--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TaskManager/Test/simple_render/task/span_pack_draw.cpp	Wed Nov 12 17:39:33 2008 +0900
@@ -0,0 +1,201 @@
+#include "SDL.h"
+#include "polygon.h"
+#include "viewer.h"
+#include "SpanPack.h"
+
+#define YTOP(y) (y & ~(TEXTURE_SPLIT_PIXEL-1))
+#define YOFF(y) (y & (TEXTURE_SPLIT_PIXEL-1))
+
+#define FRAMEBUFFER_X Viewer::width
+#define FRAMEBUFFER_Y Viewer::height
+#define IMG_MAX_X Viewer::width
+
+int *linebuf;
+float *zRow;
+
+static char *
+get_pixel(int tx, int ty, void *texture_image)
+{
+    return (char*)texture_image+(3*((128)*ty+tx));
+}
+
+static void
+linebuf_init(int rgb)
+{
+    int y = TEXTURE_SPLIT_PIXEL;
+    int x = Viewer::width;
+
+    linebuf = (int*)malloc(sizeof(int)*x*y);
+    memset(linebuf, rgb, sizeof(int)*x*y);
+}
+
+static void
+zRow_init(void)
+{
+    int y = TEXTURE_SPLIT_PIXEL;
+    int x = Viewer::width;
+    float z = 65535.0f;
+    int length = x*y;
+
+    zRow = (float*)malloc(sizeof(float)*length);
+
+    for (int i = 0; i < length; i++) {
+	zRow[i] = z;
+    }
+}
+
+static Uint32
+get_rgb(int tx, int ty, SDL_Surface *texture_image)
+{
+    Uint8 red, green, blue, alpha;
+
+    if (tx<0) tx = 0;
+    if (texture_image->w-1< tx) tx = texture_image->w-1 ;
+    if (ty<0) ty = 0;
+    if (texture_image->h-1< ty) ty = texture_image->h-1 ;
+
+    char *p = get_pixel(tx,ty,texture_image->pixels);
+    blue  = (Uint8) p[0];
+    green = (Uint8) p[1];
+    red   = (Uint8) p[2];
+    alpha = 255;
+
+    
+    return (red & 0xff) * 0x10000 + (green & 0xff) * 0x100 
+	+ (blue & 0xff) + (alpha << 24);
+}
+
+static void
+write_buffer(unsigned int fbdev_addr, int y)
+{
+    int end_y;
+    int start_y;
+
+    // 画面上の領域に描き込まないように
+    // ・・・なんか変だな。
+    // とりあえず if 文どうにかしようぜ俺
+    if (y < 0) {
+	if (y + TEXTURE_SPLIT_PIXEL < 0) {
+            return;
+        } else {
+            start_y = -y;
+	}
+    } else {
+        start_y = 0;
+    }
+
+    // 画面下の領域に書き込まないように
+    // ってことは start_y も必要か。
+    end_y = FRAMEBUFFER_Y - y + TEXTURE_SPLIT_PIXEL;
+    end_y = (end_y < 0) ? TEXTURE_SPLIT_PIXEL + end_y : TEXTURE_SPLIT_PIXEL;
+    
+    // 本家 write_pixel では、 y を y = height -y にしている。
+    // こうすると、画面的に、 y++ すると 上に進むようになる。
+    // でも、framebuffer は上から下で y++ になるから、混乱しそう
+    for (int i = start_y; i < end_y; i++) {
+	memcpy((void*)(fbdev_addr + (4*FRAMEBUFFER_X*(y+i))),
+	       &linebuf[i*IMG_MAX_X], sizeof(int)*IMG_MAX_X);
+    }
+}
+
+
+int
+span_pack_draw(SpanPack *sp, unsigned int fbdev_addr)
+{
+    SpanPack *spack = sp;
+    SpanPack *next_spack;
+    Span *span;
+
+    zRow = NULL;
+
+    int render_y = 0;
+    int linebuf_rgb;
+
+    render_y = sp->span[0].y;
+    render_y = YTOP(render_y);
+    //render_y += Viewer::height/2;
+
+    if (sp->info.size < 0) {
+	linebuf_rgb = 0xffffff;
+	linebuf_init(linebuf_rgb);
+	goto WRITE;
+    } else {
+	linebuf_rgb = 0x000000;
+	linebuf_init(linebuf_rgb);
+    }
+    zRow_init();
+
+    do {
+	// 次の pack があれば
+	// 現在の pack の処理をしている間に
+	// DMA でロードしておく。入るかな・・・
+	if (spack->next != NULL) {
+	    // Cell ではこんな感じ？
+	    // dma_load(next_spack, spack->next, sizeof(SpanPack));
+	    next_spack = spack->next;
+	} else {
+	    next_spack = NULL;
+	}
+
+	for (int n = 0; n < spack->info.size; n++) {
+	    span = &spack->span[n];
+
+	    //int x = span->x + Viewer::width/2;
+	    //int y = span->y + Viewer::height/2;
+	    int x = span->x;
+	    int y = span->y;
+	    float z = span->start_z;
+	    int end = span->length_x;
+	    float zpos = span->end_z;
+	    float tex1 = span->tex_x1;
+	    float tex2 = span->tex_x2;
+	    float tey1 = span->tex_y1;
+	    float tey2 = span->tex_y2;
+	    Uint32 rgb;
+	    int tex_xpos;
+	    int tex_ypos;
+	    int tex_zpos;
+	    float tex_x, tex_y, tex_z;
+
+	    if (end == 1) {
+		tex_xpos = (int)((span->tex_height-1) * tex1);
+		tex_ypos = (int)((span->tex_width-1) * tey1);
+		tex_zpos = (int)z;
+
+		if (zpos < zRow[x + (Viewer::width * YOFF(y))]) {
+		    rgb = get_rgb(tex_xpos, tex_ypos, Polygon::texture_image);
+		    zRow[x + (Viewer::width * YOFF(y))] = zpos;
+		    linebuf[x + (Viewer::width * YOFF(y))] = rgb;
+		}
+	    } else {
+		for (int j = 0; j < end; j++) {
+		    tex_x = tex1*(end-1-j)/(end-1) + tex2*j/(end-1);
+		    tex_y = tey1*(end-1-j)/(end-1) + tey2*j/(end-1);
+		    tex_z = z*(end-1-j)/(end-1) + zpos*j/(end-1);
+		    if (tex_x > 1) tex_x = 1;
+		    if (tex_y > 1) tex_y = 1;
+		    tex_xpos = (int)((span->tex_height-1) * tex_x);
+		    tex_ypos = (int)((span->tex_width-1) * tex_y);
+
+		    if (tex_z < zRow[x + j + (Viewer::width * YOFF(y))]) {
+			rgb = get_rgb(tex_xpos, tex_ypos, Polygon::texture_image);
+			zRow[x + j + (Viewer::width * YOFF(y))] = tex_z;
+			linebuf[x + j + (Viewer::width * YOFF(y))] = rgb;
+		    }
+		}
+	    }
+	}
+
+	// Cell ではこんな感じ？
+	// dma_wait(SPAN_PACK_LOAD);
+	spack = next_spack;
+    } while (spack);
+
+WRITE:
+    write_buffer(fbdev_addr, render_y);
+
+    if (zRow != NULL) free(zRow);
+    free(linebuf);
+
+    return 0;
+}