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Vertex input: description, mental model, naming #469

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Merged
kainino0x merged 6 commits into from
Nov 4, 2019
Merged

Vertex input: description, mental model, naming #469

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Vertex input: description, mental model, naming
kainino0x Oct 8, 2019
35d81c8
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kainino0x Oct 11, 2019
025cb6c
Merge branch 'master' into vertex-inputs-again
kainino0x Oct 30, 2019
5de73d3
StructureMember -> Attribute
kainino0x Oct 30, 2019
4020d46
VertexInput -> VertexState, VertexBufferDescriptor -> VertexBufferLay…
kainino0x Oct 30, 2019
6b24523
Merge branch 'master' into vertex-inputs-again
kainino0x Nov 4, 2019
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41 changes: 28 additions & 13 deletions spec/index.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -1273,7 +1273,7 @@ dictionary GPURenderPipelineDescriptor : GPUPipelineDescriptorBase {
GPURasterizationStateDescriptor rasterizationState = {};
required sequence<GPUColorStateDescriptor> colorStates;
GPUDepthStencilStateDescriptor depthStencilState;
GPUVertexInputDescriptor vertexInput = {};
GPUVertexStateDescriptor vertexState = {};

unsigned long sampleCount = 1;
unsigned long sampleMask = 0xFFFFFFFF;
Expand Down Expand Up @@ -1424,7 +1424,7 @@ dictionary GPUStencilStateFaceDescriptor {
};
</script>

### Vertex Input ### {#vertex-input}
### Vertex State ### {#vertex-state}

<script type=idl>
enum GPUIndexFormat {
Expand Down Expand Up @@ -1494,29 +1494,42 @@ enum GPUInputStepMode {
</script>

<script type=idl>
dictionary GPUVertexAttributeDescriptor {
GPUBufferSize offset = 0;
required GPUVertexFormat format;
required unsigned long shaderLocation;
dictionary GPUVertexStateDescriptor {
GPUIndexFormat indexFormat = "uint32";
sequence<GPUVertexBufferLayoutDescriptor?> vertexBuffers = [];
};
</script>

A <dfn dfn>vertex buffer</dfn> is, conceptually, a view into buffer memory as an *array of structures*.
{{GPUVertexBufferLayoutDescriptor/arrayStride}} is the stride, in bytes, between *elements* of that array.
Each element of a vertex buffer is like a *structure* with a memory layout defined by its
{{GPUVertexBufferLayoutDescriptor/attributes}}, which describe the *members* of the structure.

Each {{GPUVertexAttributeDescriptor}} describes its
{{GPUVertexAttributeDescriptor/format}} and its
{{GPUVertexAttributeDescriptor/offset}}, in bytes, within the structure.

Each attribute appears as a separate input in a vertex shader, each bound by a numeric *location*,
which is specified by {{GPUVertexAttributeDescriptor/shaderLocation}}.
Every location must be unique within the {{GPUVertexStateDescriptor}}.

<script type=idl>
dictionary GPUVertexBufferDescriptor {
required GPUBufferSize stride;
dictionary GPUVertexBufferLayoutDescriptor {
required GPUBufferSize arrayStride;
GPUInputStepMode stepMode = "vertex";
required sequence<GPUVertexAttributeDescriptor> attributeSet;
required sequence<GPUVertexAttributeDescriptor> attributes;
};
</script>

<script type=idl>
dictionary GPUVertexInputDescriptor {
GPUIndexFormat indexFormat = "uint32";
sequence<GPUVertexBufferDescriptor?> vertexBuffers = [];
dictionary GPUVertexAttributeDescriptor {
required GPUVertexFormat format;
required GPUBufferSize offset;

required unsigned long shaderLocation;
};
</script>


Command Buffers {#command-buffers}
==================================

Expand Down Expand Up @@ -1959,3 +1972,5 @@ partial interface GPUDevice {
# Temporary usages of non-exported dfns ## {#temp-dfn-usages}

Eventually all of these should disappear but they are useful to avoid warning while building the specification.

[=vertex buffer=]