| 52 | } |
| 53 | |
| 54 | GLuint createexpmodtex(int size, float minval) |
| 55 | { |
| 56 | uchar *data = new uchar[size*size], *dst = data; |
| 57 | loop(y, size) loop(x, size) |
| 58 | { |
| 59 | float dx = 2*float(x)/(size-1) - 1, dy = 2*float(y)/(size-1) - 1; |
| 60 | float z = max(0.0f, 1.0f - dx*dx - dy*dy); |
| 61 | if(minval) z = sqrtf(z); |
| 62 | else loopk(2) z *= z; |
| 63 | *dst++ = uchar(max(z, minval)*255); |
| 64 | } |
| 65 | GLuint tex = 0; |
| 66 | glGenTextures(1, &tex); |
| 67 | createtexture(tex, size, size, data, 3, true, false, GL_ALPHA); |
| 68 | delete[] data; |
| 69 | return tex; |
| 70 | } |
| 71 | |
| 72 | static struct expvert |
| 73 | { |
no test coverage detected