remove procgen, use stb_perlin

CMakeLists.txt

@@ -48,7 +48,6 @@ set(TOWNENGINE_SOURCE_FILES
         townengine/text.c townengine/text.h
         townengine/camera.c townengine/camera.h
         townengine/textures/textures.c
-        townengine/procgen/perlin2d.c
 
         ${SYSTEM_SOURCE_FILES}
 )

apps/testgame/game.c

@@ -44,7 +44,7 @@ void game_tick(void) {
         input_bind_action_scancode(&ctx.input, "ui_accept", SDL_SCANCODE_RETURN);
 
         input_add_action(&ctx.input, "mouse_capture_toggle");
-        input_bind_action_scancode(&ctx.input, "mouse_capture_toggle", SDL_SCANCODE_END);
+        input_bind_action_scancode(&ctx.input, "mouse_capture_toggle", SDL_SCANCODE_ESCAPE);
     }
 
     struct state *state = ctx.udata;

apps/testgame/scenes/ingame.c

@@ -3,6 +3,10 @@
 #include "scene.h"
 
 #include "townengine/game_api.h"
+#include "townengine/tabela.h"
+
+#define STB_PERLIN_IMPLEMENTATION
+#include <stb_perlin.h>
 
 
 static void ingame_tick(struct state *state) {
@@ -82,12 +86,14 @@ static void ingame_tick(struct state *state) {
 
     set_camera(&cam);
 
-    for (int y = 64; y--;)
+    #define TERRAIN_FREQUENCY 0.1f
+
+    for (int y = 64; y--;) {
         for (int x = 64; x--;) {
-            float d0 = sample_perlin_2d((t_fvec2){x, y}, 0.2, 5) * 8 - 6;
+            float d0 = stb_perlin_noise3((float)x       * TERRAIN_FREQUENCY, (float)y       * TERRAIN_FREQUENCY, 0, 0, 0, 0) * 10 - 6;
-            float d1 = sample_perlin_2d((t_fvec2){x + 1, y}, 0.2, 5) * 8 - 6;
+            float d1 = stb_perlin_noise3((float)(x + 1) * TERRAIN_FREQUENCY, (float)y       * TERRAIN_FREQUENCY, 0, 0, 0, 0) * 10 - 6;
-            float d2 = sample_perlin_2d((t_fvec2){x + 1, y - 1}, 0.2, 5) * 8 - 6;
+            float d2 = stb_perlin_noise3((float)(x + 1) * TERRAIN_FREQUENCY, (float)(y - 1) * TERRAIN_FREQUENCY, 0, 0, 0, 0) * 10 - 6;
-            float d3 = sample_perlin_2d((t_fvec2){x, y - 1}, 0.2, 5) * 8 - 6;
+            float d3 = stb_perlin_noise3((float)x       * TERRAIN_FREQUENCY, (float)(y - 1) * TERRAIN_FREQUENCY, 0, 0, 0, 0) * 10 - 6;
 
             unfurl_triangle("/assets/grass.gif",
                             (t_fvec3){ x, d0, y },
@@ -105,6 +111,7 @@ static void ingame_tick(struct state *state) {
                             (t_shvec2){ 0, 0 },
                             (t_shvec2){ 0, 768 });
         }
+    }
 }
 
 

townengine/game_api.h

@@ -7,7 +7,6 @@
 #include "rendering.h"
 #include "audio.h"
 #include "util.h"
-#include "procgen.h"
 #include "input.h"
 
 /* application provided */

townengine/procgen.h

@@ -1,6 +0,0 @@
-#ifndef PROCGEN_H
-#define PROCGEN_H
-
-#include "procgen/perlin.h"
-
-#endif

townengine/procgen/perlin.h

@@ -1,10 +0,0 @@
-#ifndef PROCGEN_PERLIN_H
-#define PROCGEN_PERLIN_H
-
-#include "../vec.h"
-
-void set_perlin_2d_seed(uint32_t seed);
-
-float sample_perlin_2d(t_fvec2 position, float frequency, uint8_t octaves);
-
-#endif

townengine/procgen/perlin2d.c

@@ -1,70 +0,0 @@
-#include "perlin.h"
-#include "../vec.h"
-
-static uint32_t seed = 0;
-
-static const uint8_t hash[] = { 208,34,231,213,32,248,233,56,161,78,24,140,71,48,140,254,245,255,247,247,40,
-                                185,248,251,245,28,124,204,204,76,36,1,107,28,234,163,202,224,245,128,167,204,
-                                9,92,217,54,239,174,173,102,193,189,190,121,100,108,167,44,43,77,180,204,8,81,
-                                70,223,11,38,24,254,210,210,177,32,81,195,243,125,8,169,112,32,97,53,195,13,
-                                203,9,47,104,125,117,114,124,165,203,181,235,193,206,70,180,174,0,167,181,41,
-                                164,30,116,127,198,245,146,87,224,149,206,57,4,192,210,65,210,129,240,178,105,
-                                228,108,245,148,140,40,35,195,38,58,65,207,215,253,65,85,208,76,62,3,237,55,89,
-                                232,50,217,64,244,157,199,121,252,90,17,212,203,149,152,140,187,234,177,73,174,
-                                193,100,192,143,97,53,145,135,19,103,13,90,135,151,199,91,239,247,33,39,145,
-                                101,120,99,3,186,86,99,41,237,203,111,79,220,135,158,42,30,154,120,67,87,167,
-                                135,176,183,191,253,115,184,21,233,58,129,233,142,39,128,211,118,137,139,255,
-                                114,20,218,113,154,27,127,246,250,1,8,198,250,209,92,222,173,21,88,102,219 };
-
-void set_perlin_2d_seed(uint32_t s) {
-    seed = s;
-}
-
-static int32_t noise2(int x, int y)
-{
-    int tmp = hash[(y + seed) % 256];
-    return hash[(tmp + x) % 256];
-}
-
-static float lin_inter(float x, float y, float s)
-{
-    return x + s * (y-x);
-}
-
-static float smooth_inter(float x, float y, float s)
-{
-    return lin_inter(x, y, s * s * (3-2*s));
-}
-
-static float noise2d(float x, float y)
-{
-    int32_t x_int = (int32_t)x;
-    int32_t y_int = (int32_t)y;
-    float x_frac = x - (float)x_int;
-    float y_frac = y - (float)y_int;
-    int32_t s = noise2(x_int, y_int);
-    int32_t t = noise2(x_int + 1, y_int);
-    int32_t u = noise2(x_int, y_int + 1);
-    int v = noise2(x_int + 1, y_int + 1);
-    float low = smooth_inter((float)s, (float)t, x_frac);
-    float high = smooth_inter((float)u, (float)v, x_frac);
-    return smooth_inter(low, high, y_frac);
-}
-
-/* https://gist.github.com/nowl/828013 */
-float sample_perlin_2d(t_fvec2 position, float frequency, uint8_t octaves) {
-    t_fvec2 a = m_vec_scale(position, frequency);
-    float amp = 1.0;
-    float fin = 0;
-    float div = 0.0;
-
-    for(uint8_t i = 0; i < octaves; i++)
-    {
-        div += 256 * amp;
-        fin += noise2d(a.x, a.y) * amp;
-        amp /= 2;
-        a = m_vec_scale(a, 2);
-    }
-
-    return fin/div;
-}

townengine/util.h

@@ -1,7 +1,7 @@
 #ifndef UTIL_H
 #define UTIL_H
 
-#include "vec.h"
+#include "townengine/vec.h"
 
 #include <SDL2/SDL.h>
 #include <physfs.h>