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Make vertex buffers optional (#1485)

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For some cases, like driving a full screen fragment shader, it is sometimes convenient to not have to create and upload a mesh because the necessary vertices are simple to synthesize in the vertex shader. Bevy's existing pipeline compiler assumes that there will always be a vertex buffer. This PR changes that such that vertex buffer descriptor is only added to the pipeline layout if there are vertex attributes in the shader.
This commit is contained in:
Alec Deason 2021-02-22 03:43:27 +00:00
parent 2e3af84590
commit 97a78c3698
1 changed files with 3 additions and 1 deletions
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crates/bevy_render/src/pipeline/pipeline_compiler.rs
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@ -235,7 +235,9 @@ impl PipelineCompiler {
//TODO: add other buffers (like instancing) here
let mut vertex_buffer_descriptors = Vec::<VertexBufferLayout>::default();
vertex_buffer_descriptors.push(compiled_vertex_buffer_descriptor);
if !pipeline_layout.vertex_buffer_descriptors.is_empty() {
vertex_buffer_descriptors.push(compiled_vertex_buffer_descriptor);
}
pipeline_layout.vertex_buffer_descriptors = vertex_buffer_descriptors;
specialized_descriptor.multisample.count = pipeline_specialization.sample_count;