OpenGL Graphics Textures. Quiz You didn't see that coming!

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Presentation transcript:

OpenGL Graphics Textures

Quiz You didn't see that coming!

1. What is OpenGL?

2. What is a vertex?

3. What are the three steps to render with depth testing?

4. What is the difference between an orthographic and a perspective projection matrix?

5. What are the three components of the fixed functionality lighting model?

Textures

What is a Texture? Image applied to geometry.tga,.jpg,.png files 1, 2 or 3 dimensional!

Texture Coordinates Vertex attribute Values between 0 and 1 1, 2 or 3-dimensional OpenGL will interpolate between the vertices

TextureTriangle

Sampling Textures Exceedingly rare that the texture will fit the geometry exactly We need a way of mapping to the best representative texel Nearest-neighbour filtering Bilinear filtering

Mipmaps Used to improve the sampling quality

Mipmaps Can specify mipmap level when loading a texture into OpenGL glGenerateMipmap() Trilinear filtering

OpenGL Texture Objects Stores a texture in GPU memory and holds texture properties glGenTextures() glBindTexture() glTexImage2D() glTexParamf() glDeleteTextures()

Demo

Questions?