cannot pass uniform float array to fragment shader

Question

I'm trying to pass an array to a fragment shader:

//c++ code
float filter[9] = {-1.0f,-1.0f,-1.0f, -1.0f,9.0f,-1.0f, -1.0f,-1.0f,-1.0f};           
glUniform1fv(glGetUniformLocation(imageShaderId, "filter"), 9, filter);


//inside fragment shader code
uniform float filter[9]; //global
if(filter[0]==-1.0) gl_FragColor = red;//in main()

This doesnt work for me.. I've looked at many examples and all seem to point to my code being correct? i can pass a single variable float without issues using glUniform1f, but not the array. Can somebody point me in the right direction?

possible duplicate of GLSL: passing a list of values to fragment shader — Nicol Bolas
– Nicol Bolas, Commented Mar 2, 2013 at 22:46

saiy2k · Accepted Answer · 2013-05-31 15:51:43Z

3

Here is how I passed a float array to fragment shader:

C++

GLfloat params[3];
params[0] = 2.0f;
params[1] = 1.0f;
params[2] = 1.0f;

colorRampUniformLocation = glGetUniformLocation(glprog->getProgram(), "params");
glUniform1fv(colorRampUniformLocation, 3, params);

In Shader:

uniform float params[3];

answered May 31, 2013 at 15:51

saiy2k

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