cubemapper

annotate src/texture.cc @ 1:d7a29cb7ac8d

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resize to the final cubemap face size
author John Tsiombikas <nuclear@member.fsf.org>
date Fri, 28 Jul 2017 07:44:35 +0300
parents 8fc9e1d3aad2
children e308561f9889
rev   line source
nuclear@0 1 #include <stdio.h>
nuclear@0 2 #include <imago2.h>
nuclear@0 3 #include "texture.h"
nuclear@0 4 #include "opengl.h"
nuclear@0 5
nuclear@0 6 Texture::Texture()
nuclear@0 7 {
nuclear@0 8 width = height = tex_width = tex_height = 0;
nuclear@0 9 tex = 0;
nuclear@0 10 }
nuclear@0 11
nuclear@0 12 Texture::~Texture()
nuclear@0 13 {
nuclear@0 14 if(tex) {
nuclear@0 15 glDeleteTextures(1, &tex);
nuclear@0 16 }
nuclear@0 17 }
nuclear@0 18
nuclear@0 19 static unsigned int next_pow2(unsigned int x)
nuclear@0 20 {
nuclear@0 21 --x;
nuclear@0 22 x |= x >> 1;
nuclear@0 23 x |= x >> 2;
nuclear@0 24 x |= x >> 4;
nuclear@0 25 x |= x >> 8;
nuclear@0 26 x |= x >> 16;
nuclear@0 27 return x + 1;
nuclear@0 28 }
nuclear@0 29
nuclear@1 30 int Texture::get_width() const
nuclear@1 31 {
nuclear@1 32 return width;
nuclear@1 33 }
nuclear@1 34
nuclear@1 35 int Texture::get_height() const
nuclear@1 36 {
nuclear@1 37 return height;
nuclear@1 38 }
nuclear@1 39
nuclear@0 40 bool Texture::load(const char *fname)
nuclear@0 41 {
nuclear@0 42 img_pixmap img;
nuclear@0 43 img_init(&img);
nuclear@0 44 if(img_load(&img, fname) == -1) {
nuclear@0 45 fprintf(stderr, "failed to load texture: %s\n", fname);
nuclear@0 46 img_destroy(&img);
nuclear@0 47 return false;
nuclear@0 48 }
nuclear@0 49
nuclear@0 50 unsigned int intfmt = img_glintfmt(&img);
nuclear@0 51 unsigned int pixfmt = img_glfmt(&img);
nuclear@0 52 unsigned int pixtype = img_gltype(&img);
nuclear@0 53
nuclear@0 54 // if we have the sRGB extension, change the internal formats to sRGB
nuclear@0 55 if(GLEW_EXT_texture_sRGB) {
nuclear@0 56 switch(intfmt) {
nuclear@0 57 case 3:
nuclear@0 58 case GL_RGB:
nuclear@0 59 intfmt = GL_SRGB_EXT;
nuclear@0 60 break;
nuclear@0 61 case 4:
nuclear@0 62 case GL_RGBA:
nuclear@0 63 intfmt = GL_SRGB_ALPHA;
nuclear@0 64 break;
nuclear@0 65 case 1:
nuclear@0 66 case GL_LUMINANCE:
nuclear@0 67 intfmt = GL_SLUMINANCE;
nuclear@0 68 break;
nuclear@0 69 default:
nuclear@0 70 break;
nuclear@0 71 }
nuclear@0 72 }
nuclear@0 73
nuclear@0 74 width = img.width;
nuclear@0 75 height = img.height;
nuclear@0 76 tex_width = next_pow2(width);
nuclear@0 77 tex_height = next_pow2(height);
nuclear@0 78
nuclear@0 79 if(!tex) {
nuclear@0 80 glGenTextures(1, &tex);
nuclear@0 81 }
nuclear@0 82 glBindTexture(GL_TEXTURE_2D, tex);
nuclear@0 83
nuclear@0 84 if(GLEW_SGIS_generate_mipmap) {
nuclear@0 85 glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
nuclear@0 86 } else {
nuclear@0 87 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@0 88 }
nuclear@0 89
nuclear@0 90 glTexImage2D(GL_TEXTURE_2D, 0, intfmt, tex_width, tex_height, 0, pixfmt, pixtype, 0);
nuclear@0 91 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, pixfmt, pixtype, img.pixels);
nuclear@0 92
nuclear@0 93 tmat.scaling((float)width / (float)tex_width, (float)height / (float)tex_height, 1);
nuclear@0 94 return true;
nuclear@0 95 }
nuclear@0 96
nuclear@0 97 const Mat4 &Texture::texture_matrix() const
nuclear@0 98 {
nuclear@0 99 return tmat;
nuclear@0 100 }
nuclear@0 101
nuclear@0 102 void Texture::bind(bool loadmat) const
nuclear@0 103 {
nuclear@0 104 if(!tex) return;
nuclear@0 105
nuclear@0 106 if(loadmat) {
nuclear@0 107 glMatrixMode(GL_TEXTURE);
nuclear@0 108 glLoadMatrixf(tmat[0]);
nuclear@0 109 glMatrixMode(GL_MODELVIEW);
nuclear@0 110 }
nuclear@0 111
nuclear@0 112 glBindTexture(GL_TEXTURE_2D, tex);
nuclear@0 113 }