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3dutils.c

/* GhettoPlay: an S3M browser and playback util
   (c)2000 Dan Potter
*/

#include <stdarg.h>
#include <stdio.h>
#include "gui.h"

/* Draw the mouse cursor at the given location */
void draw_poly_mouse(int ptrx, int ptry, float alpha) {
      pvr_vertex_t      vert;

      /* Start a textured polygon set (with the font texture) */
      pvr_prim(&util_txr_hdr, sizeof(util_txr_hdr));

      vert.flags = PVR_CMD_VERTEX;
      vert.x = ptrx;
      vert.y = ptry + 16.0f;
      vert.z = 512.0f + alpha;
      vert.u = 0.0f;
      vert.v = 16.0f / 256.0f;
      vert.argb = PVR_PACK_COLOR(0.80f * alpha, 1.0f, 1.0f, 1.0f);
      vert.oargb = 0;
      pvr_prim(&vert, sizeof(vert));
      
      vert.x = ptrx;
      vert.y = ptry;
      vert.u = 0.0f;
      vert.v = 0.0f;
      pvr_prim(&vert, sizeof(vert));
      
      vert.x = ptrx + 10.0f;
      vert.y = ptry + 16.0f;
      vert.u = 10.0f / 256.0f;
      vert.v = 16.0f / 256.0f;
      pvr_prim(&vert, sizeof(vert));

      vert.flags = PVR_CMD_VERTEX_EOL;
      vert.x = ptrx + 10.0f;
      vert.y = ptry;
      vert.u = 10.0f / 256.0f;
      vert.v = 0.0f;
      pvr_prim(&vert, sizeof(vert));
}

/* Draw one font character (12x24); assumes polygon header already sent */
void draw_poly_char(float x1, float y1, float z1, float a, float r, float g, float b, int c) {
      pvr_vertex_t      vert;
      int ix = (c % 16) * 16;
      int iy = (c / 16) * 24;
      float u1 = ix * 1.0f / 256.0f;
      float v1 = iy * 1.0f / 256.0f;
      float u2 = (ix+12) * 1.0f / 256.0f;
      float v2 = (iy+24) * 1.0f / 256.0f;

      vert.flags = PVR_CMD_VERTEX;
      vert.x = x1;
      vert.y = y1 + 24.0f;
      vert.z = z1;
      vert.u = u1;
      vert.v = v2;
      vert.argb = PVR_PACK_COLOR(a,r,g,b);
      vert.oargb = 0;
      pvr_prim(&vert, sizeof(vert));
      
      vert.x = x1;
      vert.y = y1;
      vert.u = u1;
      vert.v = v1;
      pvr_prim(&vert, sizeof(vert));
      
      vert.x = x1 + 12.0f;
      vert.y = y1 + 24.0f;
      vert.u = u2;
      vert.v = v2;
      pvr_prim(&vert, sizeof(vert));

      vert.flags = PVR_CMD_VERTEX_EOL;
      vert.x = x1 + 12.0f;
      vert.y = y1;
      vert.u = u2;
      vert.v = v1;
      pvr_prim(&vert, sizeof(vert));
}

/* Draw a set of textured polygons at the given depth and color that
   represent a string of text. */
static char strbuf[1024];
void draw_poly_strf(float x1, float y1, float z1, float a, float r,
            float g, float b, char *fmt, ...) {
      va_list args;
      char *s;
      
      va_start(args, fmt);
      vsprintf(strbuf, fmt, args);
      va_end(args);
      
      if (x1 == 0.0f)   // center text on screen (640x480)
            x1 = (640.0f - strlen(strbuf)*12.0) / 2;

      pvr_prim(&util_txr_hdr, sizeof(util_txr_hdr));
      s = strbuf;
      while (*s) {
            if (*s == ' ') {
                  x1 += 12.0f; s++;
            } else {
                  draw_poly_char(x1+=12.0f, y1, z1, a, r, g, b, *s++);
            }
      }
}


/* Draw a polygon for a shaded box; wow, a nasty looking func =) */
void draw_poly_box(float x1, float y1, float x2, float y2, float z,
            float a1, float r1, float g1, float b1,
            float a2, float r2, float g2, float b2) {
      pvr_poly_cxt_t    cxt;
      pvr_poly_hdr_t    poly;
      pvr_vertex_t      vert;

      pvr_poly_cxt_col(&cxt, PVR_LIST_TR_POLY);
      pvr_poly_compile(&poly, &cxt);
      pvr_prim(&poly, sizeof(poly));
      
      vert.flags = PVR_CMD_VERTEX;
      vert.x = x1; vert.y = y2; vert.z = z;
      vert.argb = PVR_PACK_COLOR(
            (a1+a2)/2,
            (r1+r2)/2,
            (g1+g2)/2,
            (b1+b2)/2);
      vert.oargb = 0;
      pvr_prim(&vert, sizeof(vert));
      
      vert.y = y1;
      vert.argb = PVR_PACK_COLOR(a1, r1, g1, b1);
      pvr_prim(&vert, sizeof(vert));
      
      vert.x = x2; vert.y = y2;
      vert.argb = PVR_PACK_COLOR(a2, r2, g2, b2);
      pvr_prim(&vert, sizeof(vert));
      
      vert.flags = PVR_CMD_VERTEX_EOL;
      vert.y = y1;
      vert.argb = PVR_PACK_COLOR(
            (a1+a2)/2,
            (r1+r2)/2,
            (g1+g2)/2,
            (b1+b2)/2);
      pvr_prim(&vert, sizeof(vert));
}

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