How can I get all the uniforms and uniformBlocks

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WebGLFundame · 2025-02-26 · via WebGL Fundamentals

Question:

when I write uniformBuffer in shader like this.

uniform Material {
 uniform vec4 u_DiffuseColor;
 uniform vec4 u_TilingOffset;
 uniform vec3 u_MaterialSpecular;
 uniform float u_AlphaTestValue;
 uniform float u_Shininess;
};

gl.getProgramParameter(program, gl.ACTIVE_UNIFORMS) and gl.getActiveUniform(program, i) still contaion uniformBuffer item( for example u_DiffuseColor,it's redundant!), the only one thing I found is gl.getUniformLocation(program, uniName) will return null.

is there another better way i can get uniforms not include uniformBuffer item,because the i should dispose them with two different way.

https://stackoverflow.com/questions/4783912/how-can-i-find-a-list-of-all-the-uniforms-in-opengl-es-2-0-vertex-shader-pro/4970703 Maybe this is not best way when have uniformBuffer block in shader with opengles3.0

Answer:

You can get all uniforms and which blocks they are in by calling gl.getActiveUniform and gl.getActiveUniforms. gl.getProgramParameter(program, gl.ACTIVE_UNIFORMS) returns the number of uniforms. You then create an array of indices to pass to gl.getActiveUniforms and pass it gl.UNIFORM_BLOCK_INDEX. -1 = not in a block.

Other questions related to using uniform blocks

https://stackoverflow.com/questions/56760912/what-is-the-correct-sequence-for-uploading-a-uniform-block

https://stackoverflow.com/questions/38841124/updating-uniform-buffer-data-in-webgl-2

https://stackoverflow.com/questions/44629165/bind-multiple-uniform-buffer-objects/

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