djg

if (texture() && texture()->SomeMethod()) {
    texture()->SomeOtherMethod()->FooBar();
}

vs

Texture* tex = texture();
if (tex && tex->SomeMethod()) {
    tex->SomeOtherMethod()->FooBar();
}

djg

Truly superior pilots are those who use their superior judgment to avoid those situations where they might have to use their superior skills.

— cliché

djg

// -----------------------------------------------------------------------------
// PUBLIC
public:

djg

#version 150
out vec4 gl_FragColor
#ifdef GL_ES
precision mediump float;
#define COLOR_PRECISION lowp
#else
#define COLOR_PRECISION
#endif
uniform COLOR_PRECISION vec4 uRenderColor;
uniform sampler2D uTexture;

djg

The GL_TRANSFORM_FEEDBACK_BUFFER buffer binding point may be
passed to glBindBuffer, but will not directly affect transform
feedback state. Instead, the indexed GL_TRANSFORM_FEEDBACK_BUFFER
bindings must be used through a call to glBindBufferBase or
glBindBufferRange. This will affect the generic
GL_TRANSFORM_FEEDBACK_BUFFER binding.

Likewise, the GL_UNIFORM_BUFFER buffer binding point may be used,
but does not directly affect uniform buffer
state. glBindBufferBase or glBindBufferRange must be used to bind

djg

;; I'm always opening a buffer in the wrong window. These function
;; help move the newly opened buffer to another window and restore the
;; buffer I was previously looking at.
(defun djg/buf-move (dir errmsg)
  (let* ((other-win (windmove-find-other-window dir))
         (buf-this-buf (window-buffer (selected-window))))
    (if (null other-win)
        (error errmsg)
      (set-window-buffer other-win buf-this-buf)
      (switch-to-prev-buffer))))

djg

$ ninja && ./xfb
[2/2] clang++ xfb.o deRandom.o gl3w.o -o xfb -lglfw3 -framework Cocoa -framework OpenGL -framework IOKit -framework CoreVideo
glDrawArrays(0x0000, 0, 64)
pauseTransformFeedback
glDrawArrays(0x0000, 64, 64)
resumeTransformFeedback
glDrawArrays(0x0000, 128, 64)
GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN = 64

djg

GLuint buf;
glGenBuffers(1, &buf);
// glBindBuffer(GL_UNIFORM, buf); <-- OSX needs this or ...
glBindBufferRange(GL_UNIFORM_BUFFER, 0, buf, 0, 4); // ... this returns GL_INVALID_VALUE

djg

int* bsearch(int val, int* base, int nelems)
{
    if (base == NULL || nelems == 0)
        return NULL;

    int lo = 0;
    int hi = nelems - 1;

    for (;;)
    {

djg

int binarysearch(DataType t)
    /* return (any) position
       if t in sorted x[0..n-1] or
       -1 if t is not present */
{
    int l, u, m;
    l = 0;
    u = n-1;
    while (l <= u) {
        m = (l + u) / 2;