3dfx info mode (#443)

* adds third debug info mode added in 3dfx patch

* fix DRPixelmapHasZeros

src/DETHRACE/common/mainloop.c

@@ -67,7 +67,13 @@ void ToggleInfo(void) {
         } else {
             gInfo_on = !gInfo_on;
             if (gInfo_on) {
+#ifdef DETHRACE_3DFX_PATCH
+                if (PDKeyDown(KEY_SHIFT_ANY)) {
+                    gInfo_mode = (gInfo_mode + 1) % 3;
+                }
+#else
                 gInfo_mode = PDKeyDown(KEY_SHIFT_ANY);
+#endif
             }
         }
     }
@@ -146,17 +152,8 @@ void MungeHeadups(void) {
     gMr_odo = (double)gFrame_period * gProgram_state.current_car.speedo_speed * WORLD_SCALE / 1600.0 + gMr_odo;
     if (gInfo_on) {
         bearing = 360.0 - FastScalarArcTan2(gCamera_to_world.m[0][2], gCamera_to_world.m[2][2]);
-        if (gInfo_mode) {
-            sprintf(
-                the_text,
-                "P'cam: curr=%d, ambi=%d, pend=%d Car: c=%+.3f, a=%+.3f, b=%+.3f",
-                PratcamGetCurrent(),
-                PratcamGetAmbient(),
-                PratcamGetPending(),
-                gCar_to_view->curvature,
-                gCar_to_view->acc_force,
-                gCar_to_view->brake_force);
-        } else {
+        switch (gInfo_mode) {
+        case 0:
             sprintf(
                 the_text,
                 "%d.%d (%.3f, %.3f, %.3f) %.0f, %.0f, MILES=%.2f",
@@ -168,6 +165,45 @@ void MungeHeadups(void) {
                 gCamera_to_horiz_angle,
                 bearing,
                 gMr_odo);
+            break;
+        case 1:
+            sprintf(
+                the_text,
+                "P'cam: curr=%d, ambi=%d, pend=%d Car: c=%+.3f, a=%+.3f, b=%+.3f",
+                PratcamGetCurrent(),
+                PratcamGetAmbient(),
+                PratcamGetPending(),
+                gCar_to_view->curvature,
+                gCar_to_view->acc_force,
+                gCar_to_view->brake_force);
+            break;
+#ifdef DETHRACE_3DFX_PATCH
+        case 2:
+            nearby = SomeNearbyMaterial();
+            strcpy(the_text, nearby->identifier);
+            if (nearby->colour_map != NULL) {
+                sprintf(&the_text[strlen(the_text)], " %s", nearby->colour_map->identifier);
+                user = (tPixelmap_user_data*)nearby->colour_map->user;
+                if (user != NULL) {
+                    sprintf(&the_text[strlen(the_text)], " %dx%d to", user->orig_width, user->orig_height);
+                } else {
+                    sprintf(&the_text[strlen(the_text)], " %dx%d", nearby->colour_map->width, nearby->colour_map->height);
+                }
+                if ((nearby->flags & BR_MATF_MAP_INTERPOLATION)) {
+                    strcat(the_text, " bilinear");
+                } else {
+                    strcat(the_text, " nobilinear");
+                }
+                if ((nearby->flags & BR_MATF_MAP_ANTIALIASING) && nearby->colour_map != NULL && nearby->colour_map->mip_offset != 0) {
+                    strcat(the_text, " mipmap");
+                } else {
+                    strcat(the_text, " nomipmap");
+                }
+                break;
+            }
+#endif
+        default:
+            break;
         }
         ChangeHeadupText(gProgram_state.frame_rate_headup, the_text);
     } else {

src/DETHRACE/common/opponent.c

@@ -2443,9 +2443,8 @@ void InitOpponents(tRace_info* pRace_info) {
     gHead_on_cos_value = cosf(.5235668f);
     gAcme_frame_count = 0;
     gProgram_state.current_car.no_of_processes_recording_my_trail = 0;
-    rank_dependent_difficulty = (101.f - (gCurrent_race.suggested_rank < 10 ? .5f : (float)gCurrent_race.suggested_rank));
-    // FIXME: unsure about gBig_bang
-    gBig_bang = 70.f - (float)(3 * rank_dependent_difficulty + 10 * gProgram_state.skill_level) * gOpponent_nastyness_frigger;
+    rank_dependent_difficulty = (101.f - (gCurrent_race.suggested_rank < 10 ? .5f : gCurrent_race.suggested_rank)) / 10.0f;
+    gBig_bang = 70.f - (3 * rank_dependent_difficulty + 10 * gProgram_state.skill_level) * gOpponent_nastyness_frigger;
     gIn_view_distance = gCamera_yon + 10.f;
     if (gCamera_yon + 10.f <= 45.f) {
         gIn_view_distance = 45.f;

src/DETHRACE/common/utility.c

@@ -1735,8 +1735,7 @@ void GlorifyMaterial(br_material** pArray, int pCount) {
 
             if (gInterpolate_textures) {
                 // use linear texture filtering unless we have a "nobilinear" flag or the texture has transparent parts
-                if ((e == NULL || (e->flags & ExceptionFlag_NoBilinear) == 0)
-                    && !DRPixelmapHasZeros(pArray[i]->colour_map)) {
+                if ((e == NULL || (e->flags & ExceptionFlag_NoBilinear) == 0) && !DRPixelmapHasZeros(pArray[i]->colour_map)) {
                     pArray[i]->flags |= BR_MATF_MAP_INTERPOLATION;
                 }
             }

src/DETHRACE/common/world.c

@@ -1946,11 +1946,13 @@ int DRPixelmapHasZeros(br_pixelmap* pm) {
     if (pm->flags & BR_PMF_NO_ACCESS) {
         return 1;
     }
+
     row_ptr = (char*)pm->pixels + (pm->row_bytes * pm->base_y) + pm->base_x;
     for (y = 0; y < pm->height; y++) {
         pp = row_ptr;
         for (x = 0; x < pm->width; x++) {
-            if (!pp)
+            // found a zero (transparent) pixel?
+            if (*pp == 0)
                 return 1;
             pp++;
         }