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Find vertex attribute indices in advance

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This commit is contained in:
Aaron Fenyes 2024-08-21 22:36:56 -07:00
parent 5885189b04
commit 81f9b8e040
1 changed files with 9 additions and 9 deletions
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18
app-proto/inversive-display/src/main.rs
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@ -26,8 +26,7 @@ fn compile_shader(
// load the given data into the vertex input of the given name
fn bind_vertex_attrib(
context: &WebGl2RenderingContext,
program: &WebGlProgram,
name: &str,
index: u32,
size: i32,
data: &[f32]
) {
@ -48,11 +47,8 @@ fn bind_vertex_attrib(
);
}
// find the target attribute in the program's attribute list
let attrib_index = context.get_attrib_location(&program, name);
// allow the target attribute to be used
context.enable_vertex_attrib_array(attrib_index as u32);
context.enable_vertex_attrib_array(index);
// take whatever's bound to ARRAY_BUFFER---here, the data buffer created
// above---and bind it to the target attribute
@ -60,7 +56,7 @@ fn bind_vertex_attrib(
// https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/vertexAttribPointer
//
context.vertex_attrib_pointer_with_i32(
attrib_index as u32,
index,
size,
WebGl2RenderingContext::FLOAT,
false, // don't normalize
@ -150,6 +146,10 @@ fn main() {
console::log_1(&JsValue::from(link_msg));
ctx.use_program(Some(&program));
// find indices of vertex attributes
let position_index = ctx.get_attrib_location(&program, "position") as u32;
let color_index = ctx.get_attrib_location(&program, "color") as u32;
// create a vertex array and bind it to the graphics context
let vertex_array = ctx.create_vertex_array().unwrap();
ctx.bind_vertex_array(Some(&vertex_array));
@ -174,7 +174,7 @@ fn main() {
-1.0, -1.0, -7.0,
1.0, -1.0, -7.0
];
bind_vertex_attrib(&ctx, &program, "position", 3, &positions);
bind_vertex_attrib(&ctx, position_index, 3, &positions);
// set the vertex colors
let colors: [f32; 3*VERTEX_CNT] = [
@ -191,7 +191,7 @@ fn main() {
0.5, 0.0, 1.0,
0.5, 0.0, 1.0
];
bind_vertex_attrib(&ctx, &program, "color", 3, &colors);
bind_vertex_attrib(&ctx, color_index, 3, &colors);
// clear the screen and draw the scene
ctx.clear_color(0.0, 0.0, 0.0, 1.0);