git.wh0rd.org / ICEs.git / blame
| Commit | Line | Data |
|---|---|---|
| bd3239d2 MF |
1 | static __inline__ int IS_INF_OR_NAN(float x) |
| 2 | { | |
| 3 | union { | |
| 4 | float f; | |
| 5 | int i; | |
| 6 | } tmp; | |
| 7 | tmp.f = x; | |
| 8 | return tmp.i; | |
| 9 | } | |
| 10 | ||
| 11 | static void simple_textured_triangle(float **v1) | |
| 12 | { | |
| 13 | float **v0; | |
| 14 | float **v2; | |
| 15 | typedef struct { | |
| 16 | float dx; | |
| 17 | float dy; | |
| 18 | int fsx; | |
| 19 | int fx0; | |
| 20 | int lines; | |
| 21 | } EdgeT; | |
| 22 | EdgeT eMaj; | |
| 23 | EdgeT eTop; | |
| 24 | EdgeT eBot; | |
| 25 | float oneOverArea; | |
| 26 | float **vMin; | |
| 27 | float **vMid; | |
| 28 | float **vMax; | |
| 29 | int vMin_fx; | |
| 30 | int vMin_fy; | |
| 31 | int vMid_fx; | |
| 32 | int vMid_fy; | |
| 33 | int vMax_fx; | |
| 34 | int vMax_fy; | |
| 35 | if (v1[0][1] <= v2[0][1]) { | |
| 36 | vMin = v0; | |
| 37 | vMax = v1; | |
| 38 | vMin_fy = v0[0][1]; | |
| 39 | } | |
| 40 | vMin_fx = vMin[0][0]; | |
| 41 | vMid_fx = | |
| 42 | vMid[4][0] ? ((vMid[4][0] * (float)2048) + | |
| 43 | 0.5F) : ((vMid[4][0] * (float)2048) - 0.5F); | |
| 44 | eMaj.dx = (vMax_fx - vMin_fx) * (1.0F / (float)2048); | |
| 45 | eMaj.dy = (vMax_fy - vMin_fy) * (1.0F / (float)2048); | |
| 46 | eTop.dx = (vMax_fx - vMid_fx) * (1.0F / (float)2048); | |
| 47 | eBot.dy = (vMid_fy - vMin_fy) * (1.0F / (float)2048); | |
| 48 | float area = eMaj.dx * eBot.dy - eBot.dx * eMaj.dy; | |
| 49 | if (IS_INF_OR_NAN(area)) | |
| 50 | return; | |
| 51 | oneOverArea = 1.0F / area; | |
| 52 | eBot.fx0 = vMin_fx; | |
| 53 | int scan_from_left_to_right; | |
| 54 | float eMaj_ds = (vMax[4][0] - vMin[4][0]); | |
| 55 | float eBot_ds; | |
| 56 | float stepx = oneOverArea * (eMaj_ds * eBot.dy - eMaj.dy * eBot_ds); | |
| 57 | int step = (stepx >= 0.0F) ? stepx : (stepx * (float)2048) - 0.5F; | |
| 58 | int subTriangle; | |
| 59 | int fxRightEdge = 0; | |
| 60 | for (subTriangle = 0; subTriangle <= 1; subTriangle++) { | |
| 61 | EdgeT *eRight; | |
| 62 | int lines; | |
| 63 | if (subTriangle == 0) { | |
| 64 | if (scan_from_left_to_right) { | |
| 65 | eRight = &eBot; | |
| 66 | lines = eRight->lines; | |
| 67 | } else { | |
| 68 | eRight = &eMaj; | |
| 69 | } | |
| 70 | } else { | |
| 71 | if (scan_from_left_to_right) { | |
| 72 | eRight = &eTop; | |
| 73 | } | |
| 74 | fxRightEdge = eRight->fsx; | |
| 75 | } | |
| 76 | while (lines > 0) { | |
| 77 | int end; | |
| 78 | int x; | |
| 79 | int y; | |
| 80 | x = 0; | |
| 81 | if (fxRightEdge <= x) | |
| 82 | end = 0; | |
| 83 | else | |
| 84 | end = fxRightEdge - x; | |
| 85 | if (end > 0 && y >= 0) { | |
| 86 | int i; | |
| 87 | char *rgb; | |
| 88 | for (i = 0; i < end; i++) { | |
| 89 | int it; | |
| 90 | char *texture; | |
| 91 | rgb[i] = texture[it]; | |
| 92 | it += step; | |
| 93 | } | |
| 94 | PutRowRGB(rgb); | |
| 95 | } | |
| 96 | } | |
| 97 | } | |
| 98 | } | |
| 99 | ||
| 100 | void *foo() | |
| 101 | { | |
| 102 | return simple_textured_triangle; | |
| 103 | } |