CODEWITHSUNDEEP
c++openglglfwglm-math
SimeonT
SimeonT

Reputation: 46

DEBUG_TYPE_ERROR when passing glm::vec2 type using glUniformMatrix2fv

I am trying to pass the frame size (X, Y) to my fragment shader. When I execute the GLAD function glUniformMatrix2fv, I get the following error:

GL CALLBACK: ** GL ERROR ** type = "0x824c", severity = "0x9146", message = Error has been generated. GL error GL_INVALID_OPERATION

I use this method to pass glm::vec4 datatypes (using glUniformMatrix4fv) for many other shaders without issue. I've looked up the error type, 0x824c, and it appears to be a DEBUG_TYPE_ERROR. I have checked the function call in the relevant documention, and it appears to be correct. What am I missing?

Drawing code:

uFrameSizeID = glGetUniformLocation(shader->id(), "uFrameSize");
glUniformMatrix2fv(uFrameSizeID, 1, GL_FALSE, glm::value_ptr(
    glm::vec2(static_cast<float>(X_RESOLUTION), static_cast<float>(Y_RESOLUTION))));

Fragment Shader:

layout(location = 0) out vec4 FragColor;

in VertexData
{
    vec4 color;
    vec2 texCoords;
} fs_in;

uniform sampler2D uTexture;
uniform sampler2D uDistortionMapX;
uniform sampler2D uDistortionMapY;
uniform vec4 uWindow;       // = [x0, y0, dx, dy]
uniform vec2 uFrameSize;    // = [X, Y] float

void main()
{
    vec2 v2_dist_vec;
    v2_dist_vec.x = texture(uDistortionMapX, fs_in.texCoords).r;
    v2_dist_vec.y = texture(uDistortionMapY, fs_in.texCoords).r;
    FragColor = texture(uTexture, fs_in.texCoords + v2_corr_vec);       
}

Upvotes: 1

Views: 304

Answers (1)

Ripi2
Ripi2

Reputation: 7198

glUniformMatrix2fv passes a 2x2 matrix. But in your shader you use uniform vec2 uFrameSize; which is a pair of floats. You must use glUniform2fv, or even simpler glUniform2f:

uFrameSizeID = glGetUniformLocation(shader->id(), "uFrameSize");
glUniform2f(uFrameSizeID, static_cast<float>(X_RESOLUTION), static_cast<float>(Y_RESOLUTION));

Upvotes: 1

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