optional high-quality but slower calculation of attribute slopes across

[dosdemo] / src / polytest.c

diff --git a/src/polytest.c b/src/polytest.c
index 0217916..0d5187d 100644 (file)
--- a/src/polytest.c
+++ b/src/polytest.c
@@ -5,6 +5,8 @@
 #include "screen.h"
 #include "demo.h"
 #include "3dgfx.h"
+#include "gfxutil.h"
+#include "polyfill.h"  /* just for struct pimage */
 
 struct mesh {
        int prim;
@@ -21,6 +23,8 @@ 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 int gen_texture(struct pimage *img, int xsz, int ysz);
 
 static struct screen scr = {
        "polytest",
@@ -30,8 +34,15 @@ static struct screen scr = {
        draw
 };
 
+static float theta, phi = 25;
 static struct mesh cube, torus;
 
+static struct pimage tex;
+
+#define LOWRES_SCALE   10
+static uint16_t *lowres_pixels;
+static int lowres_width, lowres_height;
+
 struct screen *polytest_screen(void)
 {
        return &scr;
@@ -39,13 +50,31 @@ struct screen *polytest_screen(void)
 
 static int init(void)
 {
+       int i;
+
        gen_cube(&cube, 1.0);
        gen_torus(&torus, 1.0, 0.25, 24, 12);
+       /* scale texcoords */
+       for(i=0; i<torus.vcount; i++) {
+               torus.varr[i].u *= 4.0;
+               torus.varr[i].v *= 2.0;
+       }
+
+       gen_texture(&tex, 128, 128);
+
+#ifdef DEBUG_POLYFILL
+       lowres_width = fb_width / LOWRES_SCALE;
+       lowres_height = fb_height / LOWRES_SCALE;
+       lowres_pixels = malloc(lowres_width * lowres_height * 2);
+       scr.draw = draw_debug;
+#endif
+
        return 0;
 }
 
 static void destroy(void)
 {
+       free(lowres_pixels);
        free(cube.varr);
        free(torus.varr);
        free(torus.iarr);
@@ -58,38 +87,88 @@ static void start(long trans_time)
        g3d_perspective(50.0, 1.3333333, 0.5, 100.0);
 
        g3d_enable(G3D_CULL_FACE);
+       g3d_enable(G3D_LIGHTING);
+       g3d_enable(G3D_LIGHT0);
+
+       g3d_polygon_mode(G3D_TEX_GOURAUD);
 }
 
-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 * 1.0;
+                               phi += dy * 1.0;
 
-               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);
 
        g3d_matrix_mode(G3D_MODELVIEW);
        g3d_load_identity();
-       g3d_translate(0, 0, -5);
+       g3d_translate(0, 0, -3);
        g3d_rotate(phi, 1, 0, 0);
        g3d_rotate(theta, 0, 1, 0);
 
+       g3d_light_pos(0, -10, 10, 20);
+
        zsort(&torus);
+
+       g3d_mtl_diffuse(0.4, 0.7, 1.0);
+       g3d_set_texture(tex.width, tex.height, tex.pixels);
+
        draw_mesh(&torus);
+
+       /*draw_mesh(&cube);*/
+       swap_buffers(fb_pixels);
+}
+
+static void draw_debug(void)
+{
+       update();
+
+       memset(lowres_pixels, 0, lowres_width * lowres_height * 2);
+
+       g3d_matrix_mode(G3D_MODELVIEW);
+       g3d_load_identity();
+       g3d_translate(0, 0, -3);
+       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);
 }
 
 static void draw_mesh(struct mesh *mesh)
@@ -204,6 +283,8 @@ static int gen_torus(struct mesh *mesh, float rad, float ringrad, int usub, int
        nfaces = usub * vsub;
        mesh->icount = nfaces * 4;
 
+       printf("generating torus with %d faces (%d vertices)\n", nfaces, mesh->vcount);
+
        if(!(mesh->varr = malloc(mesh->vcount * sizeof *mesh->varr))) {
                return -1;
        }
@@ -286,3 +367,54 @@ 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;
+       }
+}
+
+static int gen_texture(struct pimage *img, int xsz, int ysz)
+{
+       int i, j;
+       uint16_t *pix;
+
+       if(!(img->pixels = malloc(xsz * ysz * sizeof *pix))) {
+               return -1;
+       }
+       pix = img->pixels;
+
+       for(i=0; i<ysz; i++) {
+               for(j=0; j<xsz; j++) {
+                       int val = i ^ j;
+
+                       *pix++ = PACK_RGB16(val, val, val);
+               }
+       }
+
+       img->width = xsz;
+       img->height = ysz;
+       return 0;
+}