GLSL shadow multiplication doesn't work - c++

Question

I'm in front of a very strange problem which seems to originate from a simple multiplication in the fragment shader
I'm trying to calculate shadows using a framebuffer that renders only the depths from "light's perspective" which is a common tecnique for beginners easier to implement
Fragment Shader:
#version 330 core
uniform sampler2D parquet;
uniform samplerCube depthMaps[15];
in vec2 TexCoords;
out vec4 color;
in vec3 Normal;
in vec3 FragPos;
uniform vec3 lightPos[15];
uniform vec3 lightColor[15];
uniform float intensity[15];
uniform float far_plane;
uniform vec3 viewPos;
float ShadowCalculation(vec3 fragPos, vec3 lightPost, samplerCube depthMaps)
{
vec3 fragToLight = fragPos - lightPost;
float closestDepth = texture(depthMaps, fragToLight).r;
// original depth value
closestDepth *= far_plane;
float currentDepth = length(fragToLight);
float bias = 0.05;
float shadow = currentDepth - bias > closestDepth ? 1.0 : 0.0;
return shadow;
}
void main()
{
vec3 norm = normalize(Normal);
vec3 lightDir = normalize(lightPos[0] - FragPos);
float diff = max(dot(norm, lightDir), 0.0);
vec3 diffuse = diff * lightColor[0];
float _distance = length(vec3(FragPos - lightPos[0]));
float attenuation = 1.0 / pow(_distance +1, 2);
if(attenuation > 1.0) attenuation = 1.0;
float intens = intensity[0];
if(intensity[0] > 150) intens = 150.0f;
vec3 resulta = (diffuse * attenuation) * intens;
//texture color
vec3 tCol = vec3(texture(parquet, TexCoords));
//gamma correction
tCol.rgb = pow(tCol.rgb, vec3(0.45));
vec3 colors = resulta * tCol * (1.0f - ShadowCalculation(FragPos, lightPos[0], depthMaps[0]));
color = vec4(colors, 1.0f);
}
The last multiplication inside main() behaves strangely, multiplying the result of the diffuse light by the texture color renders nicely (so we have no shadows, just diffuse lightning)
//works
vec3 colors = resulta * tCol;
Multiplying the diffuse light by the shadow results renders also nicely (now we have no textures)
//works
vec3 colors = resulta * (1.0f - ShadowCalculation(FragPos, lightPos[0], depthMaps[0]));
Doing all togheter, renders just a black screen. I've tried all sort of things in the fragment shader, but none worked.
Lastly, here is the fragment shader used to render the cubemap:
#version 330 core
in vec4 FragPos;
uniform vec3 lightPos;
uniform float far_plane;
void main()
{
float lightDistance = length(FragPos.xyz - lightPos);
// map to [0;1] range by dividing by far_plane
lightDistance = lightDistance / far_plane;
gl_FragDepth = lightDistance;
}
Can you spot any logical error? I'm using uniforms array buffers since i'll later need multiple lights at once

Answer 1

After a while trying to visually debug the shader's output I finally found the error, I was binding the depthmap's cubemap texture incorrectly and this caused the strange behaviour I was seeing in the last multiplication
Lesson learned: It' not always fragment's fault