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5098 | clevermous | 1 | #include |
2 | #include "zbuffer.h" |
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3 | |||
4 | #define ZCMP(z,zpix) ((z) >= (zpix)) |
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5 | |||
6 | void ZB_fillTriangleFlat(ZBuffer *zb, |
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7 | ZBufferPoint *p0,ZBufferPoint *p1,ZBufferPoint *p2) |
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8 | { |
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9 | #if TGL_FEATURE_RENDER_BITS == 24 |
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10 | unsigned char colorR, colorG, colorB; |
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11 | #else |
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12 | int color; |
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13 | #endif |
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14 | |||
15 | #define INTERP_Z |
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16 | |||
17 | #if TGL_FEATURE_RENDER_BITS == 24 |
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18 | |||
19 | #define DRAW_INIT() \ |
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20 | { \ |
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21 | colorR=p2->r>>8; \ |
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22 | colorG=p2->g>>8; \ |
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23 | colorB=p2->b>>8; \ |
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24 | } |
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25 | |||
26 | #define PUT_PIXEL(_a) \ |
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27 | { \ |
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28 | zz=z >> ZB_POINT_Z_FRAC_BITS; \ |
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29 | if (ZCMP(zz,pz[_a])) { \ |
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30 | pp[3 * _a]=colorR;\ |
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31 | pp[3 * _a + 1]=colorG;\ |
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32 | pp[3 * _a + 2]=colorB;\ |
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33 | pz[_a]=zz; \ |
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34 | }\ |
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35 | z+=dzdx; \ |
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36 | } |
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37 | |||
38 | #else |
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39 | |||
40 | #define DRAW_INIT() \ |
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41 | { \ |
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42 | color=RGB_TO_PIXEL(p2->r,p2->g,p2->b); \ |
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43 | } |
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44 | |||
45 | #define PUT_PIXEL(_a) \ |
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46 | { \ |
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47 | zz=z >> ZB_POINT_Z_FRAC_BITS; \ |
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48 | if (ZCMP(zz,pz[_a])) { \ |
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49 | pp[_a]=color; \ |
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50 | pz[_a]=zz; \ |
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51 | } \ |
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52 | z+=dzdx; \ |
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53 | } |
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54 | #endif /* TGL_FEATURE_RENDER_BITS == 24 */ |
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55 | |||
56 | #include "ztriangle.h" |
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57 | } |
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58 | |||
59 | /* |
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60 | * Smooth filled triangle. |
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61 | * The code below is very tricky :) |
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62 | */ |
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63 | |||
64 | void ZB_fillTriangleSmooth(ZBuffer *zb, |
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65 | ZBufferPoint *p0,ZBufferPoint *p1,ZBufferPoint *p2) |
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66 | { |
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67 | #if TGL_FEATURE_RENDER_BITS == 16 |
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68 | int _drgbdx; |
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69 | #endif |
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70 | |||
71 | #define INTERP_Z |
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72 | #define INTERP_RGB |
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73 | |||
74 | #define SAR_RND_TO_ZERO(v,n) (v / (1< |
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75 | |||
76 | #if TGL_FEATURE_RENDER_BITS == 24 |
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77 | |||
78 | #define DRAW_INIT() \ |
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79 | { \ |
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80 | } |
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81 | |||
82 | #define PUT_PIXEL(_a) \ |
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83 | { \ |
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84 | zz=z >> ZB_POINT_Z_FRAC_BITS; \ |
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85 | if (ZCMP(zz,pz[_a])) { \ |
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86 | pp[3 * _a]=or1 >> 8;\ |
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87 | pp[3 * _a + 1]=og1 >> 8;\ |
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88 | pp[3 * _a + 2]=ob1 >> 8;\ |
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89 | pz[_a]=zz; \ |
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90 | }\ |
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91 | z+=dzdx; \ |
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92 | og1+=dgdx; \ |
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93 | or1+=drdx; \ |
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94 | ob1+=dbdx; \ |
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95 | } |
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96 | |||
97 | #elif TGL_FEATURE_RENDER_BITS == 16 |
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98 | |||
99 | #define DRAW_INIT() \ |
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100 | { \ |
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101 | _drgbdx=(SAR_RND_TO_ZERO(drdx,6) << 22) & 0xFFC00000; \ |
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102 | _drgbdx|=SAR_RND_TO_ZERO(dgdx,5) & 0x000007FF; \ |
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103 | _drgbdx|=(SAR_RND_TO_ZERO(dbdx,7) << 12) & 0x001FF000; \ |
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104 | } |
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105 | |||
106 | |||
107 | #define PUT_PIXEL(_a) \ |
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108 | { \ |
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109 | zz=z >> ZB_POINT_Z_FRAC_BITS; \ |
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110 | if (ZCMP(zz,pz[_a])) { \ |
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111 | tmp=rgb & 0xF81F07E0; \ |
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112 | pp[_a]=tmp | (tmp >> 16); \ |
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113 | pz[_a]=zz; \ |
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114 | } \ |
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115 | z+=dzdx; \ |
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116 | rgb=(rgb+drgbdx) & ( ~ 0x00200800); \ |
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117 | } |
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118 | |||
119 | #define DRAW_LINE() \ |
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120 | { \ |
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121 | register unsigned short *pz; \ |
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122 | register PIXEL *pp; \ |
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123 | register unsigned int tmp,z,zz,rgb,drgbdx; \ |
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124 | register int n; \ |
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125 | n=(x2 >> 16) - x1; \ |
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126 | pp=pp1+x1; \ |
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127 | pz=pz1+x1; \ |
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128 | z=z1; \ |
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129 | rgb=(r1 << 16) & 0xFFC00000; \ |
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130 | rgb|=(g1 >> 5) & 0x000007FF; \ |
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131 | rgb|=(b1 << 5) & 0x001FF000; \ |
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132 | drgbdx=_drgbdx; \ |
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133 | while (n>=3) { \ |
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134 | PUT_PIXEL(0); \ |
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135 | PUT_PIXEL(1); \ |
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136 | PUT_PIXEL(2); \ |
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137 | PUT_PIXEL(3); \ |
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138 | pz+=4; \ |
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139 | pp+=4; \ |
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140 | n-=4; \ |
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141 | } \ |
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142 | while (n>=0) { \ |
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143 | PUT_PIXEL(0); \ |
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144 | pz+=1; \ |
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145 | pp+=1; \ |
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146 | n-=1; \ |
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147 | } \ |
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148 | } |
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149 | |||
150 | #else |
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151 | |||
152 | #define DRAW_INIT() \ |
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153 | { \ |
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154 | } |
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155 | |||
156 | #define PUT_PIXEL(_a) \ |
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157 | { \ |
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158 | zz=z >> ZB_POINT_Z_FRAC_BITS; \ |
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159 | if (ZCMP(zz,pz[_a])) { \ |
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160 | pp[_a] = RGB_TO_PIXEL(or1, og1, ob1);\ |
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161 | pz[_a]=zz; \ |
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162 | }\ |
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163 | z+=dzdx; \ |
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164 | og1+=dgdx; \ |
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165 | or1+=drdx; \ |
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166 | ob1+=dbdx; \ |
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167 | } |
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168 | |||
169 | #endif /* TGL_FEATURE_RENDER_BITS */ |
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170 | |||
171 | #include "ztriangle.h" |
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172 | } |
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173 | |||
174 | void ZB_setTexture(ZBuffer *zb,PIXEL *texture) |
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175 | { |
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176 | zb->current_texture=texture; |
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177 | } |
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178 | |||
179 | void ZB_fillTriangleMapping(ZBuffer *zb, |
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180 | ZBufferPoint *p0,ZBufferPoint *p1,ZBufferPoint *p2) |
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181 | { |
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182 | PIXEL *texture; |
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183 | |||
184 | #define INTERP_Z |
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185 | #define INTERP_ST |
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186 | |||
187 | #define DRAW_INIT() \ |
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188 | { \ |
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189 | texture=zb->current_texture; \ |
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190 | } |
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191 | |||
192 | #if TGL_FEATURE_RENDER_BITS == 24 |
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193 | |||
194 | #define PUT_PIXEL(_a) \ |
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195 | { \ |
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196 | unsigned char *ptr;\ |
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197 | zz=z >> ZB_POINT_Z_FRAC_BITS; \ |
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198 | if (ZCMP(zz,pz[_a])) { \ |
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199 | ptr = texture + (((t & 0x3FC00000) | s) >> 14) * 3; \ |
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200 | pp[3 * _a]= ptr[0];\ |
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201 | pp[3 * _a + 1]= ptr[1];\ |
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202 | pp[3 * _a + 2]= ptr[2];\ |
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203 | pz[_a]=zz; \ |
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204 | } \ |
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205 | z+=dzdx; \ |
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206 | s+=dsdx; \ |
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207 | t+=dtdx; \ |
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208 | } |
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209 | |||
210 | #else |
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211 | |||
212 | #define PUT_PIXEL(_a) \ |
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213 | { \ |
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214 | zz=z >> ZB_POINT_Z_FRAC_BITS; \ |
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215 | if (ZCMP(zz,pz[_a])) { \ |
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216 | pp[_a]=texture[((t & 0x3FC00000) | s) >> 14]; \ |
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217 | pz[_a]=zz; \ |
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218 | } \ |
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219 | z+=dzdx; \ |
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220 | s+=dsdx; \ |
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221 | t+=dtdx; \ |
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222 | } |
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223 | |||
224 | #endif |
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225 | |||
226 | #include "ztriangle.h" |
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227 | } |
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228 | |||
229 | /* |
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230 | * Texture mapping with perspective correction. |
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231 | * We use the gradient method to make less divisions. |
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232 | * TODO: pipeline the division |
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233 | */ |
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234 | #if 1 |
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235 | |||
236 | void ZB_fillTriangleMappingPerspective(ZBuffer *zb, |
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237 | ZBufferPoint *p0,ZBufferPoint *p1,ZBufferPoint *p2) |
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238 | { |
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239 | PIXEL *texture; |
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240 | float fdzdx,fndzdx,ndszdx,ndtzdx; |
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241 | |||
242 | #define INTERP_Z |
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243 | #define INTERP_STZ |
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244 | |||
245 | #define NB_INTERP 8 |
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246 | |||
247 | #define DRAW_INIT() \ |
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248 | { \ |
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249 | texture=zb->current_texture;\ |
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250 | fdzdx=(float)dzdx;\ |
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251 | fndzdx=NB_INTERP * fdzdx;\ |
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252 | ndszdx=NB_INTERP * dszdx;\ |
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253 | ndtzdx=NB_INTERP * dtzdx;\ |
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254 | } |
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255 | |||
256 | |||
257 | #if TGL_FEATURE_RENDER_BITS == 24 |
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258 | |||
259 | #define PUT_PIXEL(_a) \ |
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260 | { \ |
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261 | unsigned char *ptr;\ |
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262 | zz=z >> ZB_POINT_Z_FRAC_BITS; \ |
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263 | if (ZCMP(zz,pz[_a])) { \ |
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264 | ptr = texture + (((t & 0x3FC00000) | (s & 0x003FC000)) >> 14) * 3;\ |
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265 | pp[3 * _a]= ptr[0];\ |
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266 | pp[3 * _a + 1]= ptr[1];\ |
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267 | pp[3 * _a + 2]= ptr[2];\ |
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268 | pz[_a]=zz; \ |
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269 | } \ |
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270 | z+=dzdx; \ |
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271 | s+=dsdx; \ |
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272 | t+=dtdx; \ |
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273 | } |
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274 | |||
275 | #else |
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276 | |||
277 | #define PUT_PIXEL(_a) \ |
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278 | { \ |
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279 | zz=z >> ZB_POINT_Z_FRAC_BITS; \ |
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280 | if (ZCMP(zz,pz[_a])) { \ |
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281 | pp[_a]=*(PIXEL *)((char *)texture+ \ |
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282 | (((t & 0x3FC00000) | (s & 0x003FC000)) >> (17 - PSZSH)));\ |
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283 | pz[_a]=zz; \ |
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284 | } \ |
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285 | z+=dzdx; \ |
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286 | s+=dsdx; \ |
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287 | t+=dtdx; \ |
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288 | } |
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289 | |||
290 | #endif |
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291 | |||
292 | #define DRAW_LINE() \ |
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293 | { \ |
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294 | register unsigned short *pz; \ |
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295 | register PIXEL *pp; \ |
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296 | register unsigned int s,t,z,zz; \ |
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297 | register int n,dsdx,dtdx; \ |
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298 | float sz,tz,fz,zinv; \ |
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299 | n=(x2>>16)-x1; \ |
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300 | fz=(float)z1;\ |
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301 | zinv=1.0 / fz;\ |
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302 | pp=(PIXEL *)((char *)pp1 + x1 * PSZB); \ |
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303 | pz=pz1+x1; \ |
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304 | z=z1; \ |
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305 | sz=sz1;\ |
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306 | tz=tz1;\ |
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307 | while (n>=(NB_INTERP-1)) { \ |
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308 | {\ |
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309 | float ss,tt;\ |
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310 | ss=(sz * zinv);\ |
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311 | tt=(tz * zinv);\ |
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312 | s=(int) ss;\ |
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313 | t=(int) tt;\ |
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314 | dsdx= (int)( (dszdx - ss*fdzdx)*zinv );\ |
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315 | dtdx= (int)( (dtzdx - tt*fdzdx)*zinv );\ |
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316 | fz+=fndzdx;\ |
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317 | zinv=1.0 / fz;\ |
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318 | }\ |
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319 | PUT_PIXEL(0); \ |
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320 | PUT_PIXEL(1); \ |
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321 | PUT_PIXEL(2); \ |
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322 | PUT_PIXEL(3); \ |
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323 | PUT_PIXEL(4); \ |
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324 | PUT_PIXEL(5); \ |
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325 | PUT_PIXEL(6); \ |
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326 | PUT_PIXEL(7); \ |
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327 | pz+=NB_INTERP; \ |
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328 | pp=(PIXEL *)((char *)pp + NB_INTERP * PSZB);\ |
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329 | n-=NB_INTERP; \ |
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330 | sz+=ndszdx;\ |
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331 | tz+=ndtzdx;\ |
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332 | } \ |
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333 | {\ |
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334 | float ss,tt;\ |
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335 | ss=(sz * zinv);\ |
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336 | tt=(tz * zinv);\ |
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337 | s=(int) ss;\ |
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338 | t=(int) tt;\ |
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339 | dsdx= (int)( (dszdx - ss*fdzdx)*zinv );\ |
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340 | dtdx= (int)( (dtzdx - tt*fdzdx)*zinv );\ |
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341 | }\ |
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342 | while (n>=0) { \ |
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343 | PUT_PIXEL(0); \ |
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344 | pz+=1; \ |
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345 | pp=(PIXEL *)((char *)pp + PSZB);\ |
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346 | n-=1; \ |
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347 | } \ |
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348 | } |
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349 | |||
350 | #include "ztriangle.h" |
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351 | } |
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352 | |||
353 | #endif |
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354 | |||
355 | #if 0 |
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356 | |||
357 | /* slow but exact version (only there for reference, incorrect for 24 |
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358 | bits) */ |
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359 | |||
360 | void ZB_fillTriangleMappingPerspective(ZBuffer *zb, |
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361 | ZBufferPoint *p0,ZBufferPoint *p1,ZBufferPoint *p2) |
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362 | { |
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363 | PIXEL *texture; |
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364 | |||
365 | #define INTERP_Z |
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366 | #define INTERP_STZ |
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367 | |||
368 | #define DRAW_INIT() \ |
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369 | { \ |
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370 | texture=zb->current_texture; \ |
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371 | } |
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372 | |||
373 | #define PUT_PIXEL(_a) \ |
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374 | { \ |
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375 | float zinv; \ |
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376 | int s,t; \ |
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377 | zz=z >> ZB_POINT_Z_FRAC_BITS; \ |
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378 | if (ZCMP(zz,pz[_a])) { \ |
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379 | zinv= 1.0 / (float) z; \ |
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380 | s= (int) (sz * zinv); \ |
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381 | t= (int) (tz * zinv); \ |
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382 | pp[_a]=texture[((t & 0x3FC00000) | s) >> 14]; \ |
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383 | pz[_a]=zz; \ |
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384 | } \ |
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385 | z+=dzdx; \ |
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386 | sz+=dszdx; \ |
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387 | tz+=dtzdx; \ |
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388 | } |
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389 | |||
390 | #include "ztriangle.h" |
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391 | } |
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392 | |||
393 | |||
394 | #endif><>><>><>><> |