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render: Draw quads using Gl::TRIANGLE_FAN for WebGL 

This patch changes the mode of drawing quads to Gl::TRIANGLE_FAN.
This makes the buffers smaller, as we need only 4 vertices instead of 6,
and allows them to be reused for rendering lines.
This commit is contained in:
Kamil Jarosz 2024-06-09 11:29:19 +02:00
parent 07df84a486
commit 28b86490cc
1 changed files with 11 additions and 7 deletions
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18
render/webgl/src/lib.rs
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@ -367,7 +367,7 @@ impl WebGlRenderBackend {
.bind_buffer(Gl::ELEMENT_ARRAY_BUFFER, Some(&index_buffer));
self.gl.buffer_data_with_u8_array(
Gl::ELEMENT_ARRAY_BUFFER,
bytemuck::cast_slice(&[0u32, 1, 2, 0, 2, 3]),
bytemuck::cast_slice(&[0u32, 1, 2, 3]),
Gl::STATIC_DRAW,
);
@ -422,8 +422,8 @@ impl WebGlRenderBackend {
gl: self.gl.clone(),
buffer: index_buffer,
},
num_indices: 6,
num_mask_indices: 6,
num_indices: 4,
num_mask_indices: 4,
});
Ok(draws)
}
@ -892,8 +892,12 @@ impl WebGlRenderBackend {
// Render the quad.
let quad = &self.bitmap_quad_draws;
self.bind_vertex_array(Some(&quad[0].vao));
self.gl
.draw_elements_with_i32(Gl::TRIANGLES, quad[0].num_indices, Gl::UNSIGNED_INT, 0);
self.gl.draw_elements_with_i32(
Gl::TRIANGLE_FAN,
quad[0].num_indices,
Gl::UNSIGNED_INT,
0,
);
}
}
@ -970,7 +974,7 @@ impl WebGlRenderBackend {
self.bind_vertex_array(Some(&quad[0].vao));
self.gl
.draw_elements_with_i32(Gl::TRIANGLES, quad[0].num_indices, Gl::UNSIGNED_INT, 0);
.draw_elements_with_i32(Gl::TRIANGLE_FAN, quad[0].num_indices, Gl::UNSIGNED_INT, 0);
}
}
@ -1336,7 +1340,7 @@ impl CommandHandler for WebGlRenderBackend {
// Draw the triangles.
self.gl
.draw_elements_with_i32(Gl::TRIANGLES, draw.num_indices, Gl::UNSIGNED_INT, 0);
.draw_elements_with_i32(Gl::TRIANGLE_FAN, draw.num_indices, Gl::UNSIGNED_INT, 0);
}
fn render_shape(&mut self, shape: ShapeHandle, transform: Transform) {