Part of this is because the new shaders require graphics cards often not found in laptops. We will cover 2, and the other newer ones we will not. for shadow, or achieve specific shading effects (such as toon-shading)) 4 types of shaders available to us. Note that we can run this loop multiple times (e.g.

Read only – Used only in vertex shader Varying – Variables passed from one shader to another Uniform – Example pass in a texture Attribute – Passing in different vertices or normals for every vertex, only used in the vertex shaderģ6 Order matters… Info is only passed in one direction (starting with vertex shader) Read/Write in Vertex Shader Attributes – Input value which change every vertex.

Mac does split support (only 3.0+ or only 1.2 in / out – in is the variable being passed in, out is the variable being passed out Read-only in fragment shader. GLSL is also at 4.6 When OpenGL 3.1 was introduced, GLSL changed versioning to match (to 3.1), which was previous 1.3.1 3.0 -> 3.1 (2009) is said to be the “big move” where fixed pipeline is considered deprecated. OpenGL 2.0 (2004) introduces the idea of shaders OpenGL SL 1.0 (or 1.1) is a part of OpenGL 2.0 Currently, OpenGL is at 4.6 (2017). matrix manipulation)! GPU is multi-core (multi-processor) Imagine that you have one processor per pixel, how would you program what the processor should do? GPU is now optimized to work with textures Modern GPUs come with large amounts of memory, almost comparable to CPUsġ4 Versions of OpenGL and GLSL (and why you need to care) GPU is dedicated to floating point operations (a traditionally expensive operation on a CPU) It is especially optimized for linear algebra (e.g. IPhone intentional, because you have to use shaders to do graphics for openGL.ġ0 Why GPU? Having two (CPU and GPU) is better than one… GPGPU General Purpose Graphics Processing Unit Utilize graphics card for computation Do work other than graphicsĨ Old Fixed-Function Not to exciting, what we’ve been using

Graphics History Software Rendering Old-fashioned way (Use ray casting) Fixed-Function Immediate Mode (What we have used) Programmable Pipeline (~2001) GL Shading Language (What we will learn) CUDA/OpenCL (GPGPU) (~2008) General Purpose GPU Programmingħ General Purpose Graphics Processing Unit 1 Lecture 13: OpenGL Shading Language (GLSL)ĬOMP 175: Computer Graphics April 18, 2018Ģ Motivation Last week, we discussed the many of the new “tricks” in Graphics require low-level access to the Graphics pipeline For example, using textures, which is a pain in regular OpenGL.ģ Programmable Pipeline (~2001) CUDA/OpenCL (GPGPU) (~2008)

Opengl 4.6 reference sheet