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Use index buffers to draw a rectangle

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This commit is contained in:
Bob Shelline 2020-11-04 20:00:24 -07:00
parent dda634cf0a
commit d7a902e3aa
2 changed files with 26 additions and 7 deletions
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19
editor/src/lib.rs
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@ -222,10 +222,17 @@ fn run_event_loop() -> Result<(), Box<dyn Error>> {
// Vertex Buffer for drawing rectangles
let vertex_buffer = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
label: Some("Vertex Buffer"),
contents: bytemuck::cast_slice(&vertex::test()),
contents: bytemuck::cast_slice(&vertex::vertex_buffer_test()),
usage: wgpu::BufferUsage::VERTEX,
});
// Index Buffer for drawing rectangles
let index_buffer = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
label: Some("Index Buffer"),
contents: bytemuck::cast_slice(&vertex::index_buffer_test()),
usage: wgpu::BufferUsage::INDEX,
});
// Clear frame
{
let mut render_pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
@ -251,9 +258,13 @@ fn run_event_loop() -> Result<(), Box<dyn Error>> {
0, // The buffer slot to use for this vertex buffer.
vertex_buffer.slice(..), // Use the entire buffer.
);
render_pass.draw(
0..((&vertex::test()).len() as u32), // Draw all of the vertices from our test data.
0..1, // Instances
render_pass.set_index_buffer(index_buffer.slice(..));
render_pass.draw_indexed(
0..((&vertex::index_buffer_test()).len() as u32), // Draw all of the vertices from our test data.
0, // Base Vertex
0..1, // Instances
);
}