I am working on GLES program using ARM GLES3.0 Emulator ver 1.4.
I want to print all active uniform detail.
I ahve 25 active Uniform in my shader code, out of these 25 uniforms, second uniform is array of uniform 'uniformArray[100]'.
But when I iterate through active uniforms to see detail of each uniform, itstarts giving garbage values after first 25 uniforms( i.e after activeUniform1, uniformArray[0], uniformArray[1], uniformArray[2],... uniformArray[23] )
Please confirm if it was an issue with EGL 1.4
Hi Sunil,
how do you get the location of uniformArray[25]?
Thanks,
Lorenzo
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
can you provide the shader where the uniform array is declared?
Chris
What version of emulator you get reported by calling glGetString(GL_RENDERER); ?
additionally to the important questions that Chris and Adam have asked you, and would help us very much understanding the issue with your code, I suggest you to check this question on StackOverflow: How can I find a list of all the uniforms in OpenGL es 2.0 vertex shader pro - Stack Overflow
I know it's a simple example, but still a good way of checking the basics.
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 ...