I've been working on OpenGL for a while now, and I'm now working at diffuse lighting. I've set up a way to change the light source, but my object acts as if it were in the same place each time.
I've continued checking whether or not my fragment shader and vertex shader is correct, but no problems seem to arise.
This is the light position sent to the core shader:
vec3 lightPos0 = vec3(0.f, 0.f, 2.f);
glUniform3fv(glGetUniformLocation(coreShader.getID(), "lightPos0"), 1, value_ptr(lightPos0));
And here are the fragment and vertex shaders (with all usual variables implied to exist):
#version 450
layout (location = 0) in vec3 vertex_position;
layout (location = 1) in vec3 vertex_color;
layout (location = 2) in vec2 vertex_texcoord;
layout (location = 3) in vec3 vertex_normal;
out vec3 vs_position;
out vec3 vs_color;
out vec2 vs_texcoord;
out vec3 vs_normal;
uniform mat4 ModelMatrix;
uniform mat4 ViewMatrix;
uniform mat4 ProjectionMatrix;
void main()
{
vs_position = vec4(ModelMatrix * vec4(vertex_position, 1.f)).xyz;
vs_color = vertex_color;
vs_texcoord = vec2(vertex_texcoord.x, vertex_texcoord.y * -1.f);
vs_normal = mat3(ModelMatrix) * vertex_normal;
gl_Position = ProjectionMatrix * ViewMatrix * ModelMatrix * vec4(vertex_position, 1.f);
}
#version 450
in vec3 vs_position;
in vec3 vs_color;
in vec2 vs_texcoord;
in vec3 vs_normal;
out vec4 fs_color;
uniform sampler2D texture0;
uniform sampler2D texture1;
uniform vec3 lightPos0;
void main()
{
//Ambient light
vec3 ambientLight = vec3(0.1f, 0.1f, 0.1f);
//Diffuse light
vec3 posToLightDirVec = normalize(lightPos0 - vs_position);
vec3 diffuseColor = vec3(1.f, 1.f, 1.f);
float diffuse = max(dot(posToLightDirVec, vs_normal), 0.0);
vec3 diffuseFinal = diffuseColor * diffuse;
fs_color =
(texture(texture0, vs_texcoord)) * vec4(vs_color, 1.f)
* (vec4(ambientLight, 1.f) + vec4(diffuseFinal, 1.f));
}
If you actually managed to take all of this and get it to about what this program looks like, you would notice that it wouldn't quite matter where you put the light point. You would always have to move back slightly to actually see anything. Also, you would see that it isn't quite diffuse, but more like specular lighting. If you need any more code, ask me in the comments.
