added the capability to crudely resize images by half in image.cc

[laserbrain_demo] / src / texture.cc

diff --git a/src/texture.cc b/src/texture.cc
index dae0c7c..ff4d1b5 100644 (file)
--- a/src/texture.cc
+++ b/src/texture.cc
@@ -245,6 +245,8 @@ void Texture::set_image_2d(const Image &img)
        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);
@@ -263,6 +265,7 @@ void Texture::set_image_2d(const Image &img)
 
 bool Texture::set_image_cube(const Image &img, int idx)
 {
+       unsigned int err;
        if(idx < 0 || idx >= 6) {
                return false;
        }
@@ -276,7 +279,10 @@ bool Texture::set_image_cube(const Image &img, int idx)
 
        target = GL_TEXTURE_CUBE_MAP;
        glBindTexture(target, id);
-       assert(glGetError() == GL_NO_ERROR);
+       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);
@@ -301,15 +307,15 @@ bool Texture::set_image_cube(const Image &img)
        int xsz = img.get_width();
        int ysz = img.get_height();
 
-       if(xsz / 4 == ysz / 3) {
+       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 / 3 == ysz / 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 / 3 == ysz / 2) {
+       if((xsz << 8) / 3 == (ysz << 8) / 2) {
                // horizontal sixpack
                return set_cube_multi(img, hsix[0], hsix[1], ysz / 2);
        }