Vec3 Sample Pack Install And Use

This lets us bind vertices with normals, colors, texture coordinates, etc.

Most modern browsers support WebGL, even mobile browsers Enables in-browser 3D games Enables realtime experimentation with glsl shader code Samples from Shadertoy.com 5 6 Vulkan Vulkan is the next generation of OpenGL: a cross-platform open standard aimed at pure performance on modern hardware Compared to OpenGL, Vulkan- Reduces CPU load Has better support of multi-cpu core architectures Gives finer control of the GPU The Talos Principle running on Vulkan (via --but- Drawing a few primitives can take 1000s of lines of code Intended for game engines and code that must be very well optimized 6 7 OpenGL in Java - choices JOGL: Java bindings for OpenGL jogamp.orgjogl LWJGL: Lightweight Java Games Library JOGL apps can be deployed as applications or as applets, making it suitable for educational web demos and cross-platform applications.

Image from Wikipedia 7 8 OpenGL architecture The CPU (your processor and friend) delivers data to the GPU (Graphical Processing Unit).

The GPU takes in streams of vertices, colors, texture coordinates and other data; constructs polygons and other primitives; then uses shaders to draw the primitives to the screen pixel-by-pixel.

The GPU processes the vertices according to the state set by the CPU; for example, every trio of vertices describes a triangle.

Implementing the rendering pipeline is a joint effort between you and the GPU.

You ll write vertex and fragment shaders.

And maybe others.) 8 9 The OpenGL rendering pipeline An OpenGL application assembles sets of primitives, transforms and image data, which it passes to OpenGL s GLSL shaders.

Vertex shaders process every vertex in the primitives, computing info such as position of each one.

Fragment shaders compute the color of every fragment of every pixel covered by every primitive.

Application Vertex Primitives and image data Transform and lighting Primitive assembly Geometry Clipping Texturing Fragment Fog, antialiasing Framebuffer Alpha, stencil, depth tests Framebuffer blending The OpenGL rendering pipeline (a massively simplified view) 9 10 Shader gallery I Above: Demo of Microsoft s XNA game platform Right: Product demos by nvidia (top) and ATI (bottom) 10 11 OpenGL: Shaders OpenGL shaders give the user control over each vertex and each fragment (each pixel or partial pixel) interpolated between vertices.

During rasterization, values like position, color, depth, and others are interpolated across the polygon.

The line glposition mvp vpos; applies our model-view-projection matrix to calculate the correct vertex position in perspective coordinates.

The fragment shader implements basic ambient lighting by setting its one output, fragmentcolor, to a constant.

GLSL The language design in GLSL is strongly based on ANSI C, with some C added.

There is no implicit casting (type promotion): float foo 1; fails because you can t implicitly cast int to float.

Explicit type casts are done by constructor: vec3 foo vec3(1.0, 2.0, 3.0); vec2 bar vec2(foo); Drops foo.z Function parameters are labeled as in, out, or uniform.

Functions are called by value-return, meaning that values are copied into and out of parameters at the start and end of calls.

Vec3 Sample Pack Install And Use

OpenGL GLSL API - setup To install and use a shader in OpenGL: Create one or more empty shader objects with glcreateshader.

Vertex shader Fragment shader Compiler Program Linker OpenGL 17 18 Shader gallery II Above: Kevin Boulanger (PhD thesis, Real-Time Realistic Rendering of Nature Scenes with Dynamic Lighting, 2005) Above: Ben Cloward ( Car paint shader ) 18 19 What will you have to write It s up to you to implement perspective and lighting.

Pass geometry to the GPU 2.

Calculate lighting on the GPU 19 20 Geometry in OpenGL The atomic datum of OpenGL is a vertex.

Specify arbitrary details The fundamental primitives in OpenGL are the line segment and triangle.

Very hard to get wrong vertices ordering surface 20 21 Geometry in OpenGL Vertex buffer objects store arrays of vertex data--positional or descriptive.

With a vertex buffer object ( VBO ) you can compute all vertices at once, pack them into a VBO, and pass them to OpenGL en masse to let the GPU processes all the vertices together.

To group different kinds of vertex data together, you can serialize your buffers into a single VBO, or you can bind and attach them to Vertex Array Objects.