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OpenGL Shading Language (GLSL) is a high-level shading language with a syntax based on the C programming language. It was created by the OpenGL ARB (OpenGL Architecture Review Board) to give developers more direct control of the graphics pipeline without having to use ARB assembly language or hardware-specific languages.
ARB assembly language is a low-level shading language, which can be characterized as an assembly language. It was created by the OpenGL Architecture Review Board (ARB) to standardize GPU instructions controlling the hardware graphics pipeline.
However, their proposal for a C-style shading language was eventually completed, resulting in the current formulation of the OpenGL Shading Language (GLSL or GLslang). Like the assembly-like shading languages it was replacing, it allowed replacing the fixed-function vertex and fragment pipe with shaders , though this time written in a C-like ...
This approach served as a segue that would continue providing the fixed-function API abstraction most developers were experienced with while allowing further development and enhancements of the newer shader-based architectures. OpenGL, OpenGL ES and DirectX are all 3D graphics APIs that went through the transition from the fixed-function ...
It is now used by Unity [4] and OGRE to translate Cg/HLSL shaders into GLSL for mobile platforms. [5] The project has been criticized for generating low-quality, bloated code. At the XDC2014, Matt Turner pointed out that many benchmark examples in Mesa's shader-db are generated by conversion and of poor quality. [6] Free and open-source ...
The Blinn–Phong reflection model, also called the modified Phong reflection model, is a modification developed by Jim Blinn to the Phong reflection model. [1]Blinn–Phong is a shading model used in OpenGL and Direct3D's fixed-function pipeline (before Direct3D 10 and OpenGL 3.1), and is carried out on each vertex as it passes down the graphics pipeline; pixel values between vertices are ...
An example of two kinds of shadings: Flat shading on the left and Phong shading on the right. Phong shading is an improvement on Gouraud shading, and was one of the first computer shading models developed after the basic flat shader, greatly enhancing the appearance of curved surfaces in renders.
For example: Create an FBO and bind it. Attach the color buffer (either as a RenderBuffer or a texture) to the FBO. Attach the depth buffer (either as a RenderBuffer or a texture) to the FBO. Bind the native window FrameBuffer (id=0) Render the texture to screen with a pixel shader, dependent on both the Color information and depth information.