Graphics buffering changes, WIP

src/Game.zig

@@ -53,7 +53,7 @@ timer_right_arr: Timer,
 timer_right_das: Timer,
 timer_gravity: Timer,
 
-pub fn init(renderer: Renderer.Renderer) Self {
+pub fn init(renderer: *Renderer.Renderer) Self {
     var ret = Self{
         .grid = Grid.init(),
 

src/Game/Renderer.zig

@@ -10,12 +10,12 @@ const color = @import("../color.zig");
 
 const Self = @This();
 
-renderer: Renderer,
+renderer: *Renderer,
 grid_cell_size: i32,
 grid_pos_x: i32,
 grid_pos_y: i32,
 
-pub fn init(renderer: Renderer) Self {
+pub fn init(renderer: *Renderer) Self {
     var wsize = renderer.getOutputSize();
 
     const grid_cell_size = @divFloor(@minimum(wsize.width, wsize.height), 32);

src/Renderer.zig

@@ -12,6 +12,14 @@ color_loc: u32,
 buffer: gl.Buffer,
 color: [4]f32,
 
+test_counter: usize = 0,
+
+vbo: [max_objects]f32 = .{0.0} ** max_objects,
+colors: [max_objects][4]f32 = .{[4]f32{ 0.0, 0.0, 0.0, 1.0 }} ** max_objects,
+vbo_index: usize = 0,
+
+const max_objects: usize = 16384;
+
 pub fn init() !Self {
     try sdl.init(.{ .video = true, .audio = true, .events = true });
 
@@ -79,6 +87,10 @@ pub fn init() !Self {
     const buf = gl.Buffer.gen();
     buf.bind(.array_buffer);
 
+    gl.vertexAttribPointer(0, 2, .float, false, 0, 0);
+
+    gl.enableVertexAttribArray(0);
+
     gl.clearColor(0.91, 0.97, 1.00, 1.00);
 
     // TODO: See if there's a more optimal solution to this, maybe activating only when necessary
@@ -88,12 +100,30 @@ pub fn init() !Self {
     return Self{ .window = window, .context = ctx, .color_loc = color_loc, .buffer = buf, .color = .{ 0, 0, 0, 0 } };
 }
 
-pub fn render(self: Self) void {
+pub fn render(self: *Self) void {
+    std.debug.print("Numer of rendered elements: {}\n", .{self.test_counter});
+    self.test_counter = 0;
+
+    self.buffer.data(f32, &self.vbo, .static_draw);
+
+    {
+        var i: usize = 0;
+        while (i < self.vbo_index) {
+            gl.uniform4fv(self.color_loc, &.{self.colors[i]});
+            std.debug.print("Color: {any}\n", .{self.colors[i]});
+            gl.drawArrays(.triangles, i, 12);
+            i += 12;
+        }
+    }
+
+    self.vbo_index = 0;
+
     sdl.gl.swapWindow(self.window);
     gl.clear(.{ .color = true });
 }
 
-pub fn deinit(self: Self) void {
+pub fn deinit(self: *Self) void {
+    gl.disableVertexAttribArray(0);
     sdl.quit();
     self.window.destroy();
     sdl.gl.deleteContext(self.context);
@@ -108,38 +138,57 @@ pub fn setColor(self: *Self, r: u8, g: i32, b: i32, a: i32) void {
     };
 }
 
-pub fn drawRectangle(self: Self, x: i32, y: i32, w: i32, h: i32) void {
-    const indices = [_]u8{ 0, 1, 1, 2, 2, 3, 3, 0 };
-    self.renderRectangle(x, y, w, h, .lines, &indices);
+pub fn drawRectangle(self: *Self, x: i32, y: i32, w: i32, h: i32) void {
+    //const indices = [_]u8{ 0, 1, 1, 2, 2, 3, 3, 0 };
+    //self.renderRectangle(x, y, w, h, .lines, &indices);
+    _ = x;
+    _ = y;
+    _ = self;
+    _ = w;
+    _ = h;
 }
 
-pub fn fillRectangle(self: Self, x: i32, y: i32, w: i32, h: i32) void {
-    const indices = [_]u8{ 1, 3, 0, 1, 3, 2 };
-    self.renderRectangle(x, y, w, h, .triangles, &indices);
+pub fn fillRectangle(self: *Self, x: i32, y: i32, w: i32, h: i32) void {
+    //const indices = [_]u8{ 1, 3, 0, 1, 3, 2 };
+    self.renderRectangle(x, y, w, h);
 }
 
-fn renderRectangle(self: Self, x: i32, y: i32, w: i32, h: i32, primitive: gl.PrimitiveType, indices: []const u8) void {
-    gl.uniform4fv(self.color_loc, &.{self.color});
+fn renderRectangle(self: *Self, x: i32, y: i32, w: i32, h: i32) void {
+    self.test_counter += 1;
+
+    //gl.uniform4fv(self.color_loc, &.{self.color});
 
     var xf = @intToFloat(f32, x);
     var yf = @intToFloat(f32, y);
     var wf = @intToFloat(f32, w);
     var hf = @intToFloat(f32, h);
 
-    gl.vertexAttribPointer(0, 2, .float, false, 0, 0);
-
-    const vertex_buffer = [_]f32{
-        xf     , yf     , // up-left
-        xf + wf, yf     , // up-right
-        xf + wf, yf + hf, // down-right
-        xf     , yf + hf, // down-left
-    };
-
-    self.buffer.data(f32, &vertex_buffer, .static_draw);
-
-    gl.enableVertexAttribArray(0);
-    gl.drawElements(primitive, indices.len, .u8, @ptrToInt(indices.ptr));
-    gl.disableVertexAttribArray(0);
+    const i = self.vbo_index;
+    self.colors[i + 0] = self.color;
+    self.colors[i + 1] = self.color;
+    self.colors[i + 2] = self.color;
+    self.colors[i + 3] = self.color;
+    self.colors[i + 4] = self.color;
+    self.colors[i + 5] = self.color;
+    self.colors[i + 6] = self.color;
+    self.colors[i + 7] = self.color;
+    self.colors[i + 8] = self.color;
+    self.colors[i + 9] = self.color;
+    self.colors[i + 10] = self.color;
+    self.colors[i + 11] = self.color;
+    self.vbo[i + 0] = xf;
+    self.vbo[i + 1] = yf; // up-left
+    self.vbo[i + 2] = xf + wf;
+    self.vbo[i + 3] = yf; // up-right
+    self.vbo[i + 4] = xf;
+    self.vbo[i + 5] = yf + hf; // down-left
+    self.vbo[i + 6] = xf + wf;
+    self.vbo[i + 7] = yf + hf; // down-right
+    self.vbo[i + 8] = xf + wf;
+    self.vbo[i + 9] = yf; // up-right
+    self.vbo[i + 10] = xf;
+    self.vbo[i + 11] = yf + hf; // down-left
+    self.vbo_index += 12;
 }
 
 pub const OutputSize = struct { width: c_int, height: c_int };

src/main.zig

@@ -12,7 +12,7 @@ pub fn main() !void {
     defer renderer.deinit();
 
     var main_menu = MainMenu.init(renderer);
-    var game = Game.init(renderer);
+    var game = Game.init(&renderer);
 
     var current_state: State = main_menu.state;