setting up to improve the rasterizer

[dosdemo] / src / polytest.c

diff --git a/src/polytest.c b/src/polytest.c
index f1835d4..b9ad891 100644 (file)
--- a/src/polytest.c
+++ b/src/polytest.c
@@ -5,6 +5,7 @@
 #include "screen.h"
 #include "demo.h"
 #include "3dgfx.h"
+#include "gfxutil.h"
 
 struct mesh {
        int prim;
@@ -21,6 +22,7 @@ static void draw_mesh(struct mesh *mesh);
 static int gen_cube(struct mesh *mesh, float sz);
 static int gen_torus(struct mesh *mesh, float rad, float ringrad, int usub, int vsub);
 static void zsort(struct mesh *m);
+static void draw_lowres_raster(void);
 
 static struct screen scr = {
        "polytest",
@@ -30,8 +32,13 @@ static struct screen scr = {
        draw
 };
 
+static float theta, phi = 25;
 static struct mesh cube, torus;
 
+#define LOWRES_SCALE   16
+static uint16_t *lowres_pixels;
+static int lowres_width, lowres_height;
+
 struct screen *polytest_screen(void)
 {
        return &scr;
@@ -41,11 +48,17 @@ static int init(void)
 {
        gen_cube(&cube, 1.0);
        gen_torus(&torus, 1.0, 0.25, 24, 12);
+
+       lowres_width = fb_width / LOWRES_SCALE;
+       lowres_height = fb_height / LOWRES_SCALE;
+       lowres_pixels = malloc(lowres_width * lowres_height * 2);
+
        return 0;
 }
 
 static void destroy(void)
 {
+       free(lowres_pixels);
        free(cube.varr);
        free(torus.varr);
        free(torus.iarr);
@@ -60,27 +73,35 @@ static void start(long trans_time)
        g3d_enable(G3D_CULL_FACE);
 }
 
-static void draw(void)
+static void update(void)
 {
        static int prev_mx, prev_my;
-       static float theta, phi = 25;
+       static unsigned int prev_bmask;
 
-       int dx = mouse_x - prev_mx;
-       int dy = mouse_y - prev_my;
-       prev_mx = mouse_x;
-       prev_my = mouse_y;
+       if(mouse_bmask) {
+               if(mouse_bmask ^ prev_bmask == 0) {
+                       int dx = mouse_x - prev_mx;
+                       int dy = mouse_y - prev_my;
 
-       if(dx || dy) {
-               theta += dx * 2.0;
-               phi += dy * 2.0;
+                       if(dx || dy) {
+                               theta += dx * 2.0;
+                               phi += dy * 2.0;
 
-               if(phi < -90) phi = -90;
-               if(phi > 90) phi = 90;
+                               if(phi < -90) phi = -90;
+                               if(phi > 90) phi = 90;
+                       }
+               }
        }
+       prev_mx = mouse_x;
+       prev_my = mouse_y;
+       prev_bmask = mouse_bmask;
+}
 
-       /*float angle = (float)time_msec / 50.0;*/
+static void draw(void)
+{
+       update();
 
-       memset(fb_pixels, 0, fb_width * fb_height * 2);
+       memset(lowres_pixels, 0, lowres_width * lowres_height * 2);
 
        g3d_matrix_mode(G3D_MODELVIEW);
        g3d_load_identity();
@@ -88,9 +109,19 @@ static void draw(void)
        g3d_rotate(phi, 1, 0, 0);
        g3d_rotate(theta, 0, 1, 0);
 
+       g3d_framebuffer(lowres_width, lowres_height, lowres_pixels);
        /*zsort(&torus);*/
        draw_mesh(&cube);
 
+       draw_lowres_raster();
+
+
+       g3d_framebuffer(fb_width, fb_height, fb_pixels);
+
+       g3d_polygon_mode(G3D_WIRE);
+       draw_mesh(&cube);
+       g3d_polygon_mode(G3D_FLAT);
+
        swap_buffers(fb_pixels);
 }
 
@@ -288,3 +319,31 @@ static void zsort(struct mesh *m)
 
        qsort(m->iarr, nfaces, m->prim * sizeof *m->iarr, zsort_cmp);
 }
+
+static void draw_huge_pixel(uint16_t *dest, int dest_width, uint16_t color)
+{
+       int i, j;
+       uint16_t grid_color = PACK_RGB16(127, 127, 127);
+
+       for(i=0; i<LOWRES_SCALE; i++) {
+               for(j=0; j<LOWRES_SCALE; j++) {
+                       dest[j] = i == 0 || j == 0 ? grid_color : color;
+               }
+               dest += dest_width;
+       }
+}
+
+static void draw_lowres_raster(void)
+{
+       int i, j;
+       uint16_t *sptr = lowres_pixels;
+       uint16_t *dptr = fb_pixels;
+
+       for(i=0; i<lowres_height; i++) {
+               for(j=0; j<lowres_width; j++) {
+                       draw_huge_pixel(dptr, fb_width, *sptr++);
+                       dptr += LOWRES_SCALE;
+               }
+               dptr += fb_width * LOWRES_SCALE - fb_width;
+       }
+}