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Graphics Buffers can be used as Shader Storage Buffers.

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This commit is contained in:
Alex Szpakowski
2021-01-10 17:53:12 -04:00
parent 6fede802b3
commit 50ff86bd92
15 changed files with 451 additions and 68 deletions
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src/modules/graphics/Buffer.cpp
+59 -8
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@@ -20,6 +20,7 @@
#include "Buffer.h"
#include "Graphics.h"
#include "common/memory.h"
namespace love
{
@@ -48,15 +49,20 @@ Buffer::Buffer(Graphics *gfx, const Settings &settings, const std::vector<DataDe
bool indexbuffer = settings.typeFlags & TYPEFLAG_INDEX;
bool vertexbuffer = settings.typeFlags & TYPEFLAG_VERTEX;
bool texelbuffer = settings.typeFlags & TYPEFLAG_TEXEL;
bool storagebuffer = settings.typeFlags & TYPEFLAG_SHADER_STORAGE;
if (!indexbuffer && !vertexbuffer && !texelbuffer)
throw love::Exception("Buffer must be created with at least one buffer type (index, vertex, or texel).");
if (!indexbuffer && !vertexbuffer && !texelbuffer && !storagebuffer)
throw love::Exception("Buffer must be created with at least one buffer type (index, vertex, texel, or shaderstorage).");
if (texelbuffer && !caps.features[Graphics::FEATURE_TEXEL_BUFFER])
throw love::Exception("Texel buffers are not supported on this system.");
if (storagebuffer && !caps.features[Graphics::FEATURE_GLSL4])
throw love::Exception("Shader Storage buffers are not supported on this system (GLSL 4 support is necessary.)");
size_t offset = 0;
size_t stride = 0;
size_t structurealignment = 1;
for (const DataDeclaration &decl : bufferformat)
{
@@ -116,16 +122,60 @@ Buffer::Buffer(Graphics *gfx, const Settings &settings, const std::vector<DataDe
throw love::Exception("Signed normalized formats are not supported in texel buffers.");
}
// TODO: alignment
member.offset = offset;
member.size = member.info.size;
size_t memberoffset = offset;
size_t membersize = member.info.size;
offset += member.size;
// Storage buffers are always treated as being an array of a structure.
// The structure's contents are the buffer format declaration.
if (storagebuffer)
{
// TODO: We can support these.
if (decl.arrayLength > 0)
throw love::Exception("Arrays are not currently supported in shader storage buffers.");
if (info.baseType == DATA_BASETYPE_BOOL)
throw love::Exception("Bool types are not supported in shader storage buffers.");
if (info.baseType == DATA_BASETYPE_UNORM || info.baseType == DATA_BASETYPE_SNORM)
throw love::Exception("Normalized formats are not supported in shader storage buffers.");
size_t alignment = 1;
// GLSL's std430 packing rules. We also assume all matrices are
// column-major.
if (info.isMatrix)
alignment = info.matrixRows * info.componentSize;
else
alignment = info.components * info.componentSize;
structurealignment = std::max(structurealignment, alignment);
memberoffset = alignUp(memberoffset, alignment);
if (memberoffset != offset && (indexbuffer || vertexbuffer || texelbuffer))
throw love::Exception("Cannot create Buffer:\nInternal alignment of member '%s' is preventing Buffer from being created as both a shader storage buffer and other buffer types\nMember byte offset needed for shader storage buffer: %d\nMember byte offset needed for other buffer types: %d",
member.decl.name.c_str(), memberoffset, offset);
}
member.offset = memberoffset;
member.size = membersize;
offset = member.offset + member.size;
dataMembers.push_back(member);
}
stride = offset;
stride = alignUp(offset, structurealignment);
if (storagebuffer && (indexbuffer || vertexbuffer || texelbuffer))
{
if (stride != offset)
throw love::Exception("Cannot create Buffer:\nBuffer used as a shader storage buffer would have a different number of bytes per array element (%d) than when used as other buffer types (%d)",
stride, offset);
}
if (storagebuffer && stride > SHADER_STORAGE_BUFFER_MAX_STRIDE)
throw love::Exception("Shader storage buffers cannot have more than %d bytes within each array element.", SHADER_STORAGE_BUFFER_MAX_STRIDE);
if (size != 0)
{
@@ -144,7 +194,8 @@ Buffer::Buffer(Graphics *gfx, const Settings &settings, const std::vector<DataDe
this->size = size;
if (texelbuffer && arraylength * dataMembers.size() > caps.limits[Graphics::LIMIT_TEXEL_BUFFER_SIZE])
throw love::Exception("Cannot create texel buffer: total number of values in the buffer (%d * %d) is too large for this system (maximum %d).", (int) dataMembers.size(), (int) arraylength, caps.limits[Graphics::LIMIT_TEXEL_BUFFER_SIZE]);
throw love::Exception("Cannot create texel buffer: total number of values in the buffer (%d * %d) is too large for this system (maximum %d).",
(int) dataMembers.size(), (int) arraylength, caps.limits[Graphics::LIMIT_TEXEL_BUFFER_SIZE]);
}
Buffer::~Buffer()