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|
use std::any::TypeId;
use opengl_bindings::CurrentContextWithFns as GlCurrentContextWithFns;
use opengl_bindings::buffer::{Buffer as GlBuffer, Usage as GlBufferUsage};
use opengl_bindings::vertex_array::{
AttributeFormat as GlVertexArrayAttributeFormat,
BindVertexBufferError as GlVertexArrayBindVertexBufferError,
DataType as GlVertexArrayDataType,
VertexArray as GlVertexArray,
VertexBufferSpec as GlVertexArrayVertexBufferSpec,
};
use zerocopy::IntoBytes;
use crate::mesh::Mesh;
use crate::reflection::Reflection;
use crate::shader::VertexSubset as ShaderVertexSubset;
#[derive(Debug)]
pub struct GraphicsMesh
{
/// Vertex and index buffer has to live as long as the vertex array
vertex_buffer: GlBuffer<u8>,
pub index_buffer: Option<GlBuffer<u32>>,
pub element_cnt: u32,
pub vertex_arr: GlVertexArray,
}
impl GraphicsMesh
{
#[tracing::instrument(skip_all)]
pub fn new(
current_context: &GlCurrentContextWithFns<'_>,
mesh: &Mesh,
vertex_subset: &ShaderVertexSubset,
) -> Result<Self, Error>
{
let vertex_arr = GlVertexArray::new(current_context);
let vertex_buffer = GlBuffer::new(current_context);
vertex_buffer
.init(
current_context,
vertex_subset.layout.size() * mesh.vertices().len(),
GlBufferUsage::Static,
)
.map_err(Error::InitVertexBufferFailed)?;
for (vertex_index, vertex) in mesh.vertices().iter().enumerate() {
let vertex_bytes = vertex.as_bytes();
for vertex_subset_field in vertex_subset.fields.iter().flatten() {
let vertex_buffer_offset = (vertex_subset.layout.size() * vertex_index)
+ vertex_subset_field.offset;
let vertex_field_start_offset =
vertex_subset_field.reflection.byte_offset;
let vertex_field_size = vertex_subset_field.reflection.layout.size();
vertex_buffer
.store_at_byte_offset(
current_context,
vertex_buffer_offset,
&vertex_bytes[vertex_field_start_offset
..vertex_field_start_offset + vertex_field_size],
)
.map_err(Error::StoreVerticesFailed)?;
}
}
let vertex_buf_binding_index = 0;
if let Err(err) = vertex_arr.bind_vertex_buffer(
current_context,
vertex_buf_binding_index,
&vertex_buffer,
GlVertexArrayVertexBufferSpec {
offset: 0,
vertex_size: vertex_subset.layout.size(),
},
) {
match err {
GlVertexArrayBindVertexBufferError::OffsetValueTooLarge {
value: _,
max_value: _,
} => unreachable!(),
GlVertexArrayBindVertexBufferError::VertexSizeValueTooLarge {
value,
max_value,
} => {
panic!(
"Size of vertex ({}) is too large. Must be less than {max_value}",
value
);
}
}
}
for vertex_subset_field in vertex_subset.fields.iter().flatten() {
let attrib_index: u32 =
vertex_subset_field.varying_input_offset.try_into().unwrap();
vertex_arr.enable_attrib(current_context, attrib_index);
vertex_arr.set_attrib_format(
current_context,
attrib_index,
match vertex_subset_field.reflection.reflection {
Reflection::Literal(_) => {
if vertex_subset_field.reflection.type_id != TypeId::of::<f32>() {
panic!("Unsupported vertex field data type");
}
GlVertexArrayAttributeFormat {
data_type: GlVertexArrayDataType::Float,
count: 1,
normalized: false,
offset: vertex_subset_field.offset.try_into().unwrap(),
}
}
Reflection::Array(array_vertex_field) => {
let Reflection::Literal(array_vertex_field_item) =
array_vertex_field.item_reflection
else {
panic!("Unsupported array item type in vertex field");
};
if array_vertex_field_item.type_id != TypeId::of::<f32>() {
panic!("Unsupported array item type in vertex field");
}
GlVertexArrayAttributeFormat {
data_type: GlVertexArrayDataType::Float,
count: array_vertex_field.length.try_into().unwrap(),
normalized: false,
offset: vertex_subset_field.offset.try_into().unwrap(),
}
}
_ => panic!("Unsupported vertex field data type"),
},
);
vertex_arr.set_attrib_vertex_buf_binding(
current_context,
attrib_index,
vertex_buf_binding_index,
);
}
if let Some(indices) = mesh.indices() {
let index_buffer = GlBuffer::new(current_context);
index_buffer
.store(current_context, indices, GlBufferUsage::Static)
.map_err(Error::StoreIndicesFailed)?;
vertex_arr.bind_element_buffer(current_context, &index_buffer);
return Ok(Self {
vertex_buffer: vertex_buffer,
index_buffer: Some(index_buffer),
element_cnt: indices
.len()
.try_into()
.expect("Mesh index count does not fit into a 32-bit unsigned int"),
vertex_arr,
});
}
Ok(Self {
vertex_buffer: vertex_buffer,
index_buffer: None,
element_cnt: mesh
.vertices()
.len()
.try_into()
.expect("Mesh vertex count does not fit into a 32-bit unsigned int"),
vertex_arr,
})
}
pub fn destroy(&mut self, curr_gl_ctx: &GlCurrentContextWithFns<'_>)
{
self.vertex_arr.delete(curr_gl_ctx);
self.vertex_buffer.delete(curr_gl_ctx);
if let Some(index_buffer) = &self.index_buffer {
index_buffer.delete(curr_gl_ctx);
}
}
}
#[derive(Debug, thiserror::Error)]
pub enum Error
{
#[error("Failed to initialize vertex buffer")]
InitVertexBufferFailed(#[source] opengl_bindings::buffer::Error),
#[error("Failed to store vertices in vertex buffer")]
StoreVerticesFailed(#[source] opengl_bindings::buffer::Error),
#[error("Failed to store indices in index buffer")]
StoreIndicesFailed(#[source] opengl_bindings::buffer::Error),
}
|
