Render Entity Shadows

docs/CHANGELOG.md

@@ -47,6 +47,7 @@
     * `Fix Crash When Generating Certain Seeds` (Enabled By Default)
     * `Click Buttons On Mouse Down` (Enabled By Default)
     * `3D Dropped Items` (Enabled By Default)
+    * `Render Entity Shadows` (Enabled By Default)
   * Existing Functionality (All Enabled By Default)
     * `Fix Screen Rendering When Hiding HUD`
     * `Sanitize Usernames`

images/CMakeLists.txt

@@ -19,6 +19,12 @@ install(
     DESTINATION "${MCPI_INSTALL_DIR}/data/images/item"
 )
 
+# Entity Shadow
+install(
+    FILES "shadow.png"
+    DESTINATION "${MCPI_INSTALL_DIR}/data/images/misc"
+)
+
 # Icon
 set(ICON_DIR "${MCPI_SHARE_DIR}/icons/hicolor/512x512/apps")
 install(

launcher/src/client/available-feature-flags

@@ -110,3 +110,4 @@ TRUE Hide Block Outline When GUI Is Hidden
 TRUE Fix Crash When Generating Certain Seeds
 TRUE Click Buttons On Mouse Down
 TRUE 3D Dropped Items
+TRUE Render Entity Shadows

mods/src/f3/f3.cpp

@@ -135,6 +135,7 @@ static std::vector<std::string> get_debug_info_right(const Minecraft *minecraft)
             }
             xyz_precision = debug_precision;
         }
+        minecraft->command_server->pos_translator.to(x, y, z);
         info.push_back("");
         info.push_back("Target X: " + to_string_with_precision(x, xyz_precision));
         info.push_back("Target Y: " + to_string_with_precision(y, xyz_precision));

mods/src/misc/graphics.cpp

@@ -90,12 +90,11 @@ static void sort_chunks(Chunk **chunks_begin, Chunk **chunks_end, const Distance
 }
 
 // Fire Rendering
-static void EntityRenderDispatcher_render_EntityRenderer_render_injection(EntityRenderer *self, Entity *entity, float x, float y, float z, float rot, float unknown) {
-    // Call Original Method
-    self->render(entity, x, y, z, rot, unknown);
-
-    // Render Fire
-    if (entity->isOnFire()) {
+static void render_fire(EntityRenderer *self, Entity *entity, const float x, float y, const float z) {
+    // Check If Entity Is On Fire
+    if (!entity->isOnFire()) {
+        return;
+    }
     // Here Be Decompiled Code
     y -= entity->height_offset;
     const int texture = Tile::fire->texture;
@@ -153,6 +152,131 @@ static void EntityRenderDispatcher_render_EntityRenderer_render_injection(Entity
     }
     t.draw();
     glPopMatrix();
+}
+
+// Entity Shadows
+static void render_shadow_tile(Tile *tile, const float x, const float y, const float z, int xt, int yt, int zt, const float pow, const float r, const float xo, const float yo, const float zo) {
+    Tesselator &t = Tesselator::instance;
+    if (!tile->isCubeShaped()) {
+        return;
+    }
+    float a = ((pow - (y - (float(yt) + yo)) / 2) * 0.5f) * EntityRenderer::entityRenderDispatcher->level->getBrightness(xt, yt, zt);
+    if (a < 0) {
+        return;
+    } else if (a > 1) {
+        a = 1;
+    }
+    t.color(255, 255, 255, int(a * 255));
+    float x0 = float(xt) + tile->x1 + xo;
+    float x1 = float(xt) + tile->x2 + xo;
+    float y0 = float(yt) + tile->y1 + yo + 1.0f / 64.0f;
+    float z0 = float(zt) + tile->z1 + zo;
+    float z1 = float(zt) + tile->z2 + zo;
+    float u0 = (x - x0) / 2 / r + 0.5f;
+    float u1 = (x - x1) / 2 / r + 0.5f;
+    float v0 = (z - z0) / 2 / r + 0.5f;
+    float v1 = (z - z1) / 2 / r + 0.5f;
+    t.vertexUV(x0, y0, z0, u0, v0);
+    t.vertexUV(x0, y0, z1, u0, v1);
+    t.vertexUV(x1, y0, z1, u1, v1);
+    t.vertexUV(x1, y0, z0, u1, v0);
+}
+static void render_shadow(const EntityRenderer *self, Entity *entity, float x, float y, float z, const float a) {
+    // Calculate Power
+    float pow = 0;
+    if (self->shadow_radius > 0) {
+        const float dist = EntityRenderer::entityRenderDispatcher->distanceToSqr(entity->x, entity->y, entity->z);
+        pow = (1 - dist / (16.0f * 16.0f)) * self->shadow_strength;
+    }
+    if (pow <= 0) {
+        return;
+    }
+    // Render
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    Textures *textures = EntityRenderer::entityRenderDispatcher->textures;
+    textures->loadAndBindTexture("misc/shadow.png");
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    Level *level = EntityRenderer::entityRenderDispatcher->level;
+    glDepthMask(false);
+    const float r = self->shadow_radius;
+    const float ex = entity->old_x + (entity->x - entity->old_x) * a;
+    float ey = entity->old_y + (entity->y - entity->old_y) * a + entity->getShadowHeightOffs() - entity->height_offset;
+    const float ez = entity->old_z + (entity->z - entity->old_z) * a;
+    const int x0 = Mth::floor(ex - r);
+    const int x1 = Mth::floor(ex + r);
+    const int y0 = Mth::floor(ey - r);
+    const int y1 = Mth::floor(ey);
+    const int z0 = Mth::floor(ez - r);
+    const int z1 = Mth::floor(ez + r);
+    const float xo = x - ex;
+    const float yo = y - ey;
+    const float zo = z - ez;
+    Tesselator &tt = Tesselator::instance;
+    tt.begin(7);
+    for (int xt = x0; xt <= x1; xt++) {
+        for (int yt = y0; yt <= y1; yt++) {
+            for (int zt = z0; zt <= z1; zt++) {
+                const int t = level->getTile(xt, yt - 1, zt);
+                if (t > 0 && level->getRawBrightness(xt, yt, zt) > 3) {
+                    render_shadow_tile(
+                        Tile::tiles[t],
+                        x, y + entity->getShadowHeightOffs() - entity->height_offset, z,
+                        xt, yt, zt,
+                        pow, r,
+                        xo, yo + entity->getShadowHeightOffs() - entity->height_offset, zo
+                    );
+                }
+            }
+        }
+    }
+    tt.draw();
+    glColor4f(1, 1, 1, 1);
+    glDisable(GL_BLEND);
+    glDepthMask(true);
+}
+static void EntityRenderDispatcher_assign_injection(EntityRenderDispatcher_assign_t original, EntityRenderDispatcher *self, const uchar entity_id, EntityRenderer *renderer) {
+    // Modify Shadow Size
+    float new_radius;
+    switch (entity_id) {
+        case 16:
+        case 3: {
+            new_radius = 0.5f;
+            break;
+        }
+        case 9:
+        case 7:
+        case 8: {
+            new_radius = 0.7f;
+            break;
+        }
+        case 6: {
+            new_radius = 0.3f;
+            break;
+        }
+        default: {
+            new_radius = renderer->shadow_radius;
+        }
+    }
+    renderer->shadow_radius = new_radius;
+    // Call Original Method
+    original(self, entity_id, renderer);
+}
+
+// Modify Entity Rendering
+static bool should_render_fire;
+static bool should_render_shadows;
+static void EntityRenderDispatcher_render_EntityRenderer_render_injection(EntityRenderer *self, Entity *entity, float x, float y, float z, float rot, float unknown) {
+    // Call Original Method
+    self->render(entity, x, y, z, rot, unknown);
+    // Render Shadow
+    if (should_render_shadows) {
+        render_shadow(self, entity, x, y, z, unknown);
+    }
+    // Render Fire
+    if (should_render_fire) {
+        render_fire(self, entity, x, y, z);
     }
 }
 
@@ -377,9 +501,12 @@ void _init_misc_graphics() {
         overwrite_calls_manual((void *) 0x51fac, (void *) sort_chunks);
     }
 
-    // Render Fire In Third-Person
-    if (feature_has("Render Fire In Third-Person", server_disabled)) {
+    // Modify Entity Rendering
     overwrite_call((void *) 0x606c0, (void *) EntityRenderDispatcher_render_EntityRenderer_render_injection);
+    should_render_fire = feature_has("Render Fire In Third-Person", server_disabled);
+    should_render_shadows = feature_has("Render Entity Shadows", server_disabled);
+    if (should_render_shadows) {
+        overwrite_calls(EntityRenderDispatcher_assign, EntityRenderDispatcher_assign_injection);
     }
 
     // Slightly Nicer Water Rendering

symbols/src/entity/Entity.def

@@ -22,15 +22,16 @@ virtual-method int getAuxData() = 0xf4;
 virtual-method bool isOnFire() = 0x90;
 virtual-method void baseTick() = 0x38;
 virtual-method bool isSneaking() = 0x88;
+virtual-method float getShadowHeightOffs() = 0x60;
 
 property float x = 0x4;
 property float y = 0x8;
 property float z = 0xc;
 property int id = 0x1c;
 property Level *level = 0x24;
-property float old_x = 0x28;
-property float old_y = 0x2c;
-property float old_z = 0x30;
+property float old_x = 0x7c;
+property float old_y = 0x80;
+property float old_z = 0x84;
 property float vel_x = 0x34;
 property float vel_y = 0x38;
 property float vel_z = 0x3c;

symbols/src/entity/EntityRenderDispatcher.def

@@ -2,8 +2,11 @@ constructor () = 0x6096c;
 
 method void assign(uchar entity_id, EntityRenderer *renderer) = 0x6094c;
 method void render(Entity *entity, float x, float y, float z, float rot, float unknown) = 0x60674;
+method float distanceToSqr(float x, float y, float z) = 0x60790;
 static-method EntityRenderDispatcher *getInstance() = 0x60e90;
 
 property ItemInHandRenderer *item_renderer = 0x0;
 property float player_rot_y = 0x14;
 property Minecraft *minecraft = 0xc;
+property Level *level = 0x8;
+property Textures *textures = 0x4;

symbols/src/entity/EntityRenderer.def

@@ -5,5 +5,8 @@ virtual-method void render(Entity *entity, float param_2, float param_3, float p
 // Can be called without an EntityRenderer, just do EntityRenderer_bindTexture->get(false)(NULL, &file);
 method void bindTexture(const std::string &file) = 0x62540;
 
+property float shadow_radius = 0x4;
+property float shadow_strength = 0x8;
+
 // Globals
 static-property EntityRenderDispatcher *entityRenderDispatcher = 0x137bc0;

symbols/src/level/LevelSource.def

@@ -1,6 +1,6 @@
 virtual-method int getTile(int x, int y, int z) = 0x8;
 virtual-method int isEmptyTile(int x, int y, int z) = 0xc;
-virtual-method int getBrightness(int x, int y, int z) = 0x10;
+virtual-method float getBrightness(int x, int y, int z) = 0x10;
 virtual-method int getData(int x, int y, int z) = 0x14;
 virtual-method Material *getMaterial(int x, int y, int z) = 0x18;
 virtual-method bool isSolidRenderTile(int x, int y, int z) = 0x1c;