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53
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1 #include <iostream>
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2 #include "span.h"
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3 #include "triangle.h"
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4 #include "polygon.h"
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5 using namespace std;
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6
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7
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321
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8 // f1:xの増加量 f2:yの増加量 i:....... base:基本となる頂点のy座標
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53
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9 static float calc(float f1, float f2,int i, float base){
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10 float ans;
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11 ans = f1/f2*i + base;
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12 return ans;
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13 }
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14
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15
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16 static Vertex *vMid1(Vertex *vMid1,Vertex *vMin, Vertex *vMid, Vertex *vMax) {
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17 float d,d1;
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18
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19 vMid1->y = vMid->y;
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20 //vMid1->tex_y = vMid->tex_y;
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21 d = (int)vMax->y-(int)vMin->y;
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22 d1 = (int)vMid->y - (int)vMin->y;
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23 /*
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24
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25 if (-1.0<=vMax->y&&vMax->y<=1.0) {
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26 a = 0.5;
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27 } else {
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28 a = (vMax->x-vMin->x)/d;
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29 }
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30 */
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31 //vMid1->tex_x = vMin->tex_x + a * (vMax->tex_x-vMin->tex_x);
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32 vMid1->tex_x = calc(vMax->tex_x - vMin->tex_x, d, (int)d1 , vMin->tex_x);
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33 vMid1->tex_y = calc(vMax->tex_y - vMin->tex_y, d, (int)d1 , vMin->tex_y);
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34 //vMid1->x = vMin->x + a * (vMax->y -vMin->y);
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35 vMid1->x = calc(vMax->x - vMin->x, d, (int)d1 , vMin->x);
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36 //vMid1->z = vMin->z + a * (vMax->y -vMin->y);
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37 vMid1->z = calc(vMax->z - vMin->z, d, (int)d1 , vMin->z);
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38 //printf("x:%f y:%f z:%f tex_x:%f tex_y:%f\n",vMid1->x,vMid1->y,vMid1->z,vMid1->tex_x, vMid1->tex_y);
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39 return vMid1;
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40 }
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41
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42
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43
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44 void
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68
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45 Span_c::half_triangle(Vertex *vMin, Vertex *vMid, Vertex *vMid1,
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53
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46 SDL_Surface *image)
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47 {
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48
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49 float tmp_z,tmp_tex1, tmp_tex2 ,tmp_tey1,tmp_tey2;
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50 //tmp_x,tmp_y,tmp_ypos ......unused
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51 float tex_x, tex_y,tex_z;
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52 float tmp_xpos,tmp_end,tmp_zpos;
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53 int tex_xpos,tex_ypos,tex_zpos;
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54 int i,j;
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55 float div_y;
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56 Uint32 rgb;
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57 float z,zpos;
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58 int x,y;
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59 int k =0;
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60 int l = 1;
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61 //float incli_x1, incli_x2;
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62 //float incli_z1, incli_z2;
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63 //float base_x1, base_x2 , base_z1, base_z2;
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64 //int base_y;
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65
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66 /*
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67 incli_x1 = vMid1->x - vMin->x;
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68 incli_x2 = vMid->x - vMin->x;
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69 incli_z1 = vMid1->z - vMin->z;
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70 incli_z2 = vMid->z - vMin->z;
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71 base_x1 = vMin->x;
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72 base_x2 = vMin->x;
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73 base_z1 = vMin->z;
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74 base_z2 = vMin->z;
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75 */
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76 //cout << vMin->x << vMin->y << vMin->z << endl;
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77 int start_y = (int)vMid->y;
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78 int end_y = (int)vMin->y;
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79
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80 if (start_y<end_y) {
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321
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81 int i; i=end_y; end_y=start_y; start_y = i; //yの入れ替え
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53
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82 //Vertex *v; v = vMin; vMin = vMid; vMid = v;
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83 /*
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84 incli_x1 = vMin->x - vMid->x; incli_x2 = vMin->x - vMid1->x;
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85 incli_z1 = vMin->z - vMid->z; incli_z2 = vMin->z - vMid1->z;
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86 base_z1 = vMid->z; base_z2 = vMid1->z;
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87 base_y = (int)vMid->y;
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88 */
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89 k = 1;
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90 l = -1;
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91 }
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92
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93
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94
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95 div_y = start_y - end_y; // > 0
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96
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97 //if(div_y < 1 && div_y > -1) div_y = 1;
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98 for(i = k; i < div_y+1; i++) {
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321
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99 //ここでspanの左端と右端のx,zを求めてる
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53
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100 tmp_xpos = calc(vMid1->x - vMin->x ,div_y, i, vMin->x);
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101 tmp_end = calc(vMid->x - vMin->x ,div_y, i, vMin->x);
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102 tmp_z = calc(vMid1->z - vMin->z ,div_y, i, vMin->z);
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103 tmp_zpos = calc(vMid->z - vMin->z ,div_y, i, vMin->z);
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104 //printf("x:%f end:%f z:%f zpos:%f\n",tmp_xpos,tmp_end,tmp_z,tmp_zpos);
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321
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105 //ここからspanの左端と右端に対応するテクスチャを計算する
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53
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106 tmp_tex1 =((i/(div_y)) * vMid1->tex_x) + \
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107 ( ((div_y - i)/(div_y)) * vMin->tex_x);
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108 tmp_tex2 =( (i/(div_y)) * vMid->tex_x) + \
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109 ( ((div_y - i)/(div_y)) * vMin->tex_x);
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110
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111 tmp_tey1 =( (i/(div_y)) * vMid1->tex_y) + \
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112 ( ((div_y - i)/(div_y)) * vMin->tex_y);
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113 tmp_tey2 =( (i/(div_y)) * vMid->tex_y) + \
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114 ( ((div_y - i)/(div_y)) * vMin->tex_y);
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115
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321
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116 //ここで左端がxposかendを判断し、描画するspanを作る
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53
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117 if(tmp_xpos > tmp_end) {
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118 x = (int)tmp_end;
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119 y = (int)vMin->y + i*l;
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120 end = (int)(tmp_xpos)-(int)(tmp_end)+1;
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121 z = tmp_zpos;
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122 zpos = tmp_z;
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123 tex1 = tmp_tex2;
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124 tex2 = tmp_tex1;
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125 tey1 = tmp_tey2;
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126 tey2 = tmp_tey1;
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127 } else {
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128 x = (int)tmp_xpos;
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129 y = (int)vMin->y + i*l;
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130 end = (int)(tmp_end)-(int)(tmp_xpos)+1;
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131 z = tmp_z;
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132 zpos = tmp_zpos;
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133 tex1 = tmp_tex1;
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134 tex2 = tmp_tex2;
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135 tey1 = tmp_tey1;
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136 tey2 = tmp_tey2;
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137 }
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138 //printf("%d:%f,%f ",(int)vMin->y + i,xpos,end);
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139 //printf("%d:%d:%d:x:%d,end:%d\n",x, y , end,(int)(tmp_end),(int)(tmp_xpos));
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140 //printf("x:%d y:%d end:%d z:%f zpos:%f\n",x,y,end,z , zpos);
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141 //printf("tex1:%f tex2:%f tey1:%f tey2:%f\n",tex1,tex2,tey1,tey2);
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142 if(end == 1) {
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143 //printf("tex_x:%f tex_y:%f\n",tex1,tex2);
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144 if(tex1 > 1) tex1 = 1;
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145 if(tey1 > 1) tey1 = 1;
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146 tex_xpos = (int)((image->h-1) * tex1);
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147 tex_ypos = (int)((image->w-1) * tey1);
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148 tex_zpos = (int)z;
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149 //printf("tex_xpos:%d tex_ypos:%d\n",tex_xpos,tex_ypos);
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150 //printf("image->h:%d tex_x:%f\n",image->h,tex1);
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151 rgb = p->get_rgb(tex_xpos,tex_ypos);
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152 viewer->write_pixel(x,y,zpos,rgb);
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153 }else {
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154 for(j = 0; j < end; j++) {
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155 tex_x = tex1*(end-1-j)/(end-1) + tex2*j/(end-1);
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156 tex_y = tey1*(end-1-j)/(end-1) + tey2*j/(end-1);
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157 tex_z = z*(end-1-j)/(end-1) + zpos*j/(end-1);
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158 if(tex_x > 1) tex_x = 1;
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159 if(tex_y > 1) tex_y = 1;
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160 tex_xpos = (int)((image->h-1) * tex_x);
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161 tex_ypos = (int)((image->w-1) * tex_y);
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162 //printf("tex_xpos:%d tex_ypos:%d\n",tex_xpos,tex_ypos);
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163 //printf("z:%f zpos:%f tex_z:%f\n",z,zpos,tex_z);
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164 //printf("tex_x:%f tex_y:%f\n",tex_x,tex_y);
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165 rgb = p->get_rgb(tex_xpos,tex_ypos);
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166 viewer->write_pixel(j+x,y,tex_z,rgb);
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167 }
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168 }
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169 }
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170 }
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171
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68
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172 void Span_c::create_span(Triangle *tri,SDL_Surface *image) {
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53
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173 Vertex *vMin , *vMid, *vMax;
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174 /*
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175 float tmp_z,tmp_tex1, tmp_tex2 ,tmp_tey1,tmp_tey2;
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176 //tmp_x,tmp_y,tmp_ypos ......unused
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177 float tex_x, tex_y,tex_z;
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178 float tmp_xpos,tmp_end,tmp_zpos;
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179 int top_triangle;
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180 int tex_xpos,tex_ypos,tex_zpos;
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181 int i,j;
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182 float div_x,div_y;
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183 float z,zpos;
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184 Uint32 rgb;
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185 */
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186
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187 //cout << "x = " << tri->vertex1->x << endl;
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188 if(tri->vertex1->y <= tri->vertex2->y) {
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189 if(tri->vertex2->y <= tri->vertex3->y) {
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190 //printf("condition 1\n");
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191 vMin = tri->vertex1;
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192 vMid = tri->vertex2;
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193 vMax = tri->vertex3;
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194 } else if(tri->vertex3->y <= tri->vertex1->y) {
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195 //printf("condition 2\n");
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196 vMin = tri->vertex3;
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197 vMid = tri->vertex1;
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198 vMax = tri->vertex2;
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199 } else {
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200 //printf("condition 3\n");
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201 vMin = tri->vertex1;
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202 vMid = tri->vertex3;
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203 vMax = tri->vertex2;
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204 }
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205 } else {
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206 if(tri->vertex1->y <= tri->vertex3->y) {
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207 //printf("condition 4\n");
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208 vMin = tri->vertex2;
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209 vMid = tri->vertex1;
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210 vMax = tri->vertex3;
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211 } else if(tri->vertex3->y <= tri->vertex2->y) {
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212 //printf("condition 5\n");
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213 vMin = tri->vertex3;
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214 vMid = tri->vertex2;
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215 vMax = tri->vertex1;
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216 } else {
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217 //printf("condition 6\n");
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218 vMin = tri->vertex2;
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219 vMid = tri->vertex3;
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220 vMax = tri->vertex1;
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221 }
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222 }
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223
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224 Vertex *vMid10 = new Vertex(0,0,0,0,0);
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225 vMid1(vMid10,vMin,vMid,vMax);
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226
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227 half_triangle(vMin,vMid,vMid10,image);
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228 half_triangle(vMax,vMid,vMid10,image);
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229
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230 free(vMid10);
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231 #if 0
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232 //cout << vMin->x << vMin->y << vMin->z << endl;
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233 div_x = (int)vMid->y - (int)vMin->y;
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234 if(div_x < 1 && div_x > -1) div_x = 1;
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235 div_y = (int)vMax->y - (int)vMin->y;
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236 if(div_y < 1 && div_y > -1) div_y = 1;
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237
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238 for(i = 0; i < div_x+1; i++) {
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321
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239 //ここでspanの左端と右端のx,zを求めてる
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53
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240 tmp_xpos = calc(vMax->x - vMin->x,div_y, i, vMin->x);
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241 tmp_end = calc(vMid->x - vMin->x,div_x, i, vMin->x);
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242 tmp_z = calc(vMax->z - vMin->z,div_y, i, vMin->z);
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243 tmp_zpos = calc(vMid->z - vMin->z,div_x, i, vMin->z);
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244
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321
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245 //ここからspanの左端と右端に対応するテクスチャを計算する
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53
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246 tmp_tex1 =( (i/(div_y)) * vMax->tex_x) + \
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247 ( ((div_y - i)/(div_y)) * vMin->tex_x);
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248 tmp_tex2 =( (i/(div_x)) * vMid->tex_x) + \
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249 ( ((div_x - i)/(div_x)) * vMin->tex_x);
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250
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251 tmp_tey1 =( (i/(div_y)) * vMax->tex_y) + \
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252 ( ((div_y - i)/(div_y)) * vMin->tex_y);
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253 tmp_tey2 =( (i/(div_x)) * vMid->tex_y) + \
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254 ( ((div_x - i)/(div_x)) * vMin->tex_y);
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255
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321
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256 //ここで左端がxposかendを判断し、描画するspanを作る
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53
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257 if(tmp_xpos > tmp_end) {
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258 x = (int)tmp_end;
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259 y = (int)vMin->y + i;
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260 end = (int)(tmp_xpos)-(int)(tmp_end)+1;
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261 z = tmp_z;
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262 zpos = tmp_zpos;
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263 tex1 = tmp_tex2;
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264 tex2 = tmp_tex1;
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265 tey1 = tmp_tey2;
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266 tey2 = tmp_tey1;
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267 } else {
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268 x = (int)tmp_xpos;
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269 y = (int)vMin->y + i;
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270 end = (int)(tmp_end)-(int)(tmp_xpos)+1;
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271 z = tmp_zpos;
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272 zpos = tmp_z;
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273 tex1 = tmp_tex1;
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274 tex2 = tmp_tex2;
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275 tey1 = tmp_tey1;
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276 tey2 = tmp_tey2;
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277 }
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278 //printf("%d:%f,%f ",(int)vMin->y + i,xpos,end);
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279 //printf("%d:%d:%d:x:%d,end:%d\n",x, y , end,(int)(tmp_end),(int)(tmp_xpos));
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280 //printf("x:%d y:%d end:%d z:%f zpos:%f\n",x,y,end,z , zpos);
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281 //printf("tex1:%f tex2:%f tey1:%f tey2:%f\n",tex1,tex2,tey1,tey2);
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282 if(end == 1) {
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283 //printf("tex_x:%f tex_y:%f\n",tex1,tex2);
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284 if(tex1 > 1) tex1 = 1;
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285 if(tey1 > 1) tey1 = 1;
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286 tex_xpos = (int)(image->h-1) * tex1;
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287 tex_ypos = (int)(image->w-1) * tey1;
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288 tex_zpos = z;
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289 //printf("tex_xpos:%d tex_ypos:%d\n",tex_xpos,tex_ypos);
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290 //printf("image->h:%d tex_x:%f\n",image->h,tex1);
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291 rgb = p->get_rgb(tex_xpos,tex_ypos);
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292 viewer->write_pixel(x,y,zpos,rgb);
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293 }else {
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294 for(j = 0; j < end; j++) {
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295 tex_x = tex1*(end-1-j)/(end-1) + tex2*j/(end-1);
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296 tex_y = tey1*(end-1-j)/(end-1) + tey2*j/(end-1);
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297 tex_z = z*(end-1-j)/(end-1) + zpos*j/(end-1);
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298 if(tex_x > 1) tex_x = 1;
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299 if(tex_y > 1) tex_y = 1;
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300 tex_xpos = (int)(image->h-1) * tex_x;
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301 tex_ypos = (int)(image->w-1) * tex_y;
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302 //printf("tex_xpos:%d tex_ypos:%d\n",tex_xpos,tex_ypos);
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303 //printf("z:%f zpos:%f tex_z:%f\n",z,zpos,tex_z);
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304 //printf("tex_x:%f tex_y:%f\n",tex_x,tex_y);
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305 rgb = p->get_rgb(tex_xpos,tex_ypos);
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306 viewer->write_pixel(j+x,y,tex_z,rgb);
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307 }
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308 }
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309 }
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310
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311 top_triangle = (int)vMid->y - (int)vMin->y;
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312 div_x = (int)vMax->y - (int)vMid->y;
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313 if(div_x < 1 && div_x > -1) div_x = 1;
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314 div_y = (int)vMax->y - (int)vMin->y;
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315 if(div_y < 1 && div_y > -1) div_y = 1;
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316
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317 for(i = 0; i < div_x; i++) {
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321
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318 //ここでspanの左端と右端のx,zを求めてる
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53
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319 tmp_xpos = calc(vMax->x-vMin->x, div_y, (i+1+top_triangle), vMin->x);
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320 tmp_end = calc(vMax->x-vMid->x, div_x, (i+1), vMid->x);
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321 tmp_z = calc(vMax->z-vMin->z, div_y, (i+1+top_triangle), vMin->z);
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322 tmp_zpos = calc(vMax->z-vMid->z, div_x, (i+1), vMid->z);
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323
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324 tmp_tex1 =( ((i + 1 +top_triangle)/(div_y)) * vMax->tex_x) + \
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325 ( ((div_y - i - 1 - top_triangle)/(div_y)) * vMin->tex_x);
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326 tmp_tex2 =( ((i+1)/(div_x)) * vMax->tex_x) + \
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327 ( ((div_x - i -1)/(div_x)) * vMid->tex_x);
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328
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329 tmp_tey1 =( ((i+1+top_triangle)/(div_y)) * vMax->tex_y) + \
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330 ( ((div_y - i - 1 - top_triangle)/(div_y)) * vMin->tex_y);
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331 tmp_tey2 =( ((i+1)/(div_x)) * vMax->tex_y) + \
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332 ( ((div_x - i -1)/(div_x)) * vMid->tex_y);
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333 if(tmp_xpos > tmp_end) {
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334 x = (int)tmp_end;
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335 y = (int)vMid->y+i+1;
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336 end = (int)(tmp_xpos)-(int)(tmp_end)+1;
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337 z = tmp_z;
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338 zpos = tmp_zpos;
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339 tex1 = tmp_tex2;
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340 tex2 = tmp_tex1;
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341 tey1 = tmp_tey2;
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342 tey2 = tmp_tey1;
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343 } else {
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344 x = (int)tmp_xpos;
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345 y = (int)vMid->y+i+1;
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346 end = (int)(tmp_end)-(int)(tmp_xpos)+1;
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347 z = tmp_zpos;
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348 zpos = tmp_z;
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349 tex1 = tmp_tex1;
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350 tex2 = tmp_tex2;
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351 tey1 = tmp_tey1;
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352 tey2 = tmp_tey2;
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353 }
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354 if(end == 0) end = 1;
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355 //printf("%d:%d:%d\n",x, y , end);
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356 //printf("x:%d y:%d end:%d z:%f zpos:%f\n",x,y,end,z,zpos);
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357 //printf("tex1:%f tex2:%f tey1:%f tey2:%f\n",tex1,tex2,tey1,tey2);
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358 if(end == 1) {
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359 //printf("tex_x:%f tex_y:%f\n",tex1,tex2);
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360 if(tex1 > 1) tex1 = 1;
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361 if(tey1 > 1) tey1 = 1;
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362 tex_xpos = (int)(image->h-1) * tex1;
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363 tex_ypos = (int)(image->w-1) * tey1;
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364 tex_zpos = z;
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365 //printf("tex_x:%f tex_y:%f\n",tex_x,tex_y);
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366 //printf("tex_xpos:%d tex_ypos:%d\n",tex_xpos,tex_ypos);
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367 //printf("tex_x:%f tex_y:%f\n",tex_x,tex_y);
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368 rgb = p->get_rgb(tex_xpos,tex_ypos);
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369 viewer->write_pixel(x,y,tex_zpos,rgb);
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370 }else {
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371 for(j = 0; j < end; j++) {
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372 tex_x = tex1*(end-1-j)/(end-1) + tex2*j/(end-1);
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373 tex_y = tey1*(end-1-j)/(end-1) + tey2*j/(end-1);
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374 tex_z = z*(end-1-j)/(end-1) + zpos*j/(end-1);
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375 //printf("tex_x:%f tex_y:%f\n",tex_x,tex_y);
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376 if(tex_x > 1) tex_x = 1;
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377 if(tex_y > 1) tex_y = 1;
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378 tex_xpos = (int)(image->h-2) * tex_x;
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379 tex_ypos = (int)(image->w-1) * tex_y;
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380 //printf("z:%f zpos:%f tex_z:%f\n",z,zpos,tex_z);
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381 //printf("tex_xpos:%d tex_ypos:%d\n",tex_xpos,tex_ypos);
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382 //printf("tex_x:%f tex_y:%f\n",tex_x,tex_y);
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383 //printf("tex_x:%f tex_y:%f\n",tex_x,tex_y);
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384 rgb = p->get_rgb(tex_xpos,tex_ypos);
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385 viewer->write_pixel(j+x,y,tex_z,rgb);
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386 }
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387 }
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388 }
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389 #endif
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390 }
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391
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321
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392 // i:分子、f1:長さ f2:対応する頂点1 f3:対応する頂点2
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53
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393 /*
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394 float Span::calc2(int i, float f1, float f2, float f3) {
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395 float ans;
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396 ans = i/f1 * f2 + (f1-i)/f1 * f3;
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397
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398 */
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