Creating spotlight in OpenGL scene
- by Victor Oliveira
Im studying OpenGL and trying to create a spot light at my application. The code that Im using for my #vertex-shader is below:
#:vertex-shader #{
#version 150 core
in vec3 in_pos;
in vec2 in_tc;
out vec2 tc;
glLightf(GL_LIGHT0, GL_SPOT_CUTOFF, 20.0f);
GLfloat spot_direction[] = { -1.0, -1.0, 0.0 };
glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, spot_direction);
glEnable(GL_LIGHT0);
void main() {
vec4 pos= vec4(vec3(1.0)*in_pos - vec3(1.0), 1.0);
pos.z=0.0;
gl_Position = pos;
tc = in_tc;
}
}
The thing is, everytime Im trying to run the code an Error that says:
Type: other, Source: api, ID: 131169, Severity: low
Message: Framebuffer detailed info: The driver allocated storage for renderbuffer 1.
len = 157, written = 0
failed to compile vertex shader of deferred: directional
info log for shader deferred: directional
vertex info log for shader deferred: directional:
ERROR: Unbound variable: when
Specifications:
Renderer: GeForce GTX 580/PCIe/SSE2
Version: 3.3.0 NVIDIA 319.17
GLSL: 3.30 NVIDIA via Cg compiler
Status: Using GLEW 1.9.0
1024 x 768
OS: Linux debian
I guess to create this spotlight is pretty much simple, but since Im really new to OpenGL I dont have a clue how to do it until now, even reading sources like:
http://www.glprogramming.com/red/chapter05.html#name3
Read also in some place that light spots can get really hard to understand, but I cant avoid this step right now since Im following my lecture schedule. Could anybody help me?
