1 files changed, 42 insertions, 22 deletions

diff --git a/src/raycast.zig b/src/raycast.zig
index 41fea5d..a5bb731 100644
--- a/src/raycast.zig
+++ b/src/raycast.zig
@@ -26,17 +26,6 @@ const Colour = @import("sfml").graphics.Color;
 const level = @import("level.zig");
 const constants = @import("constants.zig");
 
-pub const RenderSliceFunction: type = fn (
-    window: RenderWindow,
-    sprite: Sprite,
-    col: i32, // which column we're in
-    top: f32, // top of wall
-    draw_frac: f32,
-    length: f32, // length of slice to be drawn
-    texfrac: f32,
-    texture: u8, // which texture index
-) void;
-
 pub fn Player(PlaneWidth: f32, PlaneHeight: f32) type {
     const FOV: f32 = std.math.pi / 3.0;
     const PlanePixels = PlaneWidth * PlaneHeight;
@@ -53,10 +42,10 @@ pub fn Player(PlaneWidth: f32, PlaneHeight: f32) type {
         vel_y: f32 = 0,
         acc_x: f32 = 0,
         acc_y: f32 = 0,
-        height: f32 = 1.8 / 2.5, // TODO
+        height: f32 = 1, // TODO
         z_buffer: std.BoundedArray(f32, PlanePixels),
 
-        // standing still at the given location, looking in direction ang,
+        // standing still at the given location, looking in direction ang
         pub fn new(pos_x: f32, pos_y: f32, ang: f32) !@This() {
             const infs = [_]f32{std.math.inf(f32)} ** PlanePixels;
             return Player(PlaneWidth, PlaneHeight){
@@ -90,20 +79,26 @@ pub fn Player(PlaneWidth: f32, PlaneHeight: f32) type {
             window: RenderWindow,
             walls_sprite: Sprite,
             objects_sprite: Sprite,
-            renderSlice: RenderSliceFunction,
+            floors_image: Image,
+            rendered_floors_texture: Texture,
+            rendered_floors_sprite: Sprite,
             map: level.Map,
-        ) void {
-            // reset the z_buffer
+        ) !void {
+            // First render the floors
+            try self.renderFloorsToTexture(floors_image, rendered_floors_texture, map);
+            window.draw(rendered_floors_sprite, null);
+
+            // then reset the z_buffer
             var i: usize = 0;
             while (i < self.z_buffer.len) : (i += 1) {
                 self.z_buffer.set(i, std.math.inf(f32));
             }
 
             // then render all the walls and populate the z_buffer
-            self.renderWalls(window, walls_sprite, renderSlice, map);
+            self.renderWalls(window, walls_sprite, map);
 
             // use the z_buffer to render sprites
-            self.renderObjects(window, objects_sprite, renderSlice, map);
+            self.renderObjects(window, objects_sprite, map);
         }
 
         fn playerDistComp(pos: [2]f32, lhs: level.Object, rhs: level.Object) bool {
@@ -119,7 +114,6 @@ pub fn Player(PlaneWidth: f32, PlaneHeight: f32) type {
             self: @This(),
             window: RenderWindow,
             objects_sprite: Sprite,
-            renderSlice: RenderSliceFunction,
             map: level.Map,
         ) void {
             std.sort.sort(level.Object, map.objects.items,
@@ -194,7 +188,6 @@ pub fn Player(PlaneWidth: f32, PlaneHeight: f32) type {
             self: *@This(),
             window: RenderWindow,
             walls_sprite: Sprite,
-            renderSlice: RenderSliceFunction,
             map: level.Map,
         ) void {
             // This is a TERRIBLE hack: for whatever reason *linearly*
@@ -316,7 +309,7 @@ pub fn Player(PlaneWidth: f32, PlaneHeight: f32) type {
             }
         }
 
-        pub fn renderFloorsToTexture(
+        fn renderFloorsToTexture(
             self: @This(),
             floors_image: Image,
             rendered_floors_texture: Texture,
@@ -372,8 +365,35 @@ pub fn Player(PlaneWidth: f32, PlaneHeight: f32) type {
                     }
                 }
             }
-
             try rendered_floors_texture.updateFromPixels(&pixels, null);
         }
+
+        // TODO: is there anyway i can say fn renderSlice : RenderSliceFunction?
+        fn renderSlice(
+            window: RenderWindow,
+            sprite: Sprite,
+            col: i32, // which column
+            top: f32, // top of wall
+            total_height: f32, // how tall
+            draw_frac: f32,
+            texfrac: f32, // how far along the texture
+            texture: u8, // which texture index
+        ) void {
+
+            // we need ceil here so that we draw always to or past the edge of the screen
+            const draw_height = @floatToInt(c_int, std.math.ceil(draw_frac * constants.TextureDim));
+            const total_length = total_height * constants.VFact;
+
+            const xpos = @intToFloat(f32, col) * constants.HFact;
+            const ypos = constants.ScreenHeight / 2 + (constants.PlaneHeight / 2 - top) * constants.VFact;
+
+            const tind = @as(c_int, texture) * @floatToInt(c_int, constants.TextureDim);
+            const left = tind + @floatToInt(c_int, texfrac * constants.TextureDim);
+
+            sprite.setPosition(.{ .x = xpos, .y = ypos });
+            sprite.setScale(.{ .x = constants.HFact, .y = total_length / constants.TextureDim });
+            sprite.setTextureRect(.{ .top = 0, .left = left, .width = 1, .height = draw_height });
+            window.draw(sprite, null);
+        }
     };
 }