GLSL also gives us the texture coordinates that we assigned in OpenGL. This means that if you pass the texture id to the shader, you can replicate all the texturing done in OpenGL.
tutorial
GLSL also gives us the texture coordinates that we assigned in OpenGL. This means that if you pass the texture id to the shader, you can replicate all the texturing done in OpenGL.
Just like lighting and coloring, OpenGL will pass us the material information for objects, allowing us to light our objects just as they would be in the fixed function OpenGL state. This tutorial will show you how to get and use the material information on your lit objects.
Previously, we looked at simuling OpenGL per vertex lighting. Now we are going to learn how to do per pixel lighting, achieving a more realistic lighting effect.
GLSL also overwrites the default lighting in OpenGL, but once again, OpenGL passes all lighting information through to us in GLSL for us to use. This tutorial will teach you how to use this information to perform per-vertex lighting, identical to that in standard OpenGL.
Coloring in GLSL overwrites any colors you introduced into your application. But OpenGL can pass your colors to GLSL for you to use.
Validating shaders, allows us to find errors on run-time instead of the shader failing and producing corrupt output. HLSL does this upon compilation inside XNA, but we have to wait until out shader compiles, which happens at run time.GLSL is the OpenGL Shader Language, and is the OpenGL version of HLSL for DirectX. It allows us to manipulate the scene on a per vertex and per fragment basis, giving us total control.
If you want to create a game like Sim City, or an RPG, then you are going to need some sort of tiling engine. This breaks up the ground into a bunch of known images and places them on runtim. This saves us having extremely large image files for an entire map and also makes it customizable in-game.
While OpenGL is built for 3D rendering, it does also support 2D. This is where you want orthogonal projections, which are perfect for a Heads Up Display, or a menu system.
Textures by themselves are perfectly fine, you don't have to do anything with them. But have you ever wanted to load a movie into a 3D scene? Maybe you want to read a movie file, and display it on a quad moving around your scene. Well you can, but you have to do it frame, by frame.