Modern Game Techniques Computer Graphics at Stanford 现代计机图形技术在斯坦福的游戏.pptVIP

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Modern Game Techniques Computer Graphics at Stanford 现代计机图形技术在斯坦福的游戏.ppt

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Modern Game Techniques Computer Graphics at Stanford 现代计机图形技术在斯坦福的游戏

Announcments Sign up for crits! Reading for Next Week FvD 16.1-16.3 – local lighting models GL 5 – lighting GL 9 (skim) – texture mapping Modern Game Techniques CS248 Lecture Nov 13 Andrew Adams Overview The OpenGL Pipeline Vertex and Fragment Shaders Multipass Techniques Culling and Collision Detection The OpenGL Pipeline The OpenGL Pipeline The OpenGL Pipeline The OpenGL Pipeline The OpenGL Pipeline The OpenGL Pipeline The OpenGL Pipeline The OpenGL Pipeline The OpenGL Pipeline with Shaders The OpenGL Pipeline with Shaders The OpenGL Pipeline with Shaders The OpenGL Pipeline with Shaders The OpenGL Pipeline with Shaders The OpenGL Pipeline with Shaders GLSL Types Float types: float, vec2, vec3, vec4, mat2, mat3, mat4 Bool types: bool, bvec2, bvec3, bvec4 Int types: int, ivec2, ivec3, ivec4 Texture types: sampler1D, sampler2D, sampler3D GLSL Types A variable can optionally be: Const Uniform Can be set from c, outside glBegin/glEnd Attribute Can be set from c, per vertex Varying Set in the vertex shader, interpolated and used in the fragment shader Creating your own shaders Get at the extension functions use glew / Load the shaders as strings Compile them Link them into a ‘program’ Enable the program Draw something (Live Demo) References A great tutorial and reference: /opengl/glsl/ The spec for GLSL, includes all the available builtin functions and state: /documentation/glsl/ The OpenGL ‘orange book’ on shaders is also good Multipass Techniques Many cool effects are easier to achieve by rendering the scene multiple times: Render the scene Read the scene into a texture Render that texture on the screen in some interesting way Motion Blur 1) T = empty texture 2) Render a slightly dimmed T 3) Render the scene 4) Copy the framebuffer into T 5) Goto 2 (Live Demo) Motion Blur: Two Questions Question 1: What’s incorrect about this motion blur? (from a sampling point of view) Question 2: How could this be modified to make a zoom blur? Sharpen Filter Render the