Jump to content
  • Advertisement
Sign in to follow this  

OpenGL Fragment shaders and GLSL

This topic is 4783 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

Hello - I've been playing around with vertex and fragment shaders for the last week or so. Using the OpenGL shading language I've been able to install and use vertex shaders just fine. My problem arises when I start using fragment shaders in conjunction with the vertex shaders. If the fragment shader is simple (such as just assigning the gl_FragColor the texture color) everything works just fine. However, if I introduce a varying varible everything starts to break down. The shader outputs inconsistent colors mapped onto my polygon and I'm beginning to think it's a driver problem... here's why: 1) I set a varying variable in the vertex shader to always be 0. In the fragment shader I multiply the texture color by that varying variable and expect the color output to be black. Unfortunately, the color is output with no effect at all. 2) I've downloaded some GLSL examples that use fragment shaders (from humus 3d and ATI example code). The demos load and run but definitely do not look at all like they're suppose to. So I'm running all this code on my only 'shader capable' machine, which is an AMD turion laptop (512MB ram / 128Mb shared with the video card / Windows Server 2003) with a Radeon Xpress 200M graphics card. I've tried updating my drivers to the latest catalyst and have had no success. Has anyone seen this problem? Or better yet, does anyone know a solution? Thanks for your help --Andrew

Share this post

Link to post
Share on other sites
Sign in to follow this  

  • Advertisement

Important Information

By using GameDev.net, you agree to our community Guidelines, Terms of Use, and Privacy Policy.

GameDev.net is your game development community. Create an account for your GameDev Portfolio and participate in the largest developer community in the games industry.

Sign me up!