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Implement unorm_rgba8 and unorm_rg8 vertex formats.

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Backend support implemented in GL, Metal and D3D12.
Support for unorm values in the GL backend requires a
utility function to indicate if the format's components
are normalized.

Note that unorm_r8 is only supported on more recent MacOS SDKs (10.13),
so it's omitted for now.
This commit is contained in:
Stephen White
2018-02-04 08:49:43 -05:00
committed by Corentin Wallez
parent 33dfd0a78f
commit 8d742d1375
7 changed files with 45 additions and 4 deletions
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21
src/backend/opengl/CommandBufferGL.cpp
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@@ -49,6 +49,24 @@ namespace backend { namespace opengl {
case nxt::VertexFormat::FloatR32G32:
case nxt::VertexFormat::FloatR32:
return GL_FLOAT;
case nxt::VertexFormat::UnormR8G8B8A8:
case nxt::VertexFormat::UnormR8G8:
return GL_UNSIGNED_BYTE;
default:
UNREACHABLE();
}
}
GLboolean VertexFormatIsNormalized(nxt::VertexFormat format) {
switch (format) {
case nxt::VertexFormat::FloatR32G32B32A32:
case nxt::VertexFormat::FloatR32G32B32:
case nxt::VertexFormat::FloatR32G32:
case nxt::VertexFormat::FloatR32:
return GL_FALSE;
case nxt::VertexFormat::UnormR8G8B8A8:
case nxt::VertexFormat::UnormR8G8:
return GL_TRUE;
default:
UNREACHABLE();
}
@@ -184,9 +202,10 @@ namespace backend { namespace opengl {
auto components = VertexFormatNumComponents(attribute.format);
auto formatType = VertexFormatType(attribute.format);
GLboolean normalized = VertexFormatIsNormalized(attribute.format);
glBindBuffer(GL_ARRAY_BUFFER, buffer);
glVertexAttribPointer(
location, components, formatType, GL_FALSE, input.stride,
location, components, formatType, normalized, input.stride,
reinterpret_cast<void*>(
static_cast<intptr_t>(offset + attribute.offset)));
}