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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/opengl/Graphics.cpp
+26 -2
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@@ -91,6 +91,7 @@ static GLenum getGLBlendFactor(BlendFactor factor)
Graphics::Graphics()
: windowHasStencil(false)
, mainVAO(0)
, defaultBuffers()
, supportedFormats()
{
gl = OpenGL();
@@ -243,6 +244,27 @@ bool Graphics::setMode(int width, int height, int pixelwidth, int pixelheight, b
batchedDrawState.indexBuffer = CreateStreamBuffer(BUFFERTYPE_INDEX, sizeof(uint16) * LOVE_UINT16_MAX);
}
if (capabilities.features[FEATURE_TEXEL_BUFFER] && defaultBuffers[BUFFERTYPE_TEXEL].get() == nullptr)
{
Buffer::Settings settings(Buffer::TYPEFLAG_TEXEL, 0, BUFFERUSAGE_STATIC);
std::vector<Buffer::DataDeclaration> format = {{"", DATAFORMAT_FLOAT_VEC4, 0}};
const float texel[] = {0.0f, 0.0f, 0.0f, 1.0f};
love::graphics::Buffer *buffer = newBuffer(settings, format, texel, sizeof(texel), 1);
defaultBuffers[BUFFERTYPE_TEXEL].set(buffer, Acquire::NORETAIN);
}
// Load default resources before other Volatile.
for (int i = 0; i < BUFFERTYPE_MAX_ENUM; i++)
{
if (defaultBuffers[i].get())
((Buffer *) defaultBuffers[i].get())->loadVolatile();
}
if (defaultBuffers[BUFFERTYPE_TEXEL].get())
gl.setDefaultTexelBuffer((GLuint) defaultBuffers[BUFFERTYPE_TEXEL]->getTexelBufferHandle());
// Reload all volatile objects.
if (!Volatile::loadAll())
::printf("Could not reload all volatile objects.\n");
@@ -1366,17 +1388,19 @@ void Graphics::initCapabilities()
capabilities.features[FEATURE_GLSL3] = GLAD_ES_VERSION_3_0 || gl.isCoreProfile();
capabilities.features[FEATURE_GLSL4] = GLAD_ES_VERSION_3_1 || (gl.isCoreProfile() && GLAD_VERSION_4_3);
capabilities.features[FEATURE_INSTANCING] = gl.isInstancingSupported();
static_assert(FEATURE_MAX_ENUM == 10, "Graphics::initCapabilities must be updated when adding a new graphics feature!");
capabilities.features[FEATURE_TEXEL_BUFFER] = gl.areTexelBuffersSupported();
static_assert(FEATURE_MAX_ENUM == 11, "Graphics::initCapabilities must be updated when adding a new graphics feature!");
capabilities.limits[LIMIT_POINT_SIZE] = gl.getMaxPointSize();
capabilities.limits[LIMIT_TEXTURE_SIZE] = gl.getMax2DTextureSize();
capabilities.limits[LIMIT_TEXTURE_LAYERS] = gl.getMaxTextureLayers();
capabilities.limits[LIMIT_VOLUME_TEXTURE_SIZE] = gl.getMax3DTextureSize();
capabilities.limits[LIMIT_CUBE_TEXTURE_SIZE] = gl.getMaxCubeTextureSize();
capabilities.limits[LIMIT_TEXEL_BUFFER_SIZE] = gl.getMaxTexelBufferSize();
capabilities.limits[LIMIT_RENDER_TARGETS] = gl.getMaxRenderTargets();
capabilities.limits[LIMIT_TEXTURE_MSAA] = gl.getMaxSamples();
capabilities.limits[LIMIT_ANISOTROPY] = gl.getMaxAnisotropy();
static_assert(LIMIT_MAX_ENUM == 8, "Graphics::initCapabilities must be updated when adding a new system limit!");
static_assert(LIMIT_MAX_ENUM == 9, "Graphics::initCapabilities must be updated when adding a new system limit!");
for (int i = 0; i < TEXTURE_MAX_ENUM; i++)
capabilities.textureTypes[i] = gl.isTextureTypeSupported((TextureType) i);