GLSL Geometry Shader causes "No vertex shader bound at draw" in RenderDoc - c++

Question

I am trying to get a basic geometry shader to work, but I am completely failing. After checking numerous resources, I still cannot find a solution to my problem.
Here is my code for my vertex, geometry, and fragment shaders.
Vertex Shader:
#version 330 core
// Vertex Shader Inputs
layout (location = 0) in vec3 Pos;
layout (location = 1) in vec3 Norm;
layout (location = 2) in vec3 Color;
// Vertex to Fragment Shader Outputs
out DATA {
vec3 vsPos;
vec3 vsNorm;
vec4 vsColor;
} data_out;
// Main.cpp Imports
uniform mat4 camMatrix; // viewProjection Matrix
uniform mat4 model;
void main()
{
vec3 vsPos = vec3(model * vec4(Pos, 1.0f));
vec3 vsNorm = mat3(transpose(inverse(model))) * Norm; // Normal vector correction
vec4 vsColor = vec4(Color, 1.0f);
gl_Position = camMatrix * vec4(vsPos, 1.0f);
}
Geometry Shader:
#version 330 core
layout (triangles) in;
layout (triangle_strip, max_vertices = 3) out;
out vec3 gsPos;
out vec3 gsNorm;
out vec3 gsColor;
in DATA {
vec3 vsPos;
vec3 vsNorm;
vec4 vsColor;
} data_in[];
uniform mat4 camMatrix;
void main()
{
for (int i=0; i<3; i++)
{
gsPos = data_in[i].vsPos;
gsNorm = data_in[i].vsNorm;
gsColor = data_in[i].vsColor;
gl_Position = camMatrix * vec4(data_in[i].vsPos, 1.0f);
EmitVertex();
}
EndPrimitive();
}
Fragment Shader:
#version 330 core
out vec4 FragColor;
// Fragment Shader Inputs
in vec3 gsPos;
in vec3 gsNorm;
in vec4 gsColor;
// Fragment Shader Uniforms
uniform sampler2D diffuse0;
uniform sampler2D specular0;
uniform vec4 lightColor;
uniform vec3 lightPos;
uniform vec3 camPos;
vec4 pointLight()
{
vec3 lightVec = (lightPos - vsPos);
// intensity of light with respect to distance
float dist = length(lightVec);
float a = 0.7;
float b = 0.4;
float c = 1.0;
float inten = 1.0f / (a * dist * dist + b * dist + c);
// ambient lighting
float ambient = 0.75f;
// diffuse lighting
vec3 fsNorm = normalize(gsNorm);
vec3 lightDirection = normalize(lightVec);
float diffuse = max(dot(fsNorm, lightDirection), 0.0f);
// specular lighting
float specular = 0.0f;
if (diffuse != 0.0f)
{
float specularLight = 0.50f;
vec3 viewDirection = normalize(gsNorm - gsPos);
vec3 halfwayVec = normalize(viewDirection + lightDirection);
float specAmount = pow(max(dot(fsNorm, halfwayVec), 0.0f), 32);
specular = specAmount * specularLight;
};
return inten * (gsColor * (diffuse + ambient) + gsColor * specular) * lightColor;
}
void main()
{// outputs final color
FragColor = pointLight();
}
My mesh generation function:
void genMesh()
{
VAO.Bind();
VBO VBO(vtx);
EBO EBO(idx);
VAO.LinkAttrib(VBO, 0, 3, GL_FLOAT, sizeof(Vertex), (void*)0);
VAO.LinkAttrib(VBO, 1, 3, GL_FLOAT, sizeof(Vertex), (void*)(3 * sizeof(float)));
VAO.LinkAttrib(VBO, 2, 4, GL_FLOAT, sizeof(Vertex), (void*)(6 * sizeof(float)));
VAO.Unbind();
VBO.Unbind();
EBO.Unbind();
};
My mesh draw function:
void Mesh::Draw(Shader& shader, Camera& camera)
{
shader.Activate();
VAO.Bind();
// Take care of the camera Matrix
glUniform3f(glGetUniformLocation(shader.ID, "camPos"),
camera.Position.x,
camera.Position.y,
camera.Position.z);
camera.Matrix(shader, "camMatrix");
// Draw the actual mesh
glDrawElements(GL_TRIANGLES, idx.size() * sizeof(GLuint), GL_UNSIGNED_INT, 0);
};
I call my mesh generation function outside of the main while loop, then I draw the mesh in my main while loop.
Debugging my program through RenderDoc gives me the error, "No vertex shader bound at draw!" Without the geometry shader (keeping everything else roughly the same), I do not get any errors in RenderDoc. I tried updating my graphics drivers, but I am just getting the same error. Please help me, I feel like I am losing my mind.

Answer 1

In the fragment shader gsColor is defined at a vec4 variable but in the geometry shader it is declared a vec3 variable