Major slowdown of rendering textures

g7tommyB · 2002-11-25T17:04:11

Hi, I have the following problem that I am batteling with. I have a function that renders a quad and texture maps it with a "space" texture. I then render another quad on top of the first one and texture map it with a "nebula" texture. When my space ship flie over (i.e. is rendered on top of these two quads) the nebula, I notice a significant slow-down in the game and the FPS starts to drop rather quickly... What could be causing this major slow-down. Below is the snippet of the function that is responsible for rendering the space and nebula quads: glBindTexture(GL_TEXTURE_2D, Object->Textures[0]); if(strcmp(Object->type, "SPACE") == 0) { glBegin(GL_TRIANGLE_STRIP); glTexCoord2f(0, 0); glVertex3f(Object->startx, Object->starty, -5.0f); glTexCoord2f(0, 2); glVertex3f(Object->startx, Object->endy, -5.0f); glTexCoord2f(2, 0); glVertex3f(Object->endx, Object->starty, -5.0f); glTexCoord2f(2, 2); glVertex3f(Object->endx, Object->endy, -5.0f); glEnd(); } else { glBegin(GL_TRIANGLE_STRIP); glTexCoord2f(0, 0); glVertex3f(Object->startx, Object->starty, -4.99f); glTexCoord2f(0, 1); glVertex3f(Object->startx, Object->endy, -4.99f); glTexCoord2f(1, 0); glVertex3f(Object->endx, Object->starty, -4.99f); glTexCoord2f(1, 1); glVertex3f(Object->endx, Object->endy, -4.99f); glEnd(); } Any suggestions or comments would be greatly appreciated. Cheers! TommyB

Graphics and GPU Programming Programming

Started by g7tommyB November 21, 2002 07:12 PM

10 comments, last by g7tommyB 21 years, 4 months ago

Xero-X2

184

November 25, 2002 04:16 PM

Under what conditions is the spaceship rendered?

"I seek knowledge and to help those who also seek it"

g7tommyB

122

Author

November 25, 2002 05:04 PM

The spaceship is an .ms3d object with a texture applied.
It is rendered with glEnabled(GL_TEXTURE_2D)
plus glEnabled(GL_LIGHTING). Blending is disabled for spaceship rendering. It is, however, enabled for redering of space + nebula.

Cheers,

TommyB

g7tommyB

Major slowdown of rendering textures

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