Issue with array of uniforms in Shader Code

Hello SUNIL!,

From the information you've submitted, I cannot confirm a problem with querying active uniforms in Emulator 1.4.0 and 1.4.1 releases.

Can you give us more information about how you iterate over it?

Relevant portions of your shaders and application code maybe?

Please also let us know which exactly version of the Emulator you are using. When unsure, use glGetString(GL_RENDERER) to get the version info.

In addition, please include and run he following code right after you've linked you program:

    GLint numUniforms = 0;
    GL_CHECK(glGetProgramiv(uiProgram, GL_ACTIVE_UNIFORMS, &numUniforms));
    printf("--------------------\nList of active uniforms:\n");
    for (int i = 0; i < numUniforms; i++)
    {
        // now -iteratuing through uniforms
        GLchar name[256] = { 0 };
        GLsizei len = 0;
        GLint size = 0;
        GLenum type = 0;
        GL_CHECK(glGetActiveUniform(uiProgram, i, 256, &len, &size, &type, name));
        printf("Uniform: %s, size: %d\n", name, size);
    }

And let us know console output printed,

This will help us to get closer to you particular problem.

Thanks

Adam

Hello SUNIL!,

From the information you've submitted, I cannot confirm a problem with querying active uniforms in Emulator 1.4.0 and 1.4.1 releases.

Can you give us more information about how you iterate over it?

Relevant portions of your shaders and application code maybe?

Please also let us know which exactly version of the Emulator you are using. When unsure, use glGetString(GL_RENDERER) to get the version info.

In addition, please include and run he following code right after you've linked you program:

    GLint numUniforms = 0;
    GL_CHECK(glGetProgramiv(uiProgram, GL_ACTIVE_UNIFORMS, &numUniforms));
    printf("--------------------\nList of active uniforms:\n");
    for (int i = 0; i < numUniforms; i++)
    {
        // now -iteratuing through uniforms
        GLchar name[256] = { 0 };
        GLsizei len = 0;
        GLint size = 0;
        GLenum type = 0;
        GL_CHECK(glGetActiveUniform(uiProgram, i, 256, &len, &size, &type, name));
        printf("Uniform: %s, size: %d\n", name, size);
    }

And let us know console output printed,

This will help us to get closer to you particular problem.

Thanks

Adam

Hi Sunil,

can you provide the shader where the uniform array is declared?

Thanks,

Chris

What version of emulator you get reported by calling glGetString(GL_RENDERER); ?

pseudo code -

GLint numUniforms = 0;
GL_CHECK(glGetProgramiv(uiProgram, GL_ACTIVE_UNIFORMS, &numUniforms));


printf("--------------------\nList of active uniforms:\n"); // numUniforms is 25 for my problem
for (int i = 0; i < numUniforms; i++) {
    // now -iteratuing through uniforms
    GLchar name[256] = { 0 };
    GLsizei len = 0;
    GLint size = 0;
    GLenum type = 0;
    GL_CHECK(glGetActiveUniform(uiProgram, i, 256, &len, &size, &type, name));
    printf("Uniform: %s, size: %d\n", name, size);
    std::string modifiedName = getUniformName(name, size); // replaces uniformArray[0] by uniformArray


    for (i = 0; i < size; ++i) {
        std::stringstream ss;
        ss << modifiedName;
        if (size > 1) {
           ss << '[' << i << ']';
        }


    std::string elemName = ss.str();
    float uniformValue = 0.0f;
    GLint location = glGetUniformLocation(program, elemName.c_str());
    assert(location != -1);
    if (location == -1) {
        continue;
    }
    
    switch (elemType) {
        case GL_FLOAT:
        glGetUniformfv(uiProgram, location, uniformValue);
        std::cout << elemName << ":"  << uniformValue << std::endl;
.....
....

    }




}
}




Output:
fltUniform1:1.7
uniformArray[0]:1.5
uniformArray[1]:1.6
uniformArray[2]:1.3
uniformArray[3]:1.8
..
..
uniformArray[22]:4.8
uniformArray[23]:4.3
uniformArray[24]:4.3
uniformArray[25]:4.3
uniformArray[26]:4.3
uniformArray[27]:4.3
...
//repeats total printed uniforms become 25
...
uniformArray[98]:4.3
uniformArray[99]:4.3
fltUniform2:-1.073742e+008
intUniform3:-858993460
intUniform4:-858993460
...