height = 0;
    1.15 +	pixels = 0;
    1.16 +	tex = 0;
    1.17 +	tex_valid = false;
    1.18 +}
    1.19 +
    1.20 +Image::~Image()
    1.21 +{
    1.22 +	destroy();
    1.23 +}
    1.24 +
    1.25 +Image::Image(const Image &img)
    1.26 +{
    1.27 +	pixels = 0;
    1.28 +	create(img.width, img.height, img.pixels);
    1.29 +}
    1.30 +
    1.31 +Image &Image::operator =(const Image &img)
    1.32 +{
    1.33 +	if(&img != this) {
    1.34 +		create(img.width, img.height, img.pixels);
    1.35 +	}
    1.36 +	return *this;
    1.37 +}
    1.38 +
    1.39 +bool Image::create(int width, int height, unsigned char *pixels)
    1.40 +{
    1.41 +	destroy();
    1.42 +
    1.43 +	try {
    1.44 +		unsigned char *tmp = new unsigned char[width * height * 3];
    1.45 +		this->pixels = tmp;
    1.46 +		this->width = width;
    1.47 +		this->height = height;
    1.48 +	}
    1.49 +	catch(...) {
    1.50 +		return false;
    1.51 +	}
    1.52 +
    1.53 +	if(pixels) {
    1.54 +		memcpy(this->pixels, pixels, width * height * 3);
    1.55 +	}
    1.56 +	return true;
    1.57 +}
    1.58 +
    1.59 +void Image::destroy()
    1.60 +{
    1.61 +	delete [] pixels;
    1.62 +	pixels = 0;
    1.63 +	width = height = 0;
    1.64 +
    1.65 +	if(tex) {
    1.66 +		glDeleteTextures(1, &tex);
    1.67 +		tex = 0;
    1.68 +		tex_valid = false;
    1.69 +	}
    1.70 +}
    1.71 +
    1.72 +bool Image::load(const char *fname)
    1.73 +{
    1.74 +	int xsz, ysz;
    1.75 +	unsigned char *pix = (unsigned char*)img_load_pixels(fname, &xsz, &ysz, IMG_FMT_RGB24);
    1.76 +	if(!pix) {
    1.77 +		return false;
    1.78 +	}
    1.79 +	return create(xsz, ysz, pix);
    1.80 +}
    1.81 +
    1.82 +unsigned int Image::texture() const
    1.83 +{
    1.84 +	if(!pixels) {
    1.85 +		return 0;
    1.86 +	}
    1.87 +	if(!tex) {
    1.88 +		glGenTextures(1, &tex);
    1.89 +	}
    1.90 +
    1.91 +	if(!tex_valid) {
    1.92 +		tex_width = next_pow2(width);
    1.93 +		tex_height = next_pow2(height);
    1.94 +
    1.95 +		glBindTexture(GL_TEXTURE_2D, tex);
    1.96 +		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
    1.97 +		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    1.98 +
    1.99 +		if(GLEW_SGIS_generate_mipmap) {
   1.100 +			glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, 1);
   1.101 +
   1.102 +			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, tex_width, tex_height, 0, GL_RGB, GL_UNSIGNED_BYTE,
   1.103 +					width == tex_width && height == tex_height ? pixels : 0);
   1.104 +			if(width != tex_width || height != tex_height) {
   1.105 +				glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, pixels);
   1.106 +			}
   1.107 +		} else {
   1.108 +			gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGB, tex_width, tex_height, GL_RGB, GL_UNSIGNED_BYTE, pixels);
   1.109 +		}
   1.110 +
   1.111 +		if(GLEW_EXT_texture_filter_anisotropic) {
   1.112 +			static float max_aniso = -1.0;
   1.113 +
   1.114 +			if(max_aniso < 0.0) {
   1.115 +				glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &max_aniso);
   1.116 +				printf("using anisotropic filtering: x%g\n", max_aniso);
   1.117 +			}
   1.118 +
   1.119 +			glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, max_aniso);
   1.120 +		}
   1.121 +		tex_valid = true;
   1.122 +	}
   1.123 +	return tex;
   1.124 +}
   1.125 +
   1.126 +int Image::texture_width() const
   1.127 +{
   1.128 +	return tex_width;
   1.129 +}
   1.130 +
   1.131 +int Image::texture_height() const
   1.132 +{
   1.133 +	return tex_height;
   1.134 +}
   1.135 +
   1.136 +void Image::invalidate_texture()
   1.137 +{
   1.138 +	tex_valid = false;
   1.139 +}
   1.140 +
   1.141 +
   1.142 +void clear_image(Image *img)
   1.143 +{
   1.144 +	clear_image(img, 0, 0, 0);
   1.145 +}
   1.146 +
   1.147 +void clear_image(Image *img, float r, float g, float b)
   1.148 +{
   1.149 +	if(!img->pixels) {
   1.150 +		return;
   1.151 +	}
   1.152 +
   1.153 +	unsigned char col[3];
   1.154 +	unsigned char *ptr = img->pixels;
   1.155 +	int npix = img->width * img->height;
   1.156 +
   1.157 +	col[0] = (int)(r * 255.0);
   1.158 +	col[1] = (int)(g * 255.0);
   1.159 +	col[2] = (int)(b * 255.0);
   1.160 +
   1.161 +	for(int i=0; i<npix; i++) {
   1.162 +		for(int j=0; j<3; j++) {
   1.163 +			ptr[j] = col[j];
   1.164 +		}
   1.165 +		ptr += 3;
   1.166 +	}
   1.167 +}
   1.168 +
   1.169 +bool combine_image(Image *dest, const Image *aimg, const Image *bimg, ImgCombine op, float t)
   1.170 +{
   1.171 +	int xsz = dest->width;
   1.172 +	int ysz = dest->height;
   1.173 +	int npixels = xsz * ysz;
   1.174 +	int nbytes = npixels * 3;
   1.175 +	int tint = (int)(t * 255);
   1.176 +
   1.177 +	if(aimg->width != xsz || bimg->width != xsz || aimg->height != ysz || bimg->height != ysz) {
   1.178 +		return false;
   1.179 +	}
   1.180 +
   1.181 +	unsigned char *dptr = dest->pixels;
   1.182 +	const unsigned char *aptr = aimg->pixels;
   1.183 +	const unsigned char *bptr = bimg->pixels;
   1.184 +
   1.185 +	switch(op) {
   1.186 +	case IMG_OP_ADD:
   1.187 +		for(int i=0; i<nbytes; i++) {
   1.188 +			unsigned int x = *aptr++ + *bptr++;
   1.189 +			*dptr++ = x > 255 ? 255 : x;
   1.190 +		}
   1.191 +		break;
   1.192 +
   1.193 +	case IMG_OP_SUB:
   1.194 +		for(int i=0; i<nbytes; i++) {
   1.195 +			int x = (int)*aptr++ - (int)*bptr++;
   1.196 +			*dptr++ = x < 0 ? 0 : x;
   1.197 +		}
   1.198 +		break;
   1.199 +
   1.200 +	case IMG_OP_MUL:
   1.201 +		for(int i=0; i<nbytes; i++) {
   1.202 +			unsigned int x = ((unsigned int)*aptr++ * (unsigned int)*bptr++) >> 8;
   1.203 +			*dptr++ = x > 255 ? 255 : x;
   1.204 +		}
   1.205 +		break;
   1.206 +
   1.207 +	case IMG_OP_LERP:
   1.208 +		for(int i=0; i<nbytes; i++) {
   1.209 +			int x = (int)*aptr + ((((int)*bptr - (int)*aptr) * tint) >> 8);
   1.210 +			*dptr++ = x > 255 ? 255 : (x < 0 ? 0 : x);
   1.211 +		}
   1.212 +		break;
   1.213 +
   1.214 +	default:
   1.215 +		break;
   1.216 +	}
   1.217 +
   1.218 +	dest->invalidate_texture();
   1.219 +	return true;
   1.220 +}
   1.221 +
   1.222 +static unsigned int next_pow2(unsigned int x)
   1.223 +{
   1.224 +	x--;
   1.225 +	x = (x >> 1) | x;
   1.226 +	x = (x >> 2) | x;
   1.227 +	x = (x >> 4) | x;
   1.228 +	x = (x >> 8) | x;
   1.229 +	x = (x >> 16) | x;
   1.230 +	return x + 1;
   1.231 +}