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Add new texel buffer type.

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GLSL 3+ shaders can read from texel buffers by declaring a uniform samplerBuffer variable and calling texelFetch with a 0-based index, in the shader code. All attributes in a texel buffer's format array must have the same data format (e.g. all 'floatvec4' formats).

Shader:send accepts a texel Buffer for samplerBuffer uniforms.

Added 'texelbuffer' to love.graphics.getSupported (requires GLSL 3+ and desktop OpenGL).
Added 'texelbuffersize' to love.graphics.getSystemLimits. Returns the max number of values in a texel buffer (array length multiplied by the number of attributes declared in the buffer's format array).
This commit is contained in:
Alex Szpakowski
2020-07-28 20:44:36 -03:00
parent 3c65d5ae41
commit b011487a3e
18 changed files with 445 additions and 62 deletions
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src/modules/graphics/Buffer.cpp
+38 -3
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@@ -43,13 +43,18 @@ Buffer::Buffer(Graphics *gfx, const Settings &settings, const std::vector<DataDe
if (bufferformat.size() == 0)
throw love::Exception("Data format must contain values.");
bool supportsGLSL3 = gfx->getCapabilities().features[Graphics::FEATURE_GLSL3];
const auto &caps = gfx->getCapabilities();
bool supportsGLSL3 = caps.features[Graphics::FEATURE_GLSL3];
bool indexbuffer = settings.typeFlags & TYPEFLAG_INDEX;
bool vertexbuffer = settings.typeFlags & TYPEFLAG_VERTEX;
bool texelbuffer = settings.typeFlags & TYPEFLAG_TEXEL;
if (!indexbuffer && !vertexbuffer)
throw love::Exception("Buffer must be created with at least one buffer type (index or vertex).");
if (!indexbuffer && !vertexbuffer && !texelbuffer)
throw love::Exception("Buffer must be created with at least one buffer type (index, vertex, or texel).");
if (texelbuffer && !caps.features[Graphics::FEATURE_TEXEL_BUFFER])
throw love::Exception("Texel buffers are not supported on this system.");
size_t offset = 0;
size_t stride = 0;
@@ -68,6 +73,9 @@ Buffer::Buffer(Graphics *gfx, const Settings &settings, const std::vector<DataDe
if (bufferformat.size() > 1)
throw love::Exception("Index buffers only support a single value per element.");
if (decl.arrayLength > 0)
throw love::Exception("Arrays are not supported in index buffers.");
}
if (vertexbuffer)
@@ -83,6 +91,30 @@ Buffer::Buffer(Graphics *gfx, const Settings &settings, const std::vector<DataDe
if ((info.baseType == DATA_BASETYPE_INT || info.baseType == DATA_BASETYPE_UINT) && !supportsGLSL3)
throw love::Exception("Integer vertex attribute data types require GLSL 3 support.");
if (decl.name.empty())
throw love::Exception("Vertex buffer attributes must have a name.");
}
if (texelbuffer)
{
if (format != bufferformat[0].format)
throw love::Exception("All values in a texel buffer must have the same format.");
if (decl.arrayLength > 0)
throw love::Exception("Arrays are not supported in texel buffers.");
if (info.isMatrix)
throw love::Exception("Matrix types are not supported in texel buffers.");
if (info.baseType == DATA_BASETYPE_BOOL)
throw love::Exception("Bool types are not supported in texel buffers.");
if (info.components == 3)
throw love::Exception("3-component formats are not supported in texel buffers.");
if (info.baseType == DATA_BASETYPE_SNORM)
throw love::Exception("Signed normalized formats are not supported in texel buffers.");
}
// TODO: alignment
@@ -111,6 +143,9 @@ Buffer::Buffer(Graphics *gfx, const Settings &settings, const std::vector<DataDe
this->arrayStride = stride;
this->arrayLength = arraylength;
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]);
}
Buffer::~Buffer()