1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/texture.cc	Sat Feb 01 19:58:19 2014 +0200
     1.3 @@ -0,0 +1,437 @@
     1.4 +#include <math.h>
     1.5 +#include "texture.h"
     1.6 +#include "image.h"
     1.7 +#include "opengl.h"
     1.8 +#include "imago2.h"
     1.9 +#include "logger.h"
    1.10 +#include "datapath.h"
    1.11 +
    1.12 +static int glifmt_from_ifmt(unsigned int ifmt);
    1.13 +static int glfmt_from_ifmt(unsigned int ifmt);
    1.14 +static int gltype_from_ifmt(unsigned int ifmt);
    1.15 +
    1.16 +static int glifmt_from_imgfmt(Image::Format fmt);
    1.17 +
    1.18 +static unsigned int cur_target[8] = {
    1.19 +	GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D,
    1.20 +	GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D
    1.21 +};
    1.22 +
    1.23 +void set_texture(Texture *tex, int tunit)
    1.24 +{
    1.25 +	if(tex) {
    1.26 +		tex->bind(tunit);
    1.27 +	} else {
    1.28 +		glActiveTexture(GL_TEXTURE0 + tunit);
    1.29 +		glBindTexture(cur_target[tunit], 0);
    1.30 +		glActiveTexture(GL_TEXTURE0);
    1.31 +	}
    1.32 +}
    1.33 +
    1.34 +Texture *load_texture(const char *fname)
    1.35 +{
    1.36 +	TextureCube *texcube = new TextureCube;
    1.37 +	if(texcube->load(fname)) {
    1.38 +		return texcube;
    1.39 +	}
    1.40 +	delete texcube;
    1.41 +
    1.42 +	Texture2D *tex = new Texture2D;
    1.43 +	if(tex->load(fname)) {
    1.44 +		return tex;
    1.45 +	}
    1.46 +	delete tex;
    1.47 +	return 0;
    1.48 +}
    1.49 +
    1.50 +Texture::Texture()
    1.51 +{
    1.52 +	target = 0;
    1.53 +	sz[0] = sz[1] = sz[2] = 0;
    1.54 +	texfmt = 0;
    1.55 +
    1.56 +	glGenTextures(1, &id);
    1.57 +}
    1.58 +
    1.59 +Texture::~Texture()
    1.60 +{
    1.61 +	if(id) {
    1.62 +		glDeleteTextures(1, &id);
    1.63 +	}
    1.64 +}
    1.65 +
    1.66 +void Texture::set_wrapping(unsigned int wrap)
    1.67 +{
    1.68 +	if(!target) {
    1.69 +		return;
    1.70 +	}
    1.71 +
    1.72 +	glBindTexture(target, id);
    1.73 +	glTexParameteri(target, GL_TEXTURE_WRAP_S, wrap);
    1.74 +	glTexParameteri(target, GL_TEXTURE_WRAP_T, wrap);
    1.75 +}
    1.76 +
    1.77 +void Texture::set_filtering(unsigned int filt)
    1.78 +{
    1.79 +	unsigned int mag_filter;
    1.80 +
    1.81 +	if(!target) {
    1.82 +		return;
    1.83 +	}
    1.84 +
    1.85 +	switch(filt) {
    1.86 +	case GL_LINEAR_MIPMAP_NEAREST:
    1.87 +	case GL_LINEAR_MIPMAP_LINEAR:
    1.88 +		mag_filter = GL_LINEAR;
    1.89 +		break;
    1.90 +
    1.91 +	case GL_NEAREST_MIPMAP_NEAREST:
    1.92 +	case GL_NEAREST_MIPMAP_LINEAR:
    1.93 +		mag_filter = GL_NEAREST;
    1.94 +		break;
    1.95 +
    1.96 +	default:
    1.97 +		mag_filter = filt;
    1.98 +	}
    1.99 +
   1.100 +	set_filtering(filt, mag_filter);
   1.101 +}
   1.102 +
   1.103 +void Texture::set_filtering(unsigned int min_filt, unsigned int mag_filt)
   1.104 +{
   1.105 +	glBindTexture(target, id);
   1.106 +	glTexParameteri(target, GL_TEXTURE_MIN_FILTER, min_filt);
   1.107 +	glTexParameteri(target, GL_TEXTURE_MAG_FILTER, mag_filt);
   1.108 +}
   1.109 +
   1.110 +unsigned int Texture::get_format() const
   1.111 +{
   1.112 +	return texfmt;
   1.113 +}
   1.114 +
   1.115 +int Texture::get_size(int dim) const
   1.116 +{
   1.117 +	if(dim < 0 || dim >= 3) {
   1.118 +		return 0;
   1.119 +	}
   1.120 +	return sz[dim];
   1.121 +}
   1.122 +
   1.123 +unsigned int Texture::get_id() const
   1.124 +{
   1.125 +	return id;
   1.126 +}
   1.127 +
   1.128 +void Texture::bind(int tex_unit) const
   1.129 +{
   1.130 +	glActiveTexture(GL_TEXTURE0 + tex_unit);
   1.131 +	glBindTexture(target, id);
   1.132 +	glActiveTexture(GL_TEXTURE0);
   1.133 +
   1.134 +	cur_target[tex_unit] = target;
   1.135 +}
   1.136 +
   1.137 +
   1.138 +// ---- Texture2D ----
   1.139 +
   1.140 +Texture2D::Texture2D()
   1.141 +{
   1.142 +	target = GL_TEXTURE_2D;
   1.143 +}
   1.144 +
   1.145 +void Texture2D::create(int xsz, int ysz, unsigned int ifmt)
   1.146 +{
   1.147 +	int fmt = glfmt_from_ifmt(ifmt);
   1.148 +	int type = gltype_from_ifmt(ifmt);
   1.149 +
   1.150 +	glBindTexture(GL_TEXTURE_2D, id);
   1.151 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   1.152 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
   1.153 +	glTexImage2D(GL_TEXTURE_2D, 0, glifmt_from_ifmt(ifmt), xsz, ysz, 0, fmt, type, 0);
   1.154 +	CHECKGLERR;
   1.155 +	sz[0] = xsz;
   1.156 +	sz[1] = ysz;
   1.157 +	texfmt = ifmt;
   1.158 +}
   1.159 +
   1.160 +void Texture2D::set_image(const Image &img, int idx)
   1.161 +{
   1.162 +	texfmt = glifmt_from_imgfmt(img.get_format());
   1.163 +	unsigned int fmt = glfmt_from_ifmt(texfmt);
   1.164 +	unsigned int type = gltype_from_ifmt(texfmt);
   1.165 +
   1.166 +	sz[0] = img.get_width();
   1.167 +	sz[1] = img.get_height();
   1.168 +
   1.169 +	glBindTexture(GL_TEXTURE_2D, id);
   1.170 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
   1.171 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
   1.172 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
   1.173 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
   1.174 +
   1.175 +#ifdef __GLEW_H__
   1.176 +	if(GLEW_SGIS_generate_mipmap) {
   1.177 +		glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
   1.178 +#endif
   1.179 +		glTexImage2D(GL_TEXTURE_2D, 0, texfmt, sz[0], sz[1], 0, fmt, type, img.get_pixels());
   1.180 +#ifdef __GLEW_H__
   1.181 +	} else {
   1.182 +		gluBuild2DMipmaps(GL_TEXTURE_2D, texfmt, sz[0], sz[1], fmt, type, img.get_pixels());
   1.183 +	}
   1.184 +#endif
   1.185 +
   1.186 +#ifdef GL_ES_VERSION_2_0
   1.187 +	glGenerateMipmap(GL_TEXTURE_2D);
   1.188 +#endif
   1.189 +}
   1.190 +
   1.191 +bool Texture2D::load(const char *fname)
   1.192 +{
   1.193 +	Image img;
   1.194 +	if(!img.load(fname)) {
   1.195 +		error_log("failed to load 2D texture: %s\n", fname);
   1.196 +		return false;
   1.197 +	}
   1.198 +	set_image(img);
   1.199 +
   1.200 +	info_log("loaded 2D texture: %s\n", fname);
   1.201 +	return true;
   1.202 +}
   1.203 +
   1.204 +bool Texture2D::save(const char *fname) const
   1.205 +{
   1.206 +#ifndef GL_ES_VERSION_2_0
   1.207 +	unsigned char *pixels = new unsigned char[sz[0] * sz[1] * 4];
   1.208 +
   1.209 +	glBindTexture(GL_TEXTURE_2D, id);
   1.210 +	glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
   1.211 +
   1.212 +	if(img_save_pixels(fname, pixels, sz[0], sz[1]) == -1) {
   1.213 +		error_log("failed to save 2D texture: %s\n", fname);
   1.214 +		delete [] pixels;
   1.215 +		return false;
   1.216 +	}
   1.217 +
   1.218 +	info_log("saved 2D texture: %s\n", fname);
   1.219 +	delete [] pixels;
   1.220 +	return true;
   1.221 +#else
   1.222 +	return false;	// TODO
   1.223 +#endif
   1.224 +}
   1.225 +
   1.226 +// ---- TextureCube ----
   1.227 +static unsigned int cube_faces[] = {
   1.228 +	GL_TEXTURE_CUBE_MAP_POSITIVE_X,
   1.229 +	GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
   1.230 +	GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
   1.231 +	GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
   1.232 +	GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
   1.233 +	GL_TEXTURE_CUBE_MAP_NEGATIVE_Z
   1.234 +};
   1.235 +
   1.236 +TextureCube::TextureCube()
   1.237 +{
   1.238 +	target = GL_TEXTURE_CUBE_MAP;
   1.239 +}
   1.240 +
   1.241 +void TextureCube::create(int xsz, int ysz, unsigned int ifmt)
   1.242 +{
   1.243 +	if(xsz != ysz) {
   1.244 +		error_log("trying to create cubemap with different width and height (%dx%d)\n", xsz, ysz);
   1.245 +		return;
   1.246 +	}
   1.247 +
   1.248 +	texfmt = ifmt;
   1.249 +
   1.250 +	glBindTexture(GL_TEXTURE_CUBE_MAP, id);
   1.251 +	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   1.252 +	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
   1.253 +	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   1.254 +	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
   1.255 +	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
   1.256 +
   1.257 +	for(int i=0; i<6; i++) {
   1.258 +		glTexImage2D(cube_faces[i], 0, ifmt, xsz, ysz, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
   1.259 +	}
   1.260 +}
   1.261 +
   1.262 +void TextureCube::set_image(const Image &img, int idx)
   1.263 +{
   1.264 +	texfmt = glifmt_from_imgfmt(img.get_format());
   1.265 +	unsigned int fmt = glfmt_from_ifmt(texfmt);
   1.266 +	unsigned int type = gltype_from_ifmt(texfmt);
   1.267 +
   1.268 +	sz[0] = img.get_width();
   1.269 +	sz[1] = img.get_height();
   1.270 +
   1.271 +	glBindTexture(GL_TEXTURE_CUBE_MAP, id);
   1.272 +	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   1.273 +	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
   1.274 +	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   1.275 +	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
   1.276 +	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
   1.277 +
   1.278 +	glTexImage2D(cube_faces[idx], 0, texfmt, sz[0], sz[1], 0, fmt, type, img.get_pixels());
   1.279 +}
   1.280 +
   1.281 +bool TextureCube::load(const char *fname)
   1.282 +{
   1.283 +	static const float one_third = 1.0 / 3.0;
   1.284 +	static const float two_thirds = 2.0 / 3.0;
   1.285 +	static const float hcross[2][6] = {
   1.286 +		{0.5, 0.0, 0.25, 0.25, 0.25, 0.75}, {one_third, one_third, 0.0, two_thirds, one_third, one_third} };
   1.287 +	static const float vcross[2][6] = {
   1.288 +		{two_thirds, 0.0, one_third, one_third, one_third, one_third}, {0.25, 0.25, 0.0, 0.5, 0.25, 0.75} };
   1.289 +	static const float hsix[2][6] = {
   1.290 +		{0.0, 0.0, one_third, one_third, two_thirds, two_thirds}, {0.0, 0.5, 0.0, 0.5, 0.0, 0.5} };
   1.291 +
   1.292 +	Image img;
   1.293 +	if(!img.load(fname)) {
   1.294 +		return false;
   1.295 +	}
   1.296 +
   1.297 +	int xsz = img.get_width();
   1.298 +	int ysz = img.get_height();
   1.299 +
   1.300 +	if(xsz / 4 == ysz / 3) {
   1.301 +		// horizontal cross, assume the vertical bit is center-left
   1.302 +		return load_multi(img, hcross[0], hcross[1], xsz / 4);
   1.303 +	}
   1.304 +	if(xsz / 3 == ysz / 4) {
   1.305 +		// vertical cross, assume the horizontal bit is center-top (180-rotated image 5)
   1.306 +		return load_multi(img, vcross[0], vcross[1], ysz / 4, (1 << 5));
   1.307 +	}
   1.308 +	if(xsz / 3 == ysz / 2) {
   1.309 +		// horizontal sixpack
   1.310 +		return load_multi(img, hsix[0], hsix[1], ysz / 2);
   1.311 +	}
   1.312 +
   1.313 +	error_log("failed to load %s: unknown cubemap configuration\n", fname);
   1.314 +	return false;
   1.315 +}
   1.316 +
   1.317 +bool TextureCube::save(const char *fname) const
   1.318 +{
   1.319 +	return false;	// TODO
   1.320 +}
   1.321 +
   1.322 +bool TextureCube::load_multi(const Image &img, const float *xoffsets, const float *yoffsets, float sz,
   1.323 +		unsigned int rotmask)
   1.324 +{
   1.325 +	for(int i=0; i<6; i++) {
   1.326 +		Image face;
   1.327 +
   1.328 +		int xoffs = xoffsets[i] * img.get_width();
   1.329 +		int yoffs = yoffsets[i] * img.get_height();
   1.330 +
   1.331 +		if(!face.set_pixels(sz, sz, img.get_pixels(), xoffs, yoffs, img.get_width(), img.get_format())) {
   1.332 +			return false;
   1.333 +		}
   1.334 +
   1.335 +		if(rotmask & (1 << i)) {
   1.336 +			face.rotate_180();
   1.337 +		}
   1.338 +		set_image(face, i);
   1.339 +	}
   1.340 +	return true;
   1.341 +}
   1.342 +
   1.343 +static int glifmt_from_ifmt(unsigned int ifmt)
   1.344 +{
   1.345 +#ifdef GL_ES_VERSION_2_0
   1.346 +	switch(ifmt) {
   1.347 +	case GL_LUMINANCE16F:
   1.348 +	case GL_LUMINANCE32F:
   1.349 +		ifmt = GL_LUMINANCE;
   1.350 +		break;
   1.351 +
   1.352 +	case GL_RGB16F:
   1.353 +	case GL_RGB32F:
   1.354 +		ifmt = GL_RGB;
   1.355 +		break;
   1.356 +
   1.357 +	case GL_RGBA16F:
   1.358 +	case GL_RGBA32F:
   1.359 +		ifmt = GL_RGBA;
   1.360 +		break;
   1.361 +
   1.362 +	default:
   1.363 +		break;
   1.364 +	}
   1.365 +#endif
   1.366 +	return ifmt;	// by default just pass it through...
   1.367 +}
   1.368 +
   1.369 +static int glfmt_from_ifmt(unsigned int ifmt)
   1.370 +{
   1.371 +	switch(ifmt) {
   1.372 +	case GL_LUMINANCE16F:
   1.373 +	case GL_LUMINANCE32F:
   1.374 +		return GL_LUMINANCE;
   1.375 +
   1.376 +	case GL_RGB16F:
   1.377 +	case GL_RGB32F:
   1.378 +		return GL_RGB;
   1.379 +
   1.380 +	case GL_RGBA16F:
   1.381 +	case GL_RGBA32F:
   1.382 +		return GL_RGBA;
   1.383 +
   1.384 +	default:
   1.385 +		break;
   1.386 +	}
   1.387 +	return ifmt;
   1.388 +}
   1.389 +
   1.390 +static int gltype_from_ifmt(unsigned int ifmt)
   1.391 +{
   1.392 +	switch(ifmt) {
   1.393 +	case GL_RGB16F:
   1.394 +	case GL_RGBA16F:
   1.395 +	case GL_LUMINANCE16F:
   1.396 +#ifdef GL_ES_VERSION_2_0
   1.397 +		return GL_HALF_FLOAT_OES;
   1.398 +#endif
   1.399 +	case GL_RGB32F:
   1.400 +	case GL_RGBA32F:
   1.401 +	case GL_LUMINANCE32F:
   1.402 +		return GL_FLOAT;
   1.403 +
   1.404 +	default:
   1.405 +		break;
   1.406 +	}
   1.407 +	return GL_UNSIGNED_BYTE;
   1.408 +}
   1.409 +
   1.410 +static int glifmt_from_imgfmt(Image::Format fmt)
   1.411 +{
   1.412 +	switch(fmt) {
   1.413 +	case Image::FMT_GREY:
   1.414 +		return GL_LUMINANCE;
   1.415 +	case Image::FMT_GREY_FLOAT:
   1.416 +		return GL_LUMINANCE16F;
   1.417 +	case Image::FMT_RGB:
   1.418 +		return GL_RGB;
   1.419 +	case Image::FMT_RGB_FLOAT:
   1.420 +		return GL_RGB16F;
   1.421 +	case Image::FMT_RGBA:
   1.422 +		return GL_RGBA;
   1.423 +	case Image::FMT_RGBA_FLOAT:
   1.424 +		return GL_RGBA16F;
   1.425 +	default:
   1.426 +		break;
   1.427 +	}
   1.428 +	return 0;
   1.429 +}
   1.430 +
   1.431 +// ---- TextureSet ----
   1.432 +static void destroy_texture(Texture *tex)
   1.433 +{
   1.434 +	delete tex;
   1.435 +}
   1.436 +
   1.437 +TextureSet::TextureSet()
   1.438 +	: DataSet<Texture*>(load_texture, destroy_texture)
   1.439 +{
   1.440 +}