xglcomp

annotate src/texture.cc @ 15:6726f29ebbb8

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update backing texture on damage
author John Tsiombikas <nuclear@member.fsf.org>
date Mon, 08 Feb 2016 19:42:54 +0200
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nuclear@4 1 #include <GL/gl.h>
nuclear@4 2 #include <X11/Xlib.h>
nuclear@4 3 #include "texture.h"
nuclear@4 4 #include "logger.h"
nuclear@4 5
nuclear@4 6 Texture::Texture()
nuclear@4 7 {
nuclear@4 8 glGenTextures(1, &tex);
nuclear@4 9 glBindTexture(GL_TEXTURE_2D, tex);
nuclear@4 10 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
nuclear@4 11 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
nuclear@4 12
nuclear@4 13 width = height = 0;
nuclear@4 14 }
nuclear@4 15
nuclear@4 16 Texture::~Texture()
nuclear@4 17 {
nuclear@4 18 if(tex) {
nuclear@4 19 glDeleteTextures(1, &tex);
nuclear@4 20 }
nuclear@4 21 }
nuclear@4 22
nuclear@4 23 void Texture::set_image(int x, int y, unsigned char *pix)
nuclear@4 24 {
nuclear@4 25 glBindTexture(GL_TEXTURE_2D, tex);
nuclear@4 26
nuclear@4 27 if(x == width && y == height) {
nuclear@4 28 if(pix) {
nuclear@4 29 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, x, y, GL_BGRA, GL_UNSIGNED_BYTE, pix);
nuclear@4 30 }
nuclear@4 31
nuclear@4 32 } else {
nuclear@4 33 width = x;
nuclear@4 34 height = y;
nuclear@4 35 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, x, y, 0, GL_BGRA, GL_UNSIGNED_BYTE,
nuclear@4 36 pix ? pix : 0);
nuclear@4 37 }
nuclear@4 38 }
nuclear@4 39
nuclear@4 40 void Texture::set_image(Display *dpy, Pixmap pixmap)
nuclear@4 41 {
nuclear@4 42 Window root_ret;
nuclear@4 43 int x, y;
nuclear@4 44 unsigned int w, h, border, depth;
nuclear@4 45 XGetGeometry(dpy, pixmap, &root_ret, &x, &y, &w, &h, &border, &depth);
nuclear@4 46
nuclear@4 47 XImage *ximg = XGetImage(dpy, pixmap, 0, 0, w, h, 0xffffffff, ZPixmap);
nuclear@4 48 if(!ximg) {
nuclear@4 49 log_error("XGetImage failed to create an image from the window pixmap\n");
nuclear@4 50 return;
nuclear@4 51 }
nuclear@4 52
nuclear@4 53 glBindTexture(GL_TEXTURE_2D, tex);
nuclear@4 54
nuclear@4 55 if((int)w == width && (int)h == height) {
nuclear@4 56 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, w, h, GL_BGRA, GL_UNSIGNED_BYTE, ximg->data);
nuclear@4 57 } else {
nuclear@4 58 width = w;
nuclear@4 59 height = h;
nuclear@4 60 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_BGRA, GL_UNSIGNED_BYTE, ximg->data);
nuclear@4 61 }
nuclear@4 62 }
nuclear@4 63
nuclear@4 64 int Texture::get_width() const
nuclear@4 65 {
nuclear@4 66 return width;
nuclear@4 67 }
nuclear@4 68
nuclear@4 69 int Texture::get_height() const
nuclear@4 70 {
nuclear@4 71 return height;
nuclear@4 72 }
nuclear@4 73
nuclear@4 74 unsigned int Texture::get_id() const
nuclear@4 75 {
nuclear@4 76 return tex;
nuclear@4 77 }