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setup a single vao, ebo, vbo for grid rendering

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This commit is contained in:
Mitchell Hashimoto
2022-04-15 08:35:49 -07:00
parent e672c9d7d5
commit 128d28a7bd
1 changed files with 44 additions and 22 deletions
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66
src/Grid.zig
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@ -22,6 +22,9 @@ cell_size: CellSize,
/// Shader program for cell rendering.
program: gl.Program,
vao: gl.VertexArray,
ebo: gl.Buffer,
vbo: gl.Buffer,
pub fn init(alloc: Allocator) !Grid {
// Initialize our font atlas. We will initially populate the
@ -73,15 +76,48 @@ pub fn init(alloc: Allocator) !Grid {
defer pbind.unbind();
try program.setUniform("cell_size", @Vector(2, f32){ cell_width, cell_height });
// Setup our VAO
const vao = try gl.VertexArray.create();
errdefer vao.destroy();
try vao.bind();
defer gl.VertexArray.unbind() catch null;
// Element buffer (EBO)
const ebo = try gl.Buffer.create();
errdefer ebo.destroy();
var ebobind = try ebo.bind(.ElementArrayBuffer);
defer ebobind.unbind();
try ebobind.setData([6]u32{
0, 1, 3, // Top-left triangle
1, 2, 3, // Bottom-right triangle
}, .StaticDraw);
// Vertex buffer (VBO)
const vbo = try gl.Buffer.create();
errdefer vbo.destroy();
var vbobind = try vbo.bind(.ArrayBuffer);
defer vbobind.unbind();
//try vbobind.setDataNull(vertices.items, .StaticDraw);
try vbobind.attribute(0, 2, [6]f32, 0);
try vbobind.attribute(1, 4, [6]f32, 2);
try vbobind.attributeDivisor(0, 1);
try vbobind.attributeDivisor(1, 1);
return Grid{
.alloc = alloc,
.cell_size = .{ .width = cell_width, .height = cell_height },
.size = .{ .rows = 0, .columns = 0 },
.program = program,
.vao = vao,
.ebo = ebo,
.vbo = vbo,
};
}
pub fn deinit(self: *Grid) void {
self.vbo.destroy();
self.ebo.destroy();
self.vao.destroy();
self.program.destroy();
self.* = undefined;
}
@ -115,19 +151,8 @@ pub fn render(self: Grid) !void {
defer pbind.unbind();
// Setup our VAO
const vao = try gl.VertexArray.create();
defer vao.destroy();
try vao.bind();
// Element buffer (EBO)
const ebo = try gl.Buffer.create();
defer ebo.destroy();
var ebobinding = try ebo.bind(.ElementArrayBuffer);
defer ebobinding.unbind();
try ebobinding.setData([6]u32{
0, 1, 3,
1, 2, 3,
}, .StaticDraw);
try self.vao.bind();
defer gl.VertexArray.unbind() catch null;
// Build our data
var vertices: std.ArrayListUnmanaged([6]f32) = .{};
@ -151,16 +176,14 @@ pub fn render(self: Grid) !void {
}
}
// Vertex buffer (VBO)
const vbo = try gl.Buffer.create();
defer vbo.destroy();
var binding = try vbo.bind(.ArrayBuffer);
// Bind EBO
var ebobind = try self.ebo.bind(.ElementArrayBuffer);
defer ebobind.unbind();
// Bind VBO and set data
var binding = try self.vbo.bind(.ArrayBuffer);
defer binding.unbind();
try binding.setData(vertices.items, .StaticDraw);
try binding.attribute(0, 2, [6]f32, 0);
try binding.attribute(1, 4, [6]f32, 2);
try binding.attributeDivisor(0, 1);
try binding.attributeDivisor(1, 1);
try gl.drawElementsInstanced(
gl.c.GL_TRIANGLES,
@ -168,7 +191,6 @@ pub fn render(self: Grid) !void {
gl.c.GL_UNSIGNED_INT,
vertices.items.len,
);
try gl.VertexArray.unbind();
}
/// The dimensions of a single "cell" in the terminal grid.