By Anton Gerdelan
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Extra resources for Anton's OpenGL 4 Tutorials
Vert. 0); } GLSL has some built-in data types that we can see here: vec3 is a 3d vector that can be used to store positions, directions, or colours. vec4 is the same but has a fourth component which, in this variable, is used to determine perspective. 0, which means "don't calculate any perspective". We can also see the in key-word for input to the programme from the previous stage. In this case the vertex_position_local is one of the vertex points from the object that we are drawing. GLSL also has an out key-word for sending a variable to the next stage.
9. The GLSL language from OpenGL versions 3 to 4 is almost identical, so we can port between versions without changing the code. 0 added tessellation control and tessellation evaluation shaders. These, of course, can not be rolled back to earlier versions. 6 - #version 430 GLSL Operators GLSL has the same operators as C, with the exception of pointers. 30. GLSL Data Types The most commonly used data types in GLSL are in the table below. org/documentation/glsl/). void - nothing - Functions that do not return a value bool - Boolean value as in C++ int - Signed integer as in C float - Floating-point scalar value as in C vec3 - 3d floating-point value - Points and direction vectors vec4 - 4d floating-point value - Points and direction vectors mat3 - 3x3 floating-point matrix - Transforming surface normals mat4 - 4x4 floating-point matrix - Transforming vertex positions sampler2D - 2d texture loaded from an image file samplerCube - 6-sided sky-box texture sampler2DShadow - shadow projected onto a texture If you leave out the version tag, OpenGL fall back to an earlier default - it's always better to specify the version.
Parameter fetching code can go just about anywhere. Include the GLEW header file before GLFW. OpenGL 4 Shaders Shaders tell OpenGL how to draw, but we don't have anything to draw yet - we will cover that in the vertex buffers article. If you would rather skip the introduction, you can jump straight to the Example Shaders and get them loaded into GL with the Minimal C Code. Overview Shaders are mini-programmes that define a style of rendering. They are compiled to run on the specialised GPU (graphics processing unit).
Anton's OpenGL 4 Tutorials by Anton Gerdelan