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filter-blur: Faster initialization for Gaussian Blur

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Xaymar 2017-10-22 19:04:41 +02:00
parent b266af1044
commit c0aa79abbe
1 changed files with 18 additions and 22 deletions
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40
source/filter-blur.cpp
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@ -49,11 +49,10 @@ static size_t g_maxKernelSize = 25;
const double_t pi = 3.1415926535897932384626433832795; const double_t pi = 3.1415926535897932384626433832795;
const double_t twopi = 6.283185307179586476925286766559; const double_t twopi = 6.283185307179586476925286766559;
const double_t twopisqr = 2.506628274631000502415765284811; const double_t twopisqr = 2.506628274631000502415765284811;
const double_t half = 0.5;
double_t gaussian1D(double_t x, double_t o) { double_t gaussian1D(double_t x, double_t o) {
double_t c = (x / o); double_t c = (x / o);
double_t b = exp(-half * c * c); double_t b = exp(-0.5 * c * c);
double_t a = (1.0 / (o * twopisqr)); double_t a = (1.0 / (o * twopisqr));
return a * b; return a * b;
} }
@ -64,38 +63,35 @@ double_t bilateral(double_t x, double_t o) {
static void makeGaussianKernels() { static void makeGaussianKernels() {
g_gaussianBlur.kernels.resize(g_maxKernelSize); g_gaussianBlur.kernels.resize(g_maxKernelSize);
std::vector<float_t> textureBuffer;
std::vector<double_t> mathBuffer; std::vector<double_t> mathBuffer;
std::vector<float_t> textureBuffer;
for (size_t n = 1; n <= g_maxKernelSize; n++) { for (size_t n = 1; n <= g_maxKernelSize; n++) {
textureBuffer.resize(n * 4); size_t width = n + 1;
mathBuffer.resize(n); mathBuffer.resize(width);
textureBuffer.resize(width);
// Calculate and normalize // Calculate
double_t sum = 0.0; double_t gaussianSum = 0.0;
for (size_t p = 0; p < n; p++) { for (size_t p = 0; p < width; p++) {
double_t g = gaussian1D(double_t(p), double_t(n)); double_t g = gaussian1D(double_t(p), double_t(n));
mathBuffer[p] = g; mathBuffer[p] = g;
sum += g; gaussianSum += g;
if (p != 0) if (p != 0)
sum += g; gaussianSum += g;
}
for (size_t p = 0; p < n; p++) {
mathBuffer[p] /= sum;
} }
// Build Texture // Normalize
for (size_t p = 0; p < n; p++) { double_t gaussianMult = 1.0 / gaussianSum;
textureBuffer[p * 4] = for (size_t p = 0; p < width; p++) {
textureBuffer[p * 4 + 1] = textureBuffer[p] = (float_t)(mathBuffer[p] * gaussianMult);
textureBuffer[p * 4 + 2] =
textureBuffer[p * 4 + 3] = (float_t)mathBuffer[p];
} }
// Create Texture
uint8_t* data = reinterpret_cast<uint8_t*>(textureBuffer.data()); uint8_t* data = reinterpret_cast<uint8_t*>(textureBuffer.data());
const uint8_t** pdata = const_cast<const uint8_t**>(&data); const uint8_t** pdata = const_cast<const uint8_t**>(&data);
gs_texture_t* tex = gs_texture_create(uint32_t(n), 1, gs_color_format::GS_RGBA32F, 1, pdata, 0); gs_texture_t* tex = gs_texture_create(uint32_t(width), 1, gs_color_format::GS_R32F, 1, pdata, 0);
if (!tex) { if (!tex) {
P_LOG_ERROR("<filter-blur> Failed to create gaussian kernel for %d width.", n); P_LOG_ERROR("<filter-blur> Failed to create gaussian kernel for %d width.", n);
} else { } else {
@ -240,7 +236,7 @@ obs_properties_t * Filter::Blur::get_properties(void *) {
p = obs_properties_add_int_slider(pr, S_FILTER_BLUR_SIZE, p = obs_properties_add_int_slider(pr, S_FILTER_BLUR_SIZE,
P_TRANSLATE(S_FILTER_BLUR_SIZE), 1, 25, 1); P_TRANSLATE(S_FILTER_BLUR_SIZE), 1, 25, 1);
obs_property_set_long_description(p, P_TRANSLATE(P_DESC(S_FILTER_BLUR_SIZE))); obs_property_set_long_description(p, P_TRANSLATE(P_DESC(S_FILTER_BLUR_SIZE)));
obs_property_set_modified_callback(p, modified_properties); //obs_property_set_modified_callback(p, modified_properties);
// Bilateral Only // Bilateral Only
p = obs_properties_add_float_slider(pr, S_FILTER_BLUR_BILATERAL_SMOOTHING, p = obs_properties_add_float_slider(pr, S_FILTER_BLUR_BILATERAL_SMOOTHING,
@ -627,7 +623,7 @@ bool Filter::Blur::Instance::apply_shared_param(gs_texture_t* input, float texel
vec2 imageTexelDelta; vec2 imageTexelDelta;
vec2_set(&imageTexelDelta, 1.0f, 1.0f); vec2_set(&imageTexelDelta, 1.0f, 1.0f);
vec2_div(&imageTexelDelta, &imageTexelDelta, &imageSize); vec2_div(&imageTexelDelta, &imageTexelDelta, &imageSize);
result = result && gs_set_param_float2(m_effect, "u_imageTexelDelta", &imageTexelDelta); result = result && gs_set_param_float2(m_effect, "u_imageTexel", &imageTexelDelta);
vec2 texel; vec2_set(&texel, texelX, texelY); vec2 texel; vec2_set(&texel, texelX, texelY);
result = result && gs_set_param_float2(m_effect, "u_texelDelta", &texel); result = result && gs_set_param_float2(m_effect, "u_texelDelta", &texel);