🔒 Locked

GLSL shader program wrapper and uniforms

Started by KaiserJohan Nov 9, 2012 at 2:22 PM 2 replies 2.4k views

Original Post

Nov 9, 2012 at 2:22 PM

Hello,
Quick question. I've made a shader program wrapper that does what you'd expect, but I'm not sure how to tackle all the different opengl functions for 'glSetUniform*'. For example to add to the api every single call feels messy and cluttered, is there a better way I am missing?

For all the different uniform functions: http://www.opengl.org/sdk/docs/man3/ -> glUniform

Thanks

Erik Rufelt

Nov 9, 2012 at 4:16 PM

Look into uniform buffers.

KaiserJohan

Nov 10, 2012 at 11:59 AM

I've read about it, but I'm not sure how that would help me?

Erik Rufelt

Nov 10, 2012 at 2:14 PM

With buffers you only need one call, as many uniforms can be stored in the same buffer, with different types.

Something like this for example, in your source:


 struct Uniforms {
 float transformMatrix[16];
 float color[4];
 };
 
 Uniforms uniforms;
 uniforms.transformMatrix ...
 uniforms.color ...
 
 glBufferData(GL_UNIFORM_BUFFER, ..., &uniforms, ..);

And in GLSL:


 layout(std140) uniform Uniforms {
 mat4 transformMatrix;
 vec4 color;
 };
 
 in vec3 inPosition;
 out vec4 outColor;
 
 void main() {
 gl_position = transformMatrix * vec4(inPosition, 1.0);
 outColor = color;
 }

Topic Locked

This topic has been locked by a moderator. New replies are not allowed.