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comparison old/simple_render/task/span_pack_draw.cpp @ 507:735f76483bb2

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Reorganization..
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 12 Oct 2009 09:39:35 +0900
parents TaskManager/Test/simple_render/task/span_pack_draw.cpp@f64d75473f95
children
comparison
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506:1d4a8a86f26b 507:735f76483bb2
1 #include "SDL.h"
2 #include "polygon.h"
3 #include "viewer.h"
4 #include "SpanPack.h"
5
6 #define YTOP(y) (y & ~(TEXTURE_SPLIT_PIXEL-1))
7 #define YOFF(y) (y & (TEXTURE_SPLIT_PIXEL-1))
8
9 #define FRAMEBUFFER_X Viewer::width
10 #define FRAMEBUFFER_Y Viewer::height
11 #define IMG_MAX_X Viewer::width
12
13 int *linebuf;
14 float *zRow;
15
16 static char *
17 get_pixel(int tx, int ty, void *texture_image)
18 {
19 return (char*)texture_image+(3*((128)*ty+tx));
20 }
21
22 static void
23 linebuf_init(int rgb)
24 {
25 int y = TEXTURE_SPLIT_PIXEL;
26 int x = Viewer::width;
27
28 linebuf = (int*)malloc(sizeof(int)*x*y);
29 memset(linebuf, rgb, sizeof(int)*x*y);
30 }
31
32 static void
33 zRow_init(void)
34 {
35 int y = TEXTURE_SPLIT_PIXEL;
36 int x = Viewer::width;
37 float z = 65535.0f;
38 int length = x*y;
39
40 zRow = (float*)malloc(sizeof(float)*length);
41
42 for (int i = 0; i < length; i++) {
43 zRow[i] = z;
44 }
45 }
46
47 static Uint32
48 get_rgb(int tx, int ty, SDL_Surface *texture_image)
49 {
50 Uint8 red, green, blue, alpha;
51
52 if (tx<0) tx = 0;
53 if (texture_image->w-1< tx) tx = texture_image->w-1 ;
54 if (ty<0) ty = 0;
55 if (texture_image->h-1< ty) ty = texture_image->h-1 ;
56
57 char *p = get_pixel(tx,ty,texture_image->pixels);
58 blue = (Uint8) p[0];
59 green = (Uint8) p[1];
60 red = (Uint8) p[2];
61 alpha = 255;
62
63
64 return (red & 0xff) * 0x10000 + (green & 0xff) * 0x100
65 + (blue & 0xff) + (alpha << 24);
66 }
67
68 static void
69 write_buffer(unsigned int fbdev_addr, int y)
70 {
71 int end_y;
72 int start_y;
73
74 // 画面上の領域に描き込まないように
75 // ・・・なんか変だな。
76 // とりあえず if 文どうにかしようぜ俺
77 if (y < 0) {
78 if (y + TEXTURE_SPLIT_PIXEL < 0) {
79 return;
80 } else {
81 start_y = -y;
82 }
83 } else {
84 start_y = 0;
85 }
86
87 // 画面下の領域に書き込まないように
88 // ってことは start_y も必要か。
89 end_y = FRAMEBUFFER_Y - y + TEXTURE_SPLIT_PIXEL;
90 end_y = (end_y < 0) ? TEXTURE_SPLIT_PIXEL + end_y : TEXTURE_SPLIT_PIXEL;
91
92 // 本家 write_pixel では、 y を y = height -y にしている。
93 // こうすると、画面的に、 y++ すると 上に進むようになる。
94 // でも、framebuffer は上から下で y++ になるから、混乱しそう
95 for (int i = start_y; i < end_y; i++) {
96 memcpy((void*)(fbdev_addr + (4*FRAMEBUFFER_X*(y+i))),
97 &linebuf[i*IMG_MAX_X], sizeof(int)*IMG_MAX_X);
98 }
99 }
100
101
102 int
103 span_pack_draw(SpanPack *sp, unsigned int fbdev_addr)
104 {
105 SpanPack *spack = sp;
106 SpanPack *next_spack;
107 Span *span;
108
109 zRow = NULL;
110
111 int render_y = 0;
112 int linebuf_rgb;
113
114 render_y = sp->span[0].y;
115 render_y = YTOP(render_y);
116 //render_y += Viewer::height/2;
117
118 if (sp->info.size < 0) {
119 linebuf_rgb = 0xffffff;
120 linebuf_init(linebuf_rgb);
121 goto WRITE;
122 } else {
123 linebuf_rgb = 0x000000;
124 linebuf_init(linebuf_rgb);
125 }
126 zRow_init();
127
128 do {
129 // 次の pack があれば
130 // 現在の pack の処理をしている間に
131 // DMA でロードしておく。入るかな・・・
132 if (spack->next != NULL) {
133 // Cell ではこんな感じ？
134 // dma_load(next_spack, spack->next, sizeof(SpanPack));
135 next_spack = spack->next;
136 } else {
137 next_spack = NULL;
138 }
139
140 for (int n = 0; n < spack->info.size; n++) {
141 span = &spack->span[n];
142
143 //int x = span->x + Viewer::width/2;
144 //int y = span->y + Viewer::height/2;
145 int x = span->x;
146 int y = span->y;
147 float z = span->start_z;
148 int end = span->length_x;
149 float zpos = span->end_z;
150 float tex1 = span->tex_x1;
151 float tex2 = span->tex_x2;
152 float tey1 = span->tex_y1;
153 float tey2 = span->tex_y2;
154 Uint32 rgb;
155 int tex_xpos;
156 int tex_ypos;
157 int tex_zpos;
158 float tex_x, tex_y, tex_z;
159
160 if (end == 1) {
161 tex_xpos = (int)((span->tex_height-1) * tex1);
162 tex_ypos = (int)((span->tex_width-1) * tey1);
163 tex_zpos = (int)z;
164
165 if (zpos < zRow[x + (Viewer::width * YOFF(y))]) {
166 rgb = get_rgb(tex_xpos, tex_ypos, Polygon::texture_image);
167 zRow[x + (Viewer::width * YOFF(y))] = zpos;
168 linebuf[x + (Viewer::width * YOFF(y))] = rgb;
169 }
170 } else {
171 for (int j = 0; j < end; j++) {
172 tex_x = tex1*(end-1-j)/(end-1) + tex2*j/(end-1);
173 tex_y = tey1*(end-1-j)/(end-1) + tey2*j/(end-1);
174 tex_z = z*(end-1-j)/(end-1) + zpos*j/(end-1);
175 if (tex_x > 1) tex_x = 1;
176 if (tex_y > 1) tex_y = 1;
177 tex_xpos = (int)((span->tex_height-1) * tex_x);
178 tex_ypos = (int)((span->tex_width-1) * tex_y);
179
180 if (tex_z < zRow[x + j + (Viewer::width * YOFF(y))]) {
181 rgb = get_rgb(tex_xpos, tex_ypos, Polygon::texture_image);
182 zRow[x + j + (Viewer::width * YOFF(y))] = tex_z;
183 linebuf[x + j + (Viewer::width * YOFF(y))] = rgb;
184 }
185 }
186 }
187 }
188
189 // Cell ではこんな感じ？
190 // dma_wait(SPAN_PACK_LOAD);
191 spack = next_spack;
192 } while (spack);
193
194 WRITE:
195 write_buffer(fbdev_addr, render_y);
196
197 if (zRow != NULL) free(zRow);
198 free(linebuf);
199
200 return 0;
201 }