+#include <math.h>
+#include <assert.h>
+#include "texture.h"
+#include "image.h"
+#include "opengl.h"
+#include "imago2.h"
+
+static int glifmt_from_ifmt(unsigned int ifmt);
+static int glfmt_from_ifmt(unsigned int ifmt);
+static int gltype_from_ifmt(unsigned int ifmt);
+
+static int glifmt_from_imgfmt(Image::Format fmt);
+
+static unsigned int type_to_target(TextureType type);
+static TextureType target_to_type(unsigned int targ);
+
+static unsigned int cur_target[8] = {
+ GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D,
+ GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D
+};
+
+static unsigned int cube_faces[] = {
+ GL_TEXTURE_CUBE_MAP_POSITIVE_X,
+ GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
+ GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
+ GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
+ GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
+ GL_TEXTURE_CUBE_MAP_NEGATIVE_Z
+};
+
+
+void bind_texture(Texture *tex, int tunit)
+{
+ if(tex) {
+ tex->bind(tunit);
+ } else {
+ glActiveTexture(GL_TEXTURE0 + tunit);
+ glBindTexture(cur_target[tunit], 0);
+ assert(glGetError() == GL_NO_ERROR);
+ glActiveTexture(GL_TEXTURE0);
+ }
+}
+
+Image *Texture::default_img;
+
+Texture::Texture()
+{
+ target = 0;
+ sz[0] = sz[1] = sz[2] = 0;
+ texfmt = 0;
+
+ img = 0;
+ glGenTextures(1, &id);
+}
+
+Texture::~Texture()
+{
+ if(id) {
+ glDeleteTextures(1, &id);
+ }
+ if(img) {
+ delete img;
+ }
+}
+
+void Texture::set_wrapping(unsigned int wrap)
+{
+ if(!target) {
+ return;
+ }
+
+ glBindTexture(target, id);
+ assert(glGetError() == GL_NO_ERROR);
+ glTexParameteri(target, GL_TEXTURE_WRAP_S, wrap);
+ glTexParameteri(target, GL_TEXTURE_WRAP_T, wrap);
+ glTexParameteri(target, GL_TEXTURE_WRAP_R, wrap);
+}
+
+void Texture::set_filtering(unsigned int filt)
+{
+ unsigned int mag_filter;
+
+ if(!target) {
+ return;
+ }
+
+ switch(filt) {
+ case GL_LINEAR_MIPMAP_NEAREST:
+ case GL_LINEAR_MIPMAP_LINEAR:
+ mag_filter = GL_LINEAR;
+ break;
+
+ case GL_NEAREST_MIPMAP_NEAREST:
+ case GL_NEAREST_MIPMAP_LINEAR:
+ mag_filter = GL_NEAREST;
+ break;
+
+ default:
+ mag_filter = filt;
+ }
+
+ set_filtering(filt, mag_filter);
+}
+
+void Texture::set_filtering(unsigned int min_filt, unsigned int mag_filt)
+{
+ glBindTexture(target, id);
+ assert(glGetError() == GL_NO_ERROR);
+ glTexParameteri(target, GL_TEXTURE_MIN_FILTER, min_filt);
+ glTexParameteri(target, GL_TEXTURE_MAG_FILTER, mag_filt);
+}
+
+void Texture::set_anisotropy(int aniso)
+{
+ if(aniso > glcaps.max_aniso) {
+ aniso = glcaps.max_aniso;
+ }
+
+ glBindTexture(target, id);
+ glTexParameteri(target, GL_TEXTURE_MAX_ANISOTROPY_EXT, aniso);
+}
+
+unsigned int Texture::get_format() const
+{
+ return texfmt;
+}
+
+int Texture::get_size(int dim) const
+{
+ if(dim < 0 || dim >= 3) {
+ return 0;
+ }
+ return sz[dim];
+}
+
+int Texture::get_width() const
+{
+ return sz[0];
+}
+
+int Texture::get_height() const
+{
+ return sz[1];
+}
+
+unsigned int Texture::get_id() const
+{
+ return id;
+}
+
+TextureType Texture::get_type() const
+{
+ return target_to_type(target);
+}
+
+void Texture::bind(int tex_unit) const
+{
+ glActiveTexture(GL_TEXTURE0 + tex_unit);
+ glBindTexture(target, id);
+ assert(glGetError() == GL_NO_ERROR);
+ glActiveTexture(GL_TEXTURE0);
+
+ cur_target[tex_unit] = target;
+}
+
+
+void Texture::create(int xsz, int ysz, TextureType textype, unsigned int ifmt)
+{
+ if(textype == TEX_CUBE && xsz != ysz) {
+ fprintf(stderr, "trying to create cubemap with different width and height (%dx%d)\n", xsz, ysz);
+ return;
+ }
+
+ int fmt = glfmt_from_ifmt(ifmt);
+ int type = gltype_from_ifmt(ifmt);
+
+ target = type_to_target(textype);
+
+ glBindTexture(target, id);
+ assert(glGetError() == GL_NO_ERROR);
+ glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+ switch(textype) {
+ case TEX_2D:
+ glTexImage2D(GL_TEXTURE_2D, 0, glifmt_from_ifmt(ifmt), xsz, ysz, 0, fmt, type, 0);
+ break;
+
+ case TEX_CUBE:
+ glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+ glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+ glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
+ for(int i=0; i<6; i++) {
+ glTexImage2D(cube_faces[i], 0, ifmt, xsz, ysz, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
+ }
+ break;
+ }
+
+ sz[0] = xsz;
+ sz[1] = ysz;
+ texfmt = ifmt;
+}
+
+#define DEF_IMAGE_SIZE 64
+void Texture::create_default(TextureType type)
+{
+ if(!default_img) {
+ default_img = new Image;
+ default_img->create(DEF_IMAGE_SIZE, DEF_IMAGE_SIZE, Image::FMT_RGBA);
+
+ unsigned char *pixels = (unsigned char*)default_img->get_pixels();
+ for(int i=0; i<DEF_IMAGE_SIZE; i++) {
+ for(int j=0; j<DEF_IMAGE_SIZE; j++) {
+ bool chess = ((i >> 3) & 1) == ((j >> 3) & 1);
+ pixels[0] = chess ? 255 : 32;
+ pixels[1] = 64;
+ pixels[2] = chess ? 32 : 255;
+ pixels[3] = 255;
+ pixels += 4;
+ }
+ }
+ }
+
+ switch(type) {
+ case TEX_2D:
+ set_image(*default_img);
+ break;
+
+ case TEX_CUBE:
+ for(int i=0; i<6; i++) {
+ set_image(*default_img, i);
+ }
+ break;
+ }
+}
+
+void Texture::set_image(const Image &img, int idx)
+{
+ if(idx >= 0 && idx < 6) {
+ set_image_cube(img, idx);
+ } else {
+ if(!set_image_cube(img)) {
+ set_image_2d(img);
+ }
+ }
+}
+
+void Texture::set_image_2d(const Image &img)
+{
+ texfmt = glifmt_from_imgfmt(img.get_format());
+ unsigned int fmt = glfmt_from_ifmt(texfmt);
+ unsigned int type = gltype_from_ifmt(texfmt);
+
+ sz[0] = img.get_width();
+ sz[1] = img.get_height();
+
+ target = GL_TEXTURE_2D;
+ glBindTexture(target, id);
+ assert(glGetError() == GL_NO_ERROR);
+ glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+ glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_REPEAT);
+ glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+#ifdef __GLEW_H__
+ if(GLEW_SGIS_generate_mipmap) {
+ glTexParameteri(target, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
+#endif
+ glTexImage2D(target, 0, texfmt, sz[0], sz[1], 0, fmt, type, img.get_pixels());
+#ifdef __GLEW_H__
+ } else {
+ gluBuild2DMipmaps(target, texfmt, sz[0], sz[1], fmt, type, img.get_pixels());
+ }
+#endif
+
+#ifdef GL_ES_VERSION_2_0
+ glGenerateMipmap(target);
+#endif
+}
+
+bool Texture::set_image_cube(const Image &img, int idx)
+{
+ unsigned int err;
+ if(idx < 0 || idx >= 6) {
+ return false;
+ }
+
+ texfmt = glifmt_from_imgfmt(img.get_format());
+ unsigned int fmt = glfmt_from_ifmt(texfmt);
+ unsigned int type = gltype_from_ifmt(texfmt);
+
+ sz[0] = img.get_width();
+ sz[1] = img.get_height();
+
+ target = GL_TEXTURE_CUBE_MAP;
+ glBindTexture(target, id);
+ if((err = glGetError()) == GL_INVALID_OPERATION) {
+ return false; // probably not a cubemap
+ }
+ assert(err == GL_NO_ERROR);
+ glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+ glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+ glTexParameteri(target, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
+
+ glTexImage2D(cube_faces[idx], 0, texfmt, sz[0], sz[1], 0, fmt, type, img.get_pixels());
+ return true;
+}
+
+bool Texture::set_image_cube(const Image &img)
+{
+ static const float one_third = 1.0 / 3.0;
+ static const float two_thirds = 2.0 / 3.0;
+ static const float hcross[2][6] = {
+ {0.5, 0.0, 0.25, 0.25, 0.25, 0.75}, {one_third, one_third, 0.0, two_thirds, one_third, one_third} };
+ static const float vcross[2][6] = {
+ {two_thirds, 0.0, one_third, one_third, one_third, one_third}, {0.25, 0.25, 0.0, 0.5, 0.25, 0.75} };
+ static const float hsix[2][6] = {
+ {0.0, 0.0, one_third, one_third, two_thirds, two_thirds}, {0.0, 0.5, 0.0, 0.5, 0.0, 0.5} };
+
+ int xsz = img.get_width();
+ int ysz = img.get_height();
+
+ if((xsz << 8) / 4 == (ysz << 8) / 3) {
+ // horizontal cross, assume the vertical bit is center-left
+ return set_cube_multi(img, hcross[0], hcross[1], xsz / 4);
+ }
+ if((xsz << 8) / 3 == (ysz << 8) / 4) {
+ // vertical cross, assume the horizontal bit is center-top (180-rotated image 5)
+ return set_cube_multi(img, vcross[0], vcross[1], ysz / 4, (1 << 5));
+ }
+ if((xsz << 8) / 3 == (ysz << 8) / 2) {
+ // horizontal sixpack
+ return set_cube_multi(img, hsix[0], hsix[1], ysz / 2);
+ }
+
+ return false;
+}
+
+
+bool Texture::load(const char *fname)
+{
+ Image img;
+ if(!img.load(fname)) {
+ fprintf(stderr, "failed to load 2D texture: %s\n", fname);
+ return false;
+ }
+ set_image(img);
+
+ printf("loaded 2D texture: %s\n", fname);
+ return true;
+}
+
+bool Texture::load_cube(const char *fname)
+{
+ Image img;
+ if(!img.load(fname)) {
+ return false;
+ }
+ return set_image_cube(img);
+}
+
+bool Texture::set_cube_multi(const Image &img, const float *xoffsets, const float *yoffsets, float sz,
+ unsigned int rotmask)
+{
+ for(int i=0; i<6; i++) {
+ Image face;
+
+ int xoffs = xoffsets[i] * img.get_width();
+ int yoffs = yoffsets[i] * img.get_height();
+
+ if(!face.set_pixels(sz, sz, img.get_pixels(), xoffs, yoffs, img.get_width(), img.get_format())) {
+ return false;
+ }
+
+ if(rotmask & (1 << i)) {
+ face.rotate_180();
+ }
+ set_image_cube(face, i);
+ }
+ return true;
+}
+
+static int glifmt_from_ifmt(unsigned int ifmt)
+{
+#ifdef GL_ES_VERSION_2_0
+ switch(ifmt) {
+ case GL_LUMINANCE16F_ARB:
+ case GL_LUMINANCE32F_ARB:
+ ifmt = GL_LUMINANCE;
+ break;
+
+ case GL_RGB16F:
+ case GL_RGB32F:
+ ifmt = GL_RGB;
+ break;
+
+ case GL_RGBA16F:
+ case GL_RGBA32F:
+ ifmt = GL_RGBA;
+ break;
+
+ default:
+ break;
+ }
+#endif
+ return ifmt; // by default just pass it through...
+}
+
+static int glfmt_from_ifmt(unsigned int ifmt)
+{
+ switch(ifmt) {
+ case GL_LUMINANCE16F_ARB:
+ case GL_LUMINANCE32F_ARB:
+ case GL_SLUMINANCE:
+ return GL_LUMINANCE;
+
+ case GL_RGB16F:
+ case GL_RGB32F:
+ case GL_SRGB:
+ return GL_RGB;
+
+ case GL_RGBA16F:
+ case GL_RGBA32F:
+ case GL_SRGB_ALPHA:
+ return GL_RGBA;
+
+ default:
+ break;
+ }
+ return ifmt;
+}
+
+static int gltype_from_ifmt(unsigned int ifmt)
+{
+ switch(ifmt) {
+ case GL_RGB16F:
+ case GL_RGBA16F:
+ case GL_LUMINANCE16F_ARB:
+#ifdef GL_ES_VERSION_2_0
+ return GL_HALF_FLOAT_OES;
+#endif
+ case GL_RGB32F:
+ case GL_RGBA32F:
+ case GL_LUMINANCE32F_ARB:
+ return GL_FLOAT;
+
+ default:
+ break;
+ }
+ return GL_UNSIGNED_BYTE;
+}
+
+static int glifmt_from_imgfmt(Image::Format fmt)
+{
+ switch(fmt) {
+ case Image::FMT_GREY:
+ return GL_SLUMINANCE;
+ case Image::FMT_GREY_FLOAT:
+ return GL_LUMINANCE16F_ARB;
+ case Image::FMT_RGB:
+ return GL_SRGB;
+ case Image::FMT_RGB_FLOAT:
+ return GL_RGB16F;
+ case Image::FMT_RGBA:
+ return GL_SRGB_ALPHA;
+ case Image::FMT_RGBA_FLOAT:
+ return GL_RGBA16F;
+ default:
+ break;
+ }
+ return 0;
+}
+
+static unsigned int type_to_target(TextureType type)
+{
+ return type == TEX_CUBE ? GL_TEXTURE_CUBE_MAP : GL_TEXTURE_2D;
+}
+
+static TextureType target_to_type(unsigned int targ)
+{
+ return targ == GL_TEXTURE_CUBE_MAP ? TEX_CUBE : TEX_2D;
+}
projects / ld42_outofspace / commitdiff