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109
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1 #include "SDL.h"
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2 #include "polygon.h"
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3 #include "viewer.h"
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4 #include "SpanPack.h"
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5
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6 #define YTOP(y) (y & ~(TEXTURE_SPLIT_PIXEL-1))
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7 #define YOFF(y) (y & (TEXTURE_SPLIT_PIXEL-1))
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8
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9 #define FRAMEBUFFER_X Viewer::width
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10 #define FRAMEBUFFER_Y Viewer::height
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11 #define IMG_MAX_X Viewer::width
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12
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13 int *linebuf;
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14 float *zRow;
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15
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16 static char *
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17 get_pixel(int tx, int ty, void *texture_image)
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18 {
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19 return (char*)texture_image+(3*((128)*ty+tx));
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20 }
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21
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22 static void
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23 linebuf_init(int rgb)
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24 {
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25 int y = TEXTURE_SPLIT_PIXEL;
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26 int x = Viewer::width;
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27
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28 linebuf = (int*)malloc(sizeof(int)*x*y);
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29 memset(linebuf, rgb, sizeof(int)*x*y);
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30 }
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31
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32 static void
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33 zRow_init(void)
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34 {
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35 int y = TEXTURE_SPLIT_PIXEL;
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36 int x = Viewer::width;
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37 float z = 65535.0f;
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38 int length = x*y;
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39
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40 zRow = (float*)malloc(sizeof(float)*length);
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41
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42 for (int i = 0; i < length; i++) {
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43 zRow[i] = z;
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44 }
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45 }
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46
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47 static Uint32
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48 get_rgb(int tx, int ty, SDL_Surface *texture_image)
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49 {
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50 Uint8 red, green, blue, alpha;
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51
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52 if (tx<0) tx = 0;
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53 if (texture_image->w-1< tx) tx = texture_image->w-1 ;
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54 if (ty<0) ty = 0;
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55 if (texture_image->h-1< ty) ty = texture_image->h-1 ;
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56
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57 char *p = get_pixel(tx,ty,texture_image->pixels);
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58 blue = (Uint8) p[0];
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59 green = (Uint8) p[1];
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60 red = (Uint8) p[2];
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61 alpha = 255;
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62
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63
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64 return (red & 0xff) * 0x10000 + (green & 0xff) * 0x100
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65 + (blue & 0xff) + (alpha << 24);
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66 }
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67
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68 static void
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69 write_buffer(unsigned int fbdev_addr, int y)
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70 {
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71 int end_y;
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72 int start_y;
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73
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321
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74 // 画面上の領域に描き込まないように
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75 // ・・・なんか変だな。
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76 // とりあえず if 文どうにかしようぜ俺
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109
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77 if (y < 0) {
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78 if (y + TEXTURE_SPLIT_PIXEL < 0) {
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79 return;
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80 } else {
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81 start_y = -y;
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82 }
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83 } else {
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84 start_y = 0;
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85 }
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86
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321
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87 // 画面下の領域に書き込まないように
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88 // ってことは start_y も必要か。
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109
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89 end_y = FRAMEBUFFER_Y - y + TEXTURE_SPLIT_PIXEL;
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90 end_y = (end_y < 0) ? TEXTURE_SPLIT_PIXEL + end_y : TEXTURE_SPLIT_PIXEL;
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91
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321
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92 // 本家 write_pixel では、 y を y = height -y にしている。
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93 // こうすると、画面的に、 y++ すると 上に進むようになる。
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94 // でも、framebuffer は上から下で y++ になるから、混乱しそう
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109
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95 for (int i = start_y; i < end_y; i++) {
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96 memcpy((void*)(fbdev_addr + (4*FRAMEBUFFER_X*(y+i))),
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97 &linebuf[i*IMG_MAX_X], sizeof(int)*IMG_MAX_X);
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98 }
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99 }
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100
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101
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102 int
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103 span_pack_draw(SpanPack *sp, unsigned int fbdev_addr)
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104 {
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105 SpanPack *spack = sp;
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106 SpanPack *next_spack;
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107 Span *span;
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108
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109 zRow = NULL;
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110
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111 int render_y = 0;
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112 int linebuf_rgb;
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113
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114 render_y = sp->span[0].y;
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115 render_y = YTOP(render_y);
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116 //render_y += Viewer::height/2;
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117
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118 if (sp->info.size < 0) {
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119 linebuf_rgb = 0xffffff;
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120 linebuf_init(linebuf_rgb);
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121 goto WRITE;
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122 } else {
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123 linebuf_rgb = 0x000000;
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124 linebuf_init(linebuf_rgb);
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125 }
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126 zRow_init();
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127
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128 do {
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321
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129 // 次の pack があれば
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130 // 現在の pack の処理をしている間に
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131 // DMA でロードしておく。入るかな・・・
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109
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132 if (spack->next != NULL) {
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321
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133 // Cell ではこんな感じ？
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109
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134 // dma_load(next_spack, spack->next, sizeof(SpanPack));
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135 next_spack = spack->next;
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136 } else {
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137 next_spack = NULL;
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138 }
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139
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140 for (int n = 0; n < spack->info.size; n++) {
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141 span = &spack->span[n];
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142
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143 //int x = span->x + Viewer::width/2;
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144 //int y = span->y + Viewer::height/2;
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145 int x = span->x;
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146 int y = span->y;
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147 float z = span->start_z;
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148 int end = span->length_x;
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149 float zpos = span->end_z;
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150 float tex1 = span->tex_x1;
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151 float tex2 = span->tex_x2;
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152 float tey1 = span->tex_y1;
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153 float tey2 = span->tex_y2;
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154 Uint32 rgb;
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155 int tex_xpos;
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156 int tex_ypos;
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157 int tex_zpos;
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158 float tex_x, tex_y, tex_z;
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159
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160 if (end == 1) {
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161 tex_xpos = (int)((span->tex_height-1) * tex1);
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162 tex_ypos = (int)((span->tex_width-1) * tey1);
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163 tex_zpos = (int)z;
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164
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165 if (zpos < zRow[x + (Viewer::width * YOFF(y))]) {
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166 rgb = get_rgb(tex_xpos, tex_ypos, Polygon::texture_image);
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167 zRow[x + (Viewer::width * YOFF(y))] = zpos;
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168 linebuf[x + (Viewer::width * YOFF(y))] = rgb;
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169 }
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170 } else {
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171 for (int j = 0; j < end; j++) {
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172 tex_x = tex1*(end-1-j)/(end-1) + tex2*j/(end-1);
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173 tex_y = tey1*(end-1-j)/(end-1) + tey2*j/(end-1);
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174 tex_z = z*(end-1-j)/(end-1) + zpos*j/(end-1);
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175 if (tex_x > 1) tex_x = 1;
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176 if (tex_y > 1) tex_y = 1;
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177 tex_xpos = (int)((span->tex_height-1) * tex_x);
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178 tex_ypos = (int)((span->tex_width-1) * tex_y);
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179
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180 if (tex_z < zRow[x + j + (Viewer::width * YOFF(y))]) {
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181 rgb = get_rgb(tex_xpos, tex_ypos, Polygon::texture_image);
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182 zRow[x + j + (Viewer::width * YOFF(y))] = tex_z;
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183 linebuf[x + j + (Viewer::width * YOFF(y))] = rgb;
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184 }
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185 }
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186 }
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187 }
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188
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321
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189 // Cell ではこんな感じ？
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109
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190 // dma_wait(SPAN_PACK_LOAD);
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191 spack = next_spack;
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192 } while (spack);
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193
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194 WRITE:
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195 write_buffer(fbdev_addr, render_y);
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196
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197 if (zRow != NULL) free(zRow);
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198 free(linebuf);
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199
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200 return 0;
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201 }
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