Opengl 20

// Varying inputs automatically interpolated by the GPU varying vec3 v_NormalInterp; varying vec3 v_LightDir; void main() // Normalize our vectors to correct interpolation skewing vec3 normal = normalize(v_NormalInterp); vec3 lightDir = normalize(v_LightDir); // Standard Lambertian diffuse reflection math float diffuseIntensity = max(dot(normal, lightDir), 0.0); // Output final color (Base white multiplied by light intensity) vec3 baseColor = vec3(1.0, 1.0, 1.0); gl_FragColor = vec4(baseColor * diffuseIntensity, 1.0); Use code with caution. Modern Relevance: Why Is It Still Around?

Initializing OpenGL 2.0 requires requesting a core context (though 2.0 didn't deprecate fixed functions yet):

Learn to write Vertex and Fragment shaders using GLSL . opengl 20

And deep in the heart of the driver, the old, rigid pipeline didn't die. It simply put on a new cloak. A call to glBegin(GL_TRIANGLES) was now secretly translated into a short, efficient GLSL shader behind the scenes. The dinosaur had not been replaced. It had learned to code.

Mark Kilgard, a principal engineer at NVIDIA and a knight of the OpenGL Architectural Review Board (ARB), stared at the glowing runes on his monitor. For a decade, the OpenGL way had been pure: glBegin() , glVertex() , glEnd() . A state machine of immutable laws. You told the hardware the light was a point source, the material was shiny bronze, and the transformation was a perspective projection. The hardware obeyed, predictably, beautifully. But it was rigid. // Varying inputs automatically interpolated by the GPU

OpenGL 2.0 allowed developers to replace the fixed transformation and lighting stages with a vertex shader. This small program runs on the GPU for every vertex of the 3D model. It allowed for custom transformations, skeletal animation calculations, and per-vertex lighting that could be passed to the next stage.

High-level, C-like language for creating custom graphics effects on the GPU. And deep in the heart of the driver,

: Considered "legacy" but still widely used as a minimum requirement for many lightweight apps and browsers. Mobile Variant OpenGL ES 2.0