[5330] | 1 | #ifdef HAVE_CONFIG_H |
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| 2 | # include "config.h" |
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| 3 | #endif |
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| 4 | |
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| 5 | #ifdef HAVE_GL_GL_H |
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| 6 | # include <GL/gl.h> |
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| 7 | #elif HAVE_OPENGL_GL_H |
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| 8 | # include <OpenGL/gl.h> |
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| 9 | #endif |
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[5292] | 10 | #include <math.h> |
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| 11 | #include "camera.h" |
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| 12 | #include "globals.h" |
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[5330] | 13 | #include "vector.h" |
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[5292] | 14 | |
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[5330] | 15 | static const vector up = {0.0, 0.0, 1.0}; |
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[5380] | 16 | |
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[5385] | 17 | void camera_home(void){ |
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| 18 | vector releye; |
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| 19 | anugavis.eye[0] = anugavis.minX; |
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| 20 | anugavis.eye[1] = anugavis.minY; |
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| 21 | anugavis.eye[2] = 0; |
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| 22 | anugavis.focus[0] = anugavis.minX + (anugavis.maxX - anugavis.minX) / 2; |
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| 23 | anugavis.focus[1] = anugavis.minY + (anugavis.maxY - anugavis.minY) / 2; |
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| 24 | anugavis.focus[2] = 0; |
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| 25 | vsub(anugavis.eye, anugavis.focus, releye); |
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| 26 | anugavis.eye[2] = vlen(releye); |
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| 27 | } |
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| 28 | |
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[5330] | 29 | void camera_pitch(float theta){ |
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[5292] | 30 | float c = cos(theta); |
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| 31 | float s = sin(theta); |
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[5330] | 32 | float x; |
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| 33 | float y; |
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| 34 | float z; |
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| 35 | vector releye; |
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| 36 | vector newreleye; |
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| 37 | vector axis; |
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| 38 | float dot; |
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| 39 | float len; |
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| 40 | vsub(anugavis.eye, anugavis.focus, releye); |
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| 41 | /* Check we're not too near the vertical */ |
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| 42 | dot = vdot(up, releye); len = vlen(releye); |
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| 43 | if(((dot > 0.99 * len) && (theta > 0)) || |
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| 44 | ((dot < -0.99 * len) && (theta < 0))) return; |
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| 45 | /* Calculation from glRotatef manpage. */ |
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| 46 | vcross(releye, up, axis); |
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| 47 | vscale(axis, 1.0/vlen(axis), axis); |
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| 48 | x = axis[0]; y = axis[1]; z = axis[2]; |
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| 49 | newreleye[0] = |
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| 50 | releye[0] * (x*x*(1-c)+c) + |
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| 51 | releye[1] * (x*y*(1-c)-z*s) + |
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| 52 | releye[2] * (x*z*(1-c)+y*s); |
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| 53 | newreleye[1] = |
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| 54 | releye[0] * (y*x*(1-c)+z*s) + |
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| 55 | releye[1] * (y*y*(1-c)+c) + |
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| 56 | releye[2] * (y*z*(1-c)-x*s); |
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| 57 | newreleye[2] = |
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| 58 | releye[0] * (z*x*(1-c)-y*s) + |
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| 59 | releye[1] * (z*y*(1-c)+x*s) + |
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| 60 | releye[2] * (z*z*(1-c)+c); |
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| 61 | vadd(newreleye, anugavis.focus, anugavis.eye); |
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[5292] | 62 | } |
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| 63 | |
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[5385] | 64 | void camera_strafe(float dist){ |
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[5330] | 65 | vector releye; |
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[5385] | 66 | vector dir; |
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[5330] | 67 | vsub(anugavis.eye, anugavis.focus, releye); |
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[5385] | 68 | vcross(releye, up, dir); |
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| 69 | vscale(dir, dist/vlen(dir), dir); |
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| 70 | vadd(anugavis.eye, dir, anugavis.eye); |
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| 71 | vadd(anugavis.focus, dir, anugavis.focus); |
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[5330] | 72 | } |
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[5292] | 73 | |
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[5330] | 74 | void camera_track(float dist){ |
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| 75 | vector dir = {0, 0, 0}; |
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| 76 | vsub(anugavis.eye, anugavis.focus, dir); |
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| 77 | dir[2] = 0; |
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| 78 | vscale(dir, dist/vlen(dir), dir); |
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| 79 | vadd(anugavis.eye, dir, anugavis.eye); |
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| 80 | vadd(anugavis.focus, dir, anugavis.focus); |
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[5292] | 81 | } |
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[5339] | 82 | |
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[5385] | 83 | void camera_yaw(float theta){ |
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| 84 | float c = cos(theta); |
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| 85 | float s = sin(theta); |
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[5339] | 86 | vector releye; |
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[5385] | 87 | vector newreleye; |
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[5339] | 88 | vsub(anugavis.eye, anugavis.focus, releye); |
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[5385] | 89 | newreleye[0] = releye[0] * c + releye[1] * s; |
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| 90 | newreleye[1] = releye[0] * -1 * s + releye[1] * c; |
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| 91 | newreleye[2] = releye[2]; |
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| 92 | vadd(newreleye, anugavis.focus, anugavis.eye); |
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[5339] | 93 | } |
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[5379] | 94 | |
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| 95 | void camera_zoom(float dist){ |
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| 96 | vector releye; |
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| 97 | float len; |
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| 98 | vsub(anugavis.focus, anugavis.eye, releye); |
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| 99 | if((len = vlen(releye)) < dist) return; |
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| 100 | vscale(releye, dist/len, releye); |
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| 101 | vadd(anugavis.eye, releye, anugavis.eye); |
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| 102 | } |
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