http://bugs.freedesktop.org/show_bug.cgi?id=13258
--- Comment #7 from Chris Rankin <[EMAIL PROTECTED]> 2008-09-04 05:46:00 PST
---
I have been examining the rubik code. Each individul sub-cube is drawn by a
function called draw_cubit(), which has the following structure:
draw_cubit()
draw_stickerless_cubit()
if (back face visible)
draw back sticker;
if (front face visible)
draw front sticker;
if (left face visible)
draw left sticker;
if (right face visible)
draw right sticker;
if (bottom face visible)
draw bottom sticker;
if (top face visible)
draw top sticker;
I have discovered that commenting out the call to draw_stickerless_cubit() here
allows the colored stickers to be seen again. It also makes the program run a
LOT faster, i.e. there is no longer a huge decrease in performance for larger
rubik's cubes. The draw_stickerless_cubit() function look like this:
#define CUBELEN 0.50
#define CUBEROUND (CUBELEN-0.05)
#define STICKERLONG (CUBEROUND-0.05)
#define STICKERSHORT (STICKERLONG-0.05)
#define STICKERDEPTH (CUBELEN+0.01)
draw_stickerless_cubit:
glBegin(GL_QUADS);
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGray);
/* Put sticker here */
glNormal3f(0.00, 0.00, 1.00);
glVertex3f(-CUBEROUND, -CUBEROUND, CUBELEN);
glVertex3f(CUBEROUND, -CUBEROUND, CUBELEN);
glVertex3f(CUBEROUND, CUBEROUND, CUBELEN);
glVertex3f(-CUBEROUND, CUBEROUND, CUBELEN);
// And other 5 faces...
/* Edges of cubit */
glNormal3f(-1.00, -1.00, 0.00);
glVertex3f(-CUBEROUND, -CUBELEN, -CUBEROUND);
glVertex3f(-CUBEROUND, -CUBELEN, CUBEROUND);
glVertex3f(-CUBELEN, -CUBEROUND, CUBEROUND);
glVertex3f(-CUBELEN, -CUBEROUND, -CUBEROUND);
// And other 5 faces...
glEnd();
glBegin(GL_TRIANGLES);
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGray);
/* Corners of cubit */
glNormal3f(1.00, 1.00, 1.00);
glVertex3f(CUBEROUND, CUBEROUND, CUBELEN);
glVertex3f(CUBELEN, CUBEROUND, CUBEROUND);
glVertex3f(CUBEROUND, CUBELEN, CUBEROUND);
// And other 5 faces...
glEnd();
It seems to be the GL_QUADS part of draw_stickerless_cubit() that makes
everything very slow, with the stickerless cube somehow masking the colors.
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