Not getting uniform from Shader fragment with glGetUniformLocation [on hold]

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0
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My fragment shader looks like this:

#version 450
out vec4 frag_colour;
uniform vec4 u_Color;
void main () 
 frag_colour = u_Color;

colorGlobal is a float changing its value upon buttonclick, initialized to float 0.0. when I run this code:

int locationColour = glGetUniformLocation(shader_program, "u_Color");

glUniform4f(locationColour, 0.9f, 0.3f, colorGlobal, 1.0f);

in my while (!glfwWindowShouldClose (window))

im getting -1 printed out for the locationColour. What could I have missed here?

when hardcoding the fragment shader like this:

#version 450
out vec4 frag_colour;
void main () 
 frag_colour = vec4 (0.3, 0.3, 0.5, 1.0);

Then im getting a purple triangle. Any suggestions on why the uniform is not working properly?

edited yesterday

Rabbid76

29.3k112742

asked yesterday

orgee

112

put on hold as off-topic by Nicol Bolas, derhass, Rabbid76, EdChum, Shiladitya yesterday

This question appears to be off-topic. The users who voted to close gave this specific reason:

"Questions seeking debugging help ("why isn't this code working?") must include the desired behavior, a specific problem or error and the shortest code necessary to reproduce it in the question itself. Questions without a clear problem statement are not useful to other readers. See: How to create a Minimal, Complete, and Verifiable example." – Nicol Bolas, derhass, Rabbid76, EdChum, Shiladitya

If this question can be reworded to fit the rules in the help center, please edit the question.

1

Did you glUseProgram before glUniform4f?
– Rabbid76
yesterday

Yeah, right before the while loop.
– orgee
yesterday

Are you also calling glUniform4f before the while loop? Note that the currently attached program must be shader_program for you to be able to set the uniform for it.
– wdc
yesterday

1

Do you glLinkProgram before glGetUniformLocation?
– Rabbid76
yesterday

Thanks alot for your time guys. I did a horrible misstake, declared my shader_program as a global int and also a local int in the function where i link, attach the files. So I was using the global one which is only an int for the glGetUniformLocation.
– orgee
yesterday

add a comment |

up vote
0
down vote

favorite

My fragment shader looks like this:

#version 450
out vec4 frag_colour;
uniform vec4 u_Color;
void main () 
 frag_colour = u_Color;

colorGlobal is a float changing its value upon buttonclick, initialized to float 0.0. when I run this code:

int locationColour = glGetUniformLocation(shader_program, "u_Color");

glUniform4f(locationColour, 0.9f, 0.3f, colorGlobal, 1.0f);

in my while (!glfwWindowShouldClose (window))

im getting -1 printed out for the locationColour. What could I have missed here?

when hardcoding the fragment shader like this:

#version 450
out vec4 frag_colour;
void main () 
 frag_colour = vec4 (0.3, 0.3, 0.5, 1.0);

Then im getting a purple triangle. Any suggestions on why the uniform is not working properly?

edited yesterday

Rabbid76

29.3k112742

asked yesterday

orgee

112

put on hold as off-topic by Nicol Bolas, derhass, Rabbid76, EdChum, Shiladitya yesterday

This question appears to be off-topic. The users who voted to close gave this specific reason:

"Questions seeking debugging help ("why isn't this code working?") must include the desired behavior, a specific problem or error and the shortest code necessary to reproduce it in the question itself. Questions without a clear problem statement are not useful to other readers. See: How to create a Minimal, Complete, and Verifiable example." – Nicol Bolas, derhass, Rabbid76, EdChum, Shiladitya

If this question can be reworded to fit the rules in the help center, please edit the question.

1

Did you glUseProgram before glUniform4f?
– Rabbid76
yesterday

Yeah, right before the while loop.
– orgee
yesterday

Are you also calling glUniform4f before the while loop? Note that the currently attached program must be shader_program for you to be able to set the uniform for it.
– wdc
yesterday

1

Do you glLinkProgram before glGetUniformLocation?
– Rabbid76
yesterday

Thanks alot for your time guys. I did a horrible misstake, declared my shader_program as a global int and also a local int in the function where i link, attach the files. So I was using the global one which is only an int for the glGetUniformLocation.
– orgee
yesterday

add a comment |

up vote
0
down vote

favorite

My fragment shader looks like this:

#version 450
out vec4 frag_colour;
uniform vec4 u_Color;
void main () 
 frag_colour = u_Color;

colorGlobal is a float changing its value upon buttonclick, initialized to float 0.0. when I run this code:

int locationColour = glGetUniformLocation(shader_program, "u_Color");

glUniform4f(locationColour, 0.9f, 0.3f, colorGlobal, 1.0f);

in my while (!glfwWindowShouldClose (window))

im getting -1 printed out for the locationColour. What could I have missed here?

when hardcoding the fragment shader like this:

#version 450
out vec4 frag_colour;
void main () 
 frag_colour = vec4 (0.3, 0.3, 0.5, 1.0);

Then im getting a purple triangle. Any suggestions on why the uniform is not working properly?

edited yesterday

Rabbid76

29.3k112742

asked yesterday

orgee

112

My fragment shader looks like this:

#version 450
out vec4 frag_colour;
uniform vec4 u_Color;
void main () 
 frag_colour = u_Color;

colorGlobal is a float changing its value upon buttonclick, initialized to float 0.0. when I run this code:

int locationColour = glGetUniformLocation(shader_program, "u_Color");

glUniform4f(locationColour, 0.9f, 0.3f, colorGlobal, 1.0f);

in my while (!glfwWindowShouldClose (window))

im getting -1 printed out for the locationColour. What could I have missed here?

when hardcoding the fragment shader like this:

#version 450
out vec4 frag_colour;
void main () 
 frag_colour = vec4 (0.3, 0.3, 0.5, 1.0);

Then im getting a purple triangle. Any suggestions on why the uniform is not working properly?

opengl

edited yesterday

Rabbid76

29.3k112742

asked yesterday

orgee

112

edited yesterday

Rabbid76

29.3k112742

asked yesterday

orgee

112

edited yesterday

Rabbid76

29.3k112742

edited yesterday

Rabbid76

29.3k112742

edited yesterday

Rabbid76

29.3k112742

asked yesterday

orgee

112

asked yesterday

orgee

112

asked yesterday

orgee

112

put on hold as off-topic by Nicol Bolas, derhass, Rabbid76, EdChum, Shiladitya yesterday

This question appears to be off-topic. The users who voted to close gave this specific reason:

"Questions seeking debugging help ("why isn't this code working?") must include the desired behavior, a specific problem or error and the shortest code necessary to reproduce it in the question itself. Questions without a clear problem statement are not useful to other readers. See: How to create a Minimal, Complete, and Verifiable example." – Nicol Bolas, derhass, Rabbid76, EdChum, Shiladitya

If this question can be reworded to fit the rules in the help center, please edit the question.

put on hold as off-topic by Nicol Bolas, derhass, Rabbid76, EdChum, Shiladitya yesterday

This question appears to be off-topic. The users who voted to close gave this specific reason:

"Questions seeking debugging help ("why isn't this code working?") must include the desired behavior, a specific problem or error and the shortest code necessary to reproduce it in the question itself. Questions without a clear problem statement are not useful to other readers. See: How to create a Minimal, Complete, and Verifiable example." – Nicol Bolas, derhass, Rabbid76, EdChum, Shiladitya

If this question can be reworded to fit the rules in the help center, please edit the question.

1

Did you glUseProgram before glUniform4f?
– Rabbid76
yesterday

Yeah, right before the while loop.
– orgee
yesterday

Are you also calling glUniform4f before the while loop? Note that the currently attached program must be shader_program for you to be able to set the uniform for it.
– wdc
yesterday

1

Do you glLinkProgram before glGetUniformLocation?
– Rabbid76
yesterday

Thanks alot for your time guys. I did a horrible misstake, declared my shader_program as a global int and also a local int in the function where i link, attach the files. So I was using the global one which is only an int for the glGetUniformLocation.
– orgee
yesterday

add a comment |

1

Did you glUseProgram before glUniform4f?
– Rabbid76
yesterday

Yeah, right before the while loop.
– orgee
yesterday

Are you also calling glUniform4f before the while loop? Note that the currently attached program must be shader_program for you to be able to set the uniform for it.
– wdc
yesterday

1

Do you glLinkProgram before glGetUniformLocation?
– Rabbid76
yesterday

Thanks alot for your time guys. I did a horrible misstake, declared my shader_program as a global int and also a local int in the function where i link, attach the files. So I was using the global one which is only an int for the glGetUniformLocation.
– orgee
yesterday

Did you glUseProgram before glUniform4f?
– Rabbid76
yesterday

Yeah, right before the while loop.
– orgee
yesterday

Are you also calling glUniform4f before the while loop? Note that the currently attached program must be shader_program for you to be able to set the uniform for it.
– wdc
yesterday

Do you glLinkProgram before glGetUniformLocation?
– Rabbid76
yesterday

Thanks alot for your time guys. I did a horrible misstake, declared my shader_program as a global int and also a local int in the function where i link, attach the files. So I was using the global one which is only an int for the glGetUniformLocation.
– orgee
yesterday

add a comment |

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