conworlds

annotate src/texture.cc @ 6:3c36bc28c6c2

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more stuff in the vr test
author John Tsiombikas <nuclear@member.fsf.org>
date Thu, 21 Aug 2014 01:08:03 +0300
parents 879194e4b1f0
children bd8202d6d28d
rev   line source
nuclear@2 1 #include "texture.h"
nuclear@2 2 #include "opengl.h"
nuclear@2 3
nuclear@2 4 Texture::Texture()
nuclear@2 5 {
nuclear@2 6 tex = 0;
nuclear@2 7 type = GL_TEXTURE_2D;
nuclear@2 8 }
nuclear@2 9
nuclear@2 10 Texture::~Texture()
nuclear@2 11 {
nuclear@2 12 destroy();
nuclear@2 13 }
nuclear@2 14
nuclear@2 15 void Texture::create2d(int xsz, int ysz)
nuclear@2 16 {
nuclear@2 17 destroy();
nuclear@2 18
nuclear@2 19 type = GL_TEXTURE_2D;
nuclear@2 20 img.create(xsz, ysz);
nuclear@2 21
nuclear@2 22 if(!tex) {
nuclear@2 23 glGenTextures(1, &tex);
nuclear@2 24 }
nuclear@2 25 glBindTexture(type, tex);
nuclear@2 26 glTexParameteri(type, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@2 27 glTexParameteri(type, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@2 28 glTexImage2D(type, 0, GL_RGBA, xsz, ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
nuclear@2 29 }
nuclear@2 30
nuclear@2 31 void Texture::destroy()
nuclear@2 32 {
nuclear@2 33 if(tex) {
nuclear@2 34 glDeleteTextures(1, &tex);
nuclear@2 35 }
nuclear@2 36 }
nuclear@2 37
nuclear@2 38 void Texture::set_image(const Image &img)
nuclear@2 39 {
nuclear@2 40 this->img = img;
nuclear@2 41 create2d(img.get_width(), img.get_height());
nuclear@2 42
nuclear@2 43 glTexSubImage2D(type, 0, 0, 0, img.get_width(), img.get_height(),
nuclear@2 44 GL_RGBA, GL_UNSIGNED_BYTE, img.get_pixels());
nuclear@2 45 }
nuclear@2 46
nuclear@2 47 Image &Texture::get_image()
nuclear@2 48 {
nuclear@2 49 return img;
nuclear@2 50 }
nuclear@2 51
nuclear@2 52 const Image &Texture::get_image() const
nuclear@2 53 {
nuclear@2 54 return img;
nuclear@2 55 }
nuclear@2 56
nuclear@2 57 unsigned int Texture::get_texture_id() const
nuclear@2 58 {
nuclear@2 59 return tex;
nuclear@2 60 }
nuclear@2 61
nuclear@2 62 void Texture::bind(int tunit) const
nuclear@2 63 {
nuclear@2 64 glActiveTextureARB(GL_TEXTURE0_ARB + tunit);
nuclear@2 65 glBindTexture(type, tex);
nuclear@2 66 glActiveTextureARB(GL_TEXTURE0_ARB);
nuclear@2 67 }
nuclear@2 68
nuclear@2 69 bool Texture::load(const char *fname)
nuclear@2 70 {
nuclear@2 71 Image image;
nuclear@2 72 if(!image.load(fname)) {
nuclear@2 73 return false;
nuclear@2 74 }
nuclear@2 75 set_image(image);
nuclear@2 76 return true;
nuclear@2 77 }
nuclear@6 78
nuclear@6 79 unsigned int next_pow2(unsigned int x)
nuclear@6 80 {
nuclear@6 81 x -= 1;
nuclear@6 82 x |= x >> 1;
nuclear@6 83 x |= x >> 2;
nuclear@6 84 x |= x >> 4;
nuclear@6 85 x |= x >> 8;
nuclear@6 86 x |= x >> 16;
nuclear@6 87 return x + 1;
nuclear@6 88 }