Mipmaps. Lecture 35. Robb T. Koether. Hampden-Sydney College. Wed, Nov 18, 2015
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1 Mipmaps Lecture 35 Robb T. Koether Hampden-Sydney College Wed, Nov 18, 2015 Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
2 Outline 1 Discrete Sampling 2 Mipmaps 3 Generating Mipmaps 4 Programming Mipmaps 5 Interpolating between Mipmaps 6 Assignment 20 7 Assignment 21 Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
3 Discrete Sampling Suppose we are drawing a 2-dimensional black-and-white checkerboard pattern. Suppose that the surface is close enough to the camera and oriented just right that each texel matches exactly one pixel. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
4 Discrete Sampling Consider one row of pixels and texels, where the pixels and texels are the same size. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
5 Discrete Sampling Using the nearest texel, the pixels will be colored alternately black and white. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
6 Discrete Sampling Using the nearest texel, the pixels will be colored alternately black and white. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
7 Discrete Sampling What if the texels were somewhat smaller than the pixels? Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
8 Discrete Sampling What if the texels were somewhat smaller than the pixels? Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
9 Discrete Sampling What if the texels were somewhat smaller than the pixels? Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
10 Discrete Sampling What if the texels are almost half the size of the pixels? Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
11 Discrete Sampling What if the texels are almost half the size of the pixels? Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
12 Discrete Sampling Uh oh. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
13 Discrete Sampling What will happen when the texels are exactly half the width of a pixel? Exactly one fourth? Exactly one third? Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
14 Outline 1 Discrete Sampling 2 Mipmaps 3 Generating Mipmaps 4 Programming Mipmaps 5 Interpolating between Mipmaps 6 Assignment 20 7 Assignment 21 Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
15 Mipmaps Definition (Mipmap) A mipmap is a reduced copy of a texture, with the colors averaged. mip = multum in parvo = many things in a small place. Rather than use the nearest texels or the average of the four texels that happen to be nearest to the pixel, we can create smaller and smaller copies of the entire texture and use their texels. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
16 Mipmaps If the original texture is 64 64, then we should create copies at the scales of 32 32, 16 16, 8 8, 4 4, 2 2, and 1 1. If the original texture is 64 16, then we should create copies at the scales of 32 8, 16 4, 8 2, 4 1, 2 1, and 1 1. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
17 Mipmap Levels The original texture is level 0. The next level is level 1. And so on. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
18 Mipmaps One texel Level 0 Mipmap Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
19 Mipmaps One texel Level 1 Mipmap Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
20 Mipmaps One texel Level 2 Mipmap Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
21 Mipmaps One texel Level 3 Mipmap Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
22 Mipmaps One texel Level 4 Mipmap Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
23 Mipmaps One texel Level 5 Mipmap Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
24 Mipmaps One texel Level 6 Mipmap Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
25 Mipmaps One texel Level 0 Mipmap Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
26 Mipmaps One texel Level 0 Mipmap Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
27 Mipmaps One texel Level 1 Mipmap Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
28 Mipmaps One texel Level 2 Mipmap Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
29 Mipmaps One texel Level 3 Mipmap Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
30 Mipmaps One texel Level 4 Mipmap Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
31 Mipmaps One texel Level 5 Mipmap Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
32 Mipmaps One texel Level 6 Mipmap Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
33 Outline 1 Discrete Sampling 2 Mipmaps 3 Generating Mipmaps 4 Programming Mipmaps 5 Interpolating between Mipmaps 6 Assignment 20 7 Assignment 21 Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
34 Generating Mipmaps If we hand-code a texture, then we also hand-code the mipmaps. (See demo.) The website includes an option to create mipmaps in the.dds file. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
35 Outline 1 Discrete Sampling 2 Mipmaps 3 Generating Mipmaps 4 Programming Mipmaps 5 Interpolating between Mipmaps 6 Assignment 20 7 Assignment 21 Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
36 Programming Mipmaps Mipmaps are implemented using the same function glteximage2d() that we used to set the original texture. The second parameter is the level. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
37 Screen Shots Close-up of Level 0 Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
38 Screen Shots Close-up of Level 1 Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
39 Screen Shots Close-up of Level 2 Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
40 Screen Shots Close-up of Level 3 Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
41 Screen Shots Close-up of Levels 4, 5, and 6 Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
42 Using Mipmaps When using mipmaps, we have two separate choices. Whether to use the nearest texel in a mipmap or to interpolate among the 4 nearest texels. Whether to use the nearest mipmap or to interpolate between the two nearest mipmaps. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
43 Using Mipmaps Thus, the combinations of choices are Nearest texel and nearest mipmap Nearest texel and interpolate mipmaps Interpolate texels and nearest mipmap Interpolate texels and interpolate mipmaps Which is the most expensive? Which gives the best results? Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
44 Outline 1 Discrete Sampling 2 Mipmaps 3 Generating Mipmaps 4 Programming Mipmaps 5 Interpolating between Mipmaps 6 Assignment 20 7 Assignment 21 Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
45 Interpolating Between Mipmaps Assume that a single color has been selected from each of the two nearest mipmaps (from either the nearest texel or an average of texels). Compute the scale factor r between the level 0 (original) mipmap and the polygon. Then compute λ = log 2 r. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
46 Interpolating Between Mipmaps The value of λ tells us which mipmap to use. If λ = 0, use level 0. If λ = 1, use level 1. If λ = 2, use level 2, etc. What if λ = 1.5? Then we interpolate between level 1 and level 2. Different scale factors may be used for different regions of a single polygon. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
47 Example Suppose λ = 1.3 and the level 1 mipmap color is yellow (1, 1, 0) and the level 2 mipmap color is cyan (0, 1, 1). Then the interpolated color is 0.7(1, 1, 0) + 0.3(0, 1, 1) = (0.7, 1.0, 0.3). Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
48 Interpolating Mipmaps Interpolating Mipmaps gltexparameteri(gl_texture_2d, GL_TEXTURE_MIN_FILTER, method); Use the gltexparameter*() function to set the method of applying mipmap filters. The third parameter is one of GL_NEAREST_MIPMAP_NEAREST GL_NEAREST_MIPMAP_LINEAR GL_LINEAR_MIPMAP_NEAREST GL_LINEAR_MIPMAP_LINEAR Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
49 Trilinear Interpolation If we interpolate bilinearly within mipmaps and then interpolate those values between mipmaps, we get trilinear interpolation. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
50 Trilinear Interpolation How many individual interpolations are required? Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
51 Trilinear Interpolation Four in the s direction. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
52 Trilinear Interpolation Four in the s direction. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
53 Trilinear Interpolation Two more in the t direction. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
54 Trilinear Interpolation Two more in the t direction. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
55 Trilinear Interpolation One more between the mipmap levels. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
56 Trilinear Interpolation One more between the mipmap levels. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
57 Trilinear Interpolation A total of 7 interpolations are required. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
58 Outline 1 Discrete Sampling 2 Mipmaps 3 Generating Mipmaps 4 Programming Mipmaps 5 Interpolating between Mipmaps 6 Assignment 20 7 Assignment 21 Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
59 Assignment 20 Assignment 20 Add a water texture to the water. Add textures to the boat and its cabin. Turn in by Monday, November 30. Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
60 Outline 1 Discrete Sampling 2 Mipmaps 3 Generating Mipmaps 4 Programming Mipmaps 5 Interpolating between Mipmaps 6 Assignment 20 7 Assignment 21 Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
61 Assignment 21 Assignment 21 Add grass. (See handout.) Robb T. Koether (Hampden-Sydney College) Mipmaps Wed, Nov 18, / 31
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