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 | typedef struct sw_span { | |
| 12 | int x; | |
| 13 | int y; | |
| 14 | int end; | |
| 15 | float **attrStepX; | |
| 16 | int intTex[1]; | |
| 17 | int intTexStep[2]; | |
| 18 | } SWspan; | |
| 19 | static void simple_textured_triangle( float * * v1) | |
| 20 | { | |
| 21 | float * *v0; | |
| 22 | float * *v2; | |
| 23 | typedef struct { | |
| 24 | float dx; | |
| 25 | float dy; | |
| 26 | int fsx; | |
| 27 | int fx0; | |
| 28 | int lines; | |
| 29 | } EdgeT; | |
| 30 | EdgeT eMaj; | |
| 31 | EdgeT eTop; | |
| 32 | EdgeT eBot; | |
| 33 | float oneOverArea; | |
| 34 | float * *vMin; | |
| 35 | float * *vMid; | |
| 36 | float * *vMax; | |
| 37 | int vMin_fx; | |
| 38 | int vMin_fy; | |
| 39 | int vMid_fx; | |
| 40 | int vMid_fy; | |
| 41 | int vMax_fx; | |
| 42 | int vMax_fy; | |
| 43 | SWspan span; | |
| 44 | int fy0 = v0[0][1]; | |
| 45 | int fy1 = v1[0][1]; | |
| 46 | int fy2 = v2[0][1]; | |
| 47 | if (fy1 <= fy2) { | |
| 48 | vMin = v0; | |
| 49 | vMax = v1; | |
| 50 | vMin_fy = fy0; | |
| 51 | } | |
| 52 | vMin_fx = vMin[0][0]; | |
| 53 | vMid_fx = (int) | |
| 54 | (vMid[4][0] ? | |
| 55 | ((vMid[4][0] * (float)2048) + 0.5F) : | |
| 56 | ((vMid[4][0] * (float)2048) - 0.5F)); | |
| 57 | eMaj.dx = (vMax_fx - vMin_fx) * (1.0F / (float)2048); | |
| 58 | eMaj.dy = (vMax_fy - vMin_fy) * (1.0F / (float)2048); | |
| 59 | eTop.dx = (vMax_fx - vMid_fx) * (1.0F / (float)2048); | |
| 60 | eBot.dy = (vMid_fy - vMin_fy) * (1.0F / (float)2048); | |
| 61 | float area = eMaj.dx * eBot.dy - eBot.dx * eMaj.dy; | |
| 62 | if (IS_INF_OR_NAN(area)) | |
| 63 | return; | |
| 64 | oneOverArea = 1.0F / area; | |
| 65 | eBot.fx0 = vMin_fx; | |
| 66 | int scan_from_left_to_right; | |
| 67 | void (*PutRowRGB)(); | |
| 68 | char *texture; | |
| 69 | float eMaj_ds = (vMax[4][0] - vMin[4][0]); | |
| 70 | float eBot_ds; | |
| 71 | span.attrStepX[4][0] = | |
| 72 | oneOverArea * (eMaj_ds * eBot.dy - eMaj.dy * eBot_ds); | |
| 73 | span.intTexStep[0] = | |
| 74 | (int) | |
| 75 | ((span.attrStepX[4][0] >= | |
| 76 | 0.0F) ? span.attrStepX[4][0] : | |
| 77 | (span.attrStepX[4][0] * (float)2048) - 0.5F); | |
| 78 | int subTriangle; | |
| 79 | int fxRightEdge = 0; | |
| 80 | for (subTriangle = 0; subTriangle <= 1; subTriangle++) { | |
| 81 | EdgeT *eRight; | |
| 82 | int lines; | |
| 83 | if (subTriangle == 0) { | |
| 84 | if (scan_from_left_to_right) { | |
| 85 | eRight = &eBot; | |
| 86 | lines = eRight->lines; | |
| 87 | } else { | |
| 88 | eRight = &eMaj; | |
| 89 | } | |
| 90 | } else { | |
| 91 | if (scan_from_left_to_right) { | |
| 92 | eRight = &eTop; | |
| 93 | } | |
| 94 | fxRightEdge = eRight->fsx; | |
| 95 | } | |
| 96 | while (lines > 0) { | |
| 97 | span.x = 0; | |
| 98 | if (fxRightEdge <= span.x) | |
| 99 | span.end = 0; | |
| 100 | else | |
| 101 | span.end = fxRightEdge - span.x; | |
| 102 | span.intTex[0] = 0; | |
| 103 | if (span.end > 0 && span.y >= 0) { | |
| 104 | int i; | |
| 105 | char *rgb; | |
| 106 | for (i = 0; i < span.end; i++) { | |
| 107 | rgb[i] = texture[span.intTex[0]]; | |
| 108 | span.intTex[0] += span.intTexStep[0]; | |
| 109 | } | |
| 110 | PutRowRGB(rgb); | |
| 111 | } | |
| 112 | } | |
| 113 | } | |
| 114 | } | |
| 115 | ||
| 116 | void *foo() | |
| 117 | { | |
| 118 | return simple_textured_triangle; | |
| 119 | } |