Add Biome Colors To Grass

launcher/src/client/available-feature-flags

@@ -44,3 +44,4 @@ FALSE Force EGL
 TRUE Improved Classic Title Screen
 FALSE Disable Speed Bridging
 FALSE Disable Creative Mode Mining Delay
+FALSE Add Biome Colors To Grass

mods/src/misc/misc.c

@@ -332,6 +332,47 @@ HOOK(bind, int, (int sockfd, const struct sockaddr *addr, socklen_t addrlen)) {
     return (*real_bind)(sockfd, new_addr, addrlen);
 }
 
+// Change Grass Color
+static int32_t get_color(unsigned char *level_source, int32_t x, int32_t z) {
+    unsigned char *level_source_vtable = *(unsigned char **) level_source;
+    LevelSource_getBiome_t LevelSource_getBiome = *(LevelSource_getBiome_t *) (level_source_vtable + LevelSource_getBiome_vtable_offset);
+    unsigned char *biome = (*LevelSource_getBiome)(level_source, x, z);
+    if (biome == NULL) {
+        return 0;
+    }
+    return *(int32_t *) (biome + Biome_color_property_offset);
+}
+#define BIOME_BLEND_SIZE 7
+static int32_t GrassTile_getColor_injection(__attribute__((unused)) unsigned char *tile, unsigned char *level_source, int32_t x, __attribute__((unused)) int32_t y, int32_t z) {
+    int r_sum = 0;
+    int g_sum = 0;
+    int b_sum = 0;
+    int color_sum = 0;
+    int x_start = x - (BIOME_BLEND_SIZE / 2);
+    int z_start = z - (BIOME_BLEND_SIZE / 2);
+    for (int x_offset = 0; x_offset < BIOME_BLEND_SIZE; x_offset++) {
+        for (int z_offset = 0; z_offset < BIOME_BLEND_SIZE; z_offset++) {
+            int32_t color = get_color(level_source, x_start + x_offset, z_start + z_offset);
+            r_sum += (color >> 16) & 0xff;
+            g_sum += (color >> 8) & 0xff;
+            b_sum += color & 0xff;
+            color_sum++;
+        }
+    }
+    int r_avg = r_sum / color_sum;
+    int g_avg = g_sum / color_sum;
+    int b_avg = b_sum / color_sum;
+    return (r_avg << 16) | (g_avg << 8) | b_avg;
+}
+static int32_t TallGrass_getColor_injection(unsigned char *tile, unsigned char *level_source, int32_t x, int32_t y, int32_t z) {
+    int32_t original_color = (*TallGrass_getColor)(tile, level_source, x, y, z);
+    if (original_color == 0x339933) {
+        return GrassTile_getColor_injection(tile, level_source, x, y, z);
+    } else {
+        return original_color;
+    }
+}
+
 // Init
 static void nop() {
 }
@@ -437,6 +478,12 @@ void init_misc() {
         patch((void *) 0x19fa0, nop_patch);
     }
 
+    // Change Grass Color
+    if (feature_has("Add Biome Colors To Grass", server_disabled)) {
+        patch_address((void *) GrassTile_getColor_vtable_addr, (void *) GrassTile_getColor_injection);
+        patch_address((void *) TallGrass_getColor_vtable_addr, (void *) TallGrass_getColor_injection);
+    }
+
     // Init C++ And Logging
     _init_misc_cpp();
     _init_misc_logging();

symbols/include/symbols/minecraft.h

@@ -127,9 +127,21 @@ static uint32_t Tile_setSoundType_vtable_offset = 0xe8;
 typedef int32_t (*Tile_use_t)(unsigned char *tile, unsigned char *level, int32_t x, int32_t y, int32_t z, unsigned char *player);
 static uint32_t Tile_use_vtable_offset = 0x98;
 
+typedef int32_t (*Tile_getColor_t)(unsigned char *tile, unsigned char *level_source, int32_t x, int32_t y, int32_t z);
+static uint32_t Tile_getColor_vtable_offset = 0xb8;
+
 static uint32_t Tile_id_property_offset = 0x8; // int32_t
 static uint32_t Tile_category_property_offset = 0x3c; // int32_t
 
+// GrassTile
+
+static void *GrassTile_getColor_vtable_addr = (void *) 0x111660;
+
+// TallGrass
+
+static Tile_getColor_t TallGrass_getColor = (Tile_getColor_t) 0xc25fc;
+static void *TallGrass_getColor_vtable_addr = (void *) 0x1121f0;
+
 // TileRenderer
 
 typedef void (*TileRenderer_tesselateBlockInWorld_t)(unsigned char *tile_renderer, unsigned char *tile, int32_t x, int32_t y, int32_t z);
@@ -506,6 +518,11 @@ static Level_clip_t Level_clip = (Level_clip_t) 0xa3db0;
 
 static uint32_t Level_players_property_offset = 0x60; // std::vector<ServerPlayer *>
 
+// LevelSource
+
+typedef unsigned char *(*LevelSource_getBiome_t)(unsigned char *level_source, int32_t x, int32_t z);
+static uint32_t LevelSource_getBiome_vtable_offset = 0x24;
+
 // Material
 
 typedef bool (*Material_isSolid_t)(unsigned char *material);
@@ -861,6 +878,11 @@ static void *PlayerRenderer_render_vtable_addr = (void *) 0x107f08;
 typedef unsigned char *(*WorkbenchScreen_t)(unsigned char *screen, int32_t param_1);
 static WorkbenchScreen_t WorkbenchScreen = (WorkbenchScreen_t) 0x301cc;
 
+// Biome
+
+static uint32_t Biome_color_property_offset = 0x2c; // int32_t
+static uint32_t Biome_leaf_color_property_offset = 0x34; // int32_t
+
 // Method That Require C++ Types
 #ifdef __cplusplus