// Three-lobed Lanczos, the most common choice.
+// Note that if you change this, the accuracy for LANCZOS_TABLE_SIZE
+// needs to be recomputed.
#define LANCZOS_RADIUS 3.0
-#include <math.h>
+#include <epoxy/gl.h>
#include <assert.h>
+#include <limits.h>
+#include <math.h>
+#include <stdio.h>
+#include <algorithm>
+#include <Eigen/Sparse>
+#include <Eigen/SparseQR>
+#include <Eigen/OrderingMethods>
-#include "resample_effect.h"
#include "effect_chain.h"
+#include "effect_util.h"
+#include "fp16.h"
+#include "init.h"
+#include "resample_effect.h"
#include "util.h"
-#include "opengl.h"
+
+using namespace Eigen;
+using namespace std;
+
+namespace movit {
namespace {
+template<class T>
+struct Tap {
+ T weight;
+ T pos;
+};
+
float sinc(float x)
{
if (fabs(x) < 1e-6) {
}
}
-float lanczos_weight(float x, float a)
+float lanczos_weight(float x)
{
- if (fabs(x) > a) {
+ if (fabs(x) > LANCZOS_RADIUS) {
return 0.0f;
} else {
- return sinc(M_PI * x) * sinc(M_PI * x / a);
+ return sinc(M_PI * x) * sinc((M_PI / LANCZOS_RADIUS) * x);
+ }
+}
+
+// The weight function can be expensive to compute over and over again
+// (which will happen during e.g. a zoom), but it is also easy to interpolate
+// linearly. We compute the right half of the function (in the range of
+// 0..LANCZOS_RADIUS), with two guard elements for easier interpolation, and
+// linearly interpolate to get our function.
+//
+// We want to scale the table so that the maximum error is always smaller
+// than 1e-6. As per http://www-solar.mcs.st-andrews.ac.uk/~clare/Lectures/num-analysis/Numan_chap3.pdf,
+// the error for interpolating a function linearly between points [a,b] is
+//
+// e = 1/2 (x-a)(x-b) f''(u_x)
+//
+// for some point u_x in [a,b] (where f(x) is our Lanczos function; we're
+// assuming LANCZOS_RADIUS=3 from here on). Obviously this is bounded by
+// f''(x) over the entire range. Numeric optimization shows the maximum of
+// |f''(x)| to be in x=1.09369819474562880, with the value 2.40067758733152381.
+// So if the steps between consecutive values are called d, we get
+//
+// |e| <= 1/2 (d/2)^2 2.4007
+// |e| <= 0.1367 d^2
+//
+// Solve for e = 1e-6 yields a step size of 0.0027, which to cover the range
+// 0..3 needs 1109 steps. We round up to the next power of two, just to be sure.
+//
+// You need to call lanczos_table_init_done before the first call to
+// lanczos_weight_cached.
+#define LANCZOS_TABLE_SIZE 2048
+bool lanczos_table_init_done = false;
+float lanczos_table[LANCZOS_TABLE_SIZE + 2];
+
+void init_lanczos_table()
+{
+ for (unsigned i = 0; i < LANCZOS_TABLE_SIZE + 2; ++i) {
+ lanczos_table[i] = lanczos_weight(float(i) * (LANCZOS_RADIUS / LANCZOS_TABLE_SIZE));
+ }
+ lanczos_table_init_done = true;
+}
+
+float lanczos_weight_cached(float x)
+{
+ x = fabs(x);
+ if (x > LANCZOS_RADIUS) {
+ return 0.0f;
}
+ float table_pos = x * (LANCZOS_TABLE_SIZE / LANCZOS_RADIUS);
+ int table_pos_int = int(table_pos); // Truncate towards zero.
+ float table_pos_frac = table_pos - table_pos_int;
+ assert(table_pos < LANCZOS_TABLE_SIZE + 2);
+ return lanczos_table[table_pos_int] +
+ table_pos_frac * (lanczos_table[table_pos_int + 1] - lanczos_table[table_pos_int]);
}
// Euclid's algorithm, from Wikipedia.
return a;
}
-unsigned combine_samples(float *src, float *dst, unsigned num_src_samples, unsigned max_samples_saved)
+template<class DestFloat>
+unsigned combine_samples(const Tap<float> *src, Tap<DestFloat> *dst, float num_subtexels, float inv_num_subtexels, unsigned num_src_samples, unsigned max_samples_saved)
{
+ // Cut off near-zero values at both sides.
unsigned num_samples_saved = 0;
+ while (num_samples_saved < max_samples_saved &&
+ num_src_samples > 0 &&
+ fabs(src[0].weight) < 1e-6) {
+ ++src;
+ --num_src_samples;
+ ++num_samples_saved;
+ }
+ while (num_samples_saved < max_samples_saved &&
+ num_src_samples > 0 &&
+ fabs(src[num_src_samples - 1].weight) < 1e-6) {
+ --num_src_samples;
+ ++num_samples_saved;
+ }
+
for (unsigned i = 0, j = 0; i < num_src_samples; ++i, ++j) {
// Copy the sample directly; it will be overwritten later if we can combine.
if (dst != NULL) {
- dst[j * 2 + 0] = src[i * 2 + 0];
- dst[j * 2 + 1] = src[i * 2 + 1];
+ dst[j].weight = convert_float<float, DestFloat>(src[i].weight);
+ dst[j].pos = convert_float<float, DestFloat>(src[i].pos);
}
if (i == num_src_samples - 1) {
// Last sample; cannot combine.
continue;
}
+ assert(num_samples_saved <= max_samples_saved);
if (num_samples_saved == max_samples_saved) {
// We could maybe save more here, but other rows can't, so don't bother.
continue;
}
- float w1 = src[i * 2 + 0];
- float w2 = src[(i + 1) * 2 + 0];
+ float w1 = src[i].weight;
+ float w2 = src[i + 1].weight;
if (w1 * w2 < 0.0f) {
// Differing signs; cannot combine.
continue;
}
- float pos1 = src[i * 2 + 1];
- float pos2 = src[(i + 1) * 2 + 1];
+ float pos1 = src[i].pos;
+ float pos2 = src[i + 1].pos;
assert(pos2 > pos1);
- float offset, total_weight;
- combine_two_samples(w1, w2, &offset, &total_weight);
+ DestFloat pos, total_weight;
+ float sum_sq_error;
+ combine_two_samples(w1, w2, pos1, pos2, num_subtexels, inv_num_subtexels, &pos, &total_weight, &sum_sq_error);
+
+ // If the interpolation error is larger than that of about sqrt(2) of
+ // a level at 8-bit precision, don't combine. (You'd think 1.0 was enough,
+ // but since the artifacts are not really random, they can get quite
+ // visible. On the other hand, going to 0.25f, I can see no change at
+ // all with 8-bit output, so it would not seem to be worth it.)
+ if (sum_sq_error > 0.5f / (255.0f * 255.0f)) {
+ continue;
+ }
// OK, we can combine this and the next sample.
if (dst != NULL) {
- dst[j * 2 + 0] = total_weight;
- dst[j * 2 + 1] = pos1 + offset * (pos2 - pos1);
+ dst[j].weight = total_weight;
+ dst[j].pos = pos;
}
++i; // Skip the next sample.
return num_samples_saved;
}
+// Normalize so that the sum becomes one. Note that we do it twice;
+// this sometimes helps a tiny little bit when we have many samples.
+template<class T>
+void normalize_sum(Tap<T>* vals, unsigned num)
+{
+ for (int normalize_pass = 0; normalize_pass < 2; ++normalize_pass) {
+ float sum = 0.0;
+ for (unsigned i = 0; i < num; ++i) {
+ sum += to_fp32(vals[i].weight);
+ }
+ float inv_sum = 1.0 / sum;
+ for (unsigned i = 0; i < num; ++i) {
+ vals[i].weight = from_fp32<T>(to_fp32(vals[i].weight) * inv_sum);
+ }
+ }
+}
+
+// Make use of the bilinear filtering in the GPU to reduce the number of samples
+// we need to make. This is a bit more complex than BlurEffect since we cannot combine
+// two neighboring samples if their weights have differing signs, so we first need to
+// figure out the maximum number of samples. Then, we downconvert all the weights to
+// that number -- we could have gone for a variable-length system, but this is simpler,
+// and the gains would probably be offset by the extra cost of checking when to stop.
+//
+// The greedy strategy for combining samples is optimal.
+template<class DestFloat>
+unsigned combine_many_samples(const Tap<float> *weights, unsigned src_size, unsigned src_samples, unsigned dst_samples, Tap<DestFloat> **bilinear_weights)
+{
+ float num_subtexels = src_size / movit_texel_subpixel_precision;
+ float inv_num_subtexels = movit_texel_subpixel_precision / src_size;
+
+ unsigned max_samples_saved = UINT_MAX;
+ for (unsigned y = 0; y < dst_samples && max_samples_saved > 0; ++y) {
+ unsigned num_samples_saved = combine_samples<DestFloat>(weights + y * src_samples, NULL, num_subtexels, inv_num_subtexels, src_samples, max_samples_saved);
+ max_samples_saved = min(max_samples_saved, num_samples_saved);
+ }
+
+ // Now that we know the right width, actually combine the samples.
+ unsigned src_bilinear_samples = src_samples - max_samples_saved;
+ *bilinear_weights = new Tap<DestFloat>[dst_samples * src_bilinear_samples];
+ for (unsigned y = 0; y < dst_samples; ++y) {
+ Tap<DestFloat> *bilinear_weights_ptr = *bilinear_weights + y * src_bilinear_samples;
+ unsigned num_samples_saved = combine_samples(
+ weights + y * src_samples,
+ bilinear_weights_ptr,
+ num_subtexels,
+ inv_num_subtexels,
+ src_samples,
+ max_samples_saved);
+ assert(num_samples_saved == max_samples_saved);
+ normalize_sum(bilinear_weights_ptr, src_bilinear_samples);
+ }
+ return src_bilinear_samples;
+}
+
+// Compute the sum of squared errors between the ideal weights (which are
+// assumed to fall exactly on pixel centers) and the weights that result
+// from sampling at <bilinear_weights>. The primary reason for the difference
+// is inaccuracy in the sampling positions, both due to limited precision
+// in storing them (already inherent in sending them in as fp16_int_t)
+// and in subtexel sampling precision (which we calculate in this function).
+template<class T>
+double compute_sum_sq_error(const Tap<float>* weights, unsigned num_weights,
+ const Tap<T>* bilinear_weights, unsigned num_bilinear_weights,
+ unsigned size)
+{
+ // Find the effective range of the bilinear-optimized kernel.
+ // Due to rounding of the positions, this is not necessarily the same
+ // as the intended range (ie., the range of the original weights).
+ int lower_pos = int(floor(to_fp32(bilinear_weights[0].pos) * size - 0.5));
+ int upper_pos = int(ceil(to_fp32(bilinear_weights[num_bilinear_weights - 1].pos) * size - 0.5)) + 2;
+ lower_pos = min<int>(lower_pos, lrintf(weights[0].pos * size - 0.5));
+ upper_pos = max<int>(upper_pos, lrintf(weights[num_weights - 1].pos * size - 0.5) + 1);
+
+ float* effective_weights = new float[upper_pos - lower_pos];
+ for (int i = 0; i < upper_pos - lower_pos; ++i) {
+ effective_weights[i] = 0.0f;
+ }
+
+ // Now find the effective weights that result from this sampling.
+ for (unsigned i = 0; i < num_bilinear_weights; ++i) {
+ const float pixel_pos = to_fp32(bilinear_weights[i].pos) * size - 0.5f;
+ const int x0 = int(floor(pixel_pos)) - lower_pos;
+ const int x1 = x0 + 1;
+ const float f = lrintf((pixel_pos - (x0 + lower_pos)) / movit_texel_subpixel_precision) * movit_texel_subpixel_precision;
+
+ assert(x0 >= 0);
+ assert(x1 >= 0);
+ assert(x0 < upper_pos - lower_pos);
+ assert(x1 < upper_pos - lower_pos);
+
+ effective_weights[x0] += to_fp32(bilinear_weights[i].weight) * (1.0 - f);
+ effective_weights[x1] += to_fp32(bilinear_weights[i].weight) * f;
+ }
+
+ // Subtract the desired weights to get the error.
+ for (unsigned i = 0; i < num_weights; ++i) {
+ const int x = lrintf(weights[i].pos * size - 0.5f) - lower_pos;
+ assert(x >= 0);
+ assert(x < upper_pos - lower_pos);
+
+ effective_weights[x] -= weights[i].weight;
+ }
+
+ double sum_sq_error = 0.0;
+ for (unsigned i = 0; i < num_weights; ++i) {
+ sum_sq_error += effective_weights[i] * effective_weights[i];
+ }
+
+ delete[] effective_weights;
+ return sum_sq_error;
+}
+
} // namespace
ResampleEffect::ResampleEffect()
: input_width(1280),
- input_height(720)
+ input_height(720),
+ offset_x(0.0f), offset_y(0.0f),
+ zoom_x(1.0f), zoom_y(1.0f),
+ zoom_center_x(0.5f), zoom_center_y(0.5f)
{
register_int("width", &output_width);
register_int("height", &output_height);
// The first blur pass will forward resolution information to us.
hpass = new SingleResamplePassEffect(this);
- hpass->set_int("direction", SingleResamplePassEffect::HORIZONTAL);
+ CHECK(hpass->set_int("direction", SingleResamplePassEffect::HORIZONTAL));
vpass = new SingleResamplePassEffect(NULL);
- vpass->set_int("direction", SingleResamplePassEffect::VERTICAL);
+ CHECK(vpass->set_int("direction", SingleResamplePassEffect::VERTICAL));
update_size();
}
input_height = height;
update_size();
}
-
+
void ResampleEffect::update_size()
{
bool ok = true;
ok |= vpass->set_int("output_height", output_height);
assert(ok);
+
+ // The offset added due to zoom may have changed with the size.
+ update_offset_and_zoom();
}
-bool ResampleEffect::set_float(const std::string &key, float value) {
+void ResampleEffect::update_offset_and_zoom()
+{
+ bool ok = true;
+
+ // Zoom from the right origin. (zoom_center is given in normalized coordinates,
+ // i.e. 0..1.)
+ float extra_offset_x = zoom_center_x * (1.0f - 1.0f / zoom_x) * input_width;
+ float extra_offset_y = (1.0f - zoom_center_y) * (1.0f - 1.0f / zoom_y) * input_height;
+
+ ok |= hpass->set_float("offset", extra_offset_x + offset_x);
+ ok |= vpass->set_float("offset", extra_offset_y - offset_y); // Compensate for the bottom-left origin.
+ ok |= hpass->set_float("zoom", zoom_x);
+ ok |= vpass->set_float("zoom", zoom_y);
+
+ assert(ok);
+}
+
+bool ResampleEffect::set_float(const string &key, float value) {
if (key == "width") {
output_width = value;
update_size();
update_size();
return true;
}
+ if (key == "top") {
+ offset_y = value;
+ update_offset_and_zoom();
+ return true;
+ }
+ if (key == "left") {
+ offset_x = value;
+ update_offset_and_zoom();
+ return true;
+ }
+ if (key == "zoom_x") {
+ if (value <= 0.0f) {
+ return false;
+ }
+ zoom_x = value;
+ update_offset_and_zoom();
+ return true;
+ }
+ if (key == "zoom_y") {
+ if (value <= 0.0f) {
+ return false;
+ }
+ zoom_y = value;
+ update_offset_and_zoom();
+ return true;
+ }
+ if (key == "zoom_center_x") {
+ zoom_center_x = value;
+ update_offset_and_zoom();
+ return true;
+ }
+ if (key == "zoom_center_y") {
+ zoom_center_y = value;
+ update_offset_and_zoom();
+ return true;
+ }
return false;
}
direction(HORIZONTAL),
input_width(1280),
input_height(720),
+ offset(0.0),
+ zoom(1.0),
last_input_width(-1),
last_input_height(-1),
last_output_width(-1),
- last_output_height(-1)
+ last_output_height(-1),
+ last_offset(0.0 / 0.0), // NaN.
+ last_zoom(0.0 / 0.0), // NaN.
+ last_texture_width(-1), last_texture_height(-1)
{
register_int("direction", (int *)&direction);
register_int("input_width", &input_width);
register_int("input_height", &input_height);
register_int("output_width", &output_width);
register_int("output_height", &output_height);
+ register_float("offset", &offset);
+ register_float("zoom", &zoom);
+ register_uniform_sampler2d("sample_tex", &uniform_sample_tex);
+ register_uniform_int("num_samples", &uniform_num_samples);
+ register_uniform_float("num_loops", &uniform_num_loops);
+ register_uniform_float("slice_height", &uniform_slice_height);
+ register_uniform_float("sample_x_scale", &uniform_sample_x_scale);
+ register_uniform_float("sample_x_offset", &uniform_sample_x_offset);
+ register_uniform_float("whole_pixel_offset", &uniform_whole_pixel_offset);
glGenTextures(1, &texnum);
+
+ if (!lanczos_table_init_done) {
+ // Could in theory race between two threads if we are unlucky,
+ // but that is harmless, since they'll write the same data.
+ init_lanczos_table();
+ }
}
SingleResamplePassEffect::~SingleResamplePassEffect()
glDeleteTextures(1, &texnum);
}
-std::string SingleResamplePassEffect::output_fragment_shader()
+string SingleResamplePassEffect::output_fragment_shader()
{
char buf[256];
sprintf(buf, "#define DIRECTION_VERTICAL %d\n", (direction == VERTICAL));
// so out[0] will read from parameters <x,y> = <0,0>, <1,0>, <2,0> and so on.
//
// For horizontal scaling, we fill in the exact same texture;
-// the shader just interprets is differently.
-void SingleResamplePassEffect::update_texture(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num)
+// the shader just interprets it differently.
+void SingleResamplePassEffect::update_texture(GLuint glsl_program_num, const string &prefix, unsigned *sampler_num)
{
unsigned src_size, dst_size;
if (direction == SingleResamplePassEffect::HORIZONTAL) {
assert(false);
}
-
// For many resamplings (e.g. 640 -> 1280), we will end up with the same
// set of samples over and over again in a loop. Thus, we can compute only
// the first such loop, and then ask the card to repeat the texture for us.
// This is both easier on the texture cache and lowers our CPU cost for
// generating the kernel somewhat.
- num_loops = gcd(src_size, dst_size);
+ float scaling_factor;
+ if (fabs(zoom - 1.0f) < 1e-6) {
+ num_loops = gcd(src_size, dst_size);
+ scaling_factor = float(dst_size) / float(src_size);
+ } else {
+ // If zooming is enabled (ie., zoom != 1), we turn off the looping.
+ // We _could_ perhaps do it for rational zoom levels (especially
+ // things like 2:1), but it doesn't seem to be worth it, given that
+ // the most common use case would seem to be varying the zoom
+ // from frame to frame.
+ num_loops = 1;
+ scaling_factor = zoom * float(dst_size) / float(src_size);
+ }
slice_height = 1.0f / num_loops;
unsigned dst_samples = dst_size / num_loops;
// Anyhow, in this case we clearly need to look at more source pixels
// to compute the destination pixel, and how many depend on the scaling factor.
// Thus, the kernel width will vary with how much we scale.
- float radius_scaling_factor = std::min(float(dst_size) / float(src_size), 1.0f);
+ float radius_scaling_factor = min(scaling_factor, 1.0f);
int int_radius = lrintf(LANCZOS_RADIUS / radius_scaling_factor);
int src_samples = int_radius * 2 + 1;
- float *weights = new float[dst_samples * src_samples * 2];
+ Tap<float> *weights = new Tap<float>[dst_samples * src_samples];
+ float subpixel_offset = offset - lrintf(offset); // The part not covered by whole_pixel_offset.
+ assert(subpixel_offset >= -0.5f && subpixel_offset <= 0.5f);
for (unsigned y = 0; y < dst_samples; ++y) {
// Find the point around which we want to sample the source image,
// compensating for differing pixel centers as the scale changes.
- float center_src_y = (y + 0.5f) * float(src_size) / float(dst_size) - 0.5f;
+ float center_src_y = (y + 0.5f) / scaling_factor - 0.5f;
int base_src_y = lrintf(center_src_y);
// Now sample <int_radius> pixels on each side around that point.
for (int i = 0; i < src_samples; ++i) {
int src_y = base_src_y + i - int_radius;
- float weight = lanczos_weight(radius_scaling_factor * (src_y - center_src_y), LANCZOS_RADIUS);
- weights[(y * src_samples + i) * 2 + 0] = weight * radius_scaling_factor;
- weights[(y * src_samples + i) * 2 + 1] = (src_y + 0.5) / float(src_size);
+ float weight = lanczos_weight_cached(radius_scaling_factor * (src_y - center_src_y - subpixel_offset));
+ weights[y * src_samples + i].weight = weight * radius_scaling_factor;
+ weights[y * src_samples + i].pos = (src_y + 0.5) / float(src_size);
}
}
// Now make use of the bilinear filtering in the GPU to reduce the number of samples
- // we need to make. This is a bit more complex than BlurEffect since we cannot combine
- // two neighboring samples if their weights have differing signs, so we first need to
- // figure out the maximum number of samples. Then, we downconvert all the weights to
- // that number -- we could have gone for a variable-length system, but this is simpler,
- // and the gains would probably be offset by the extra cost of checking when to stop.
- //
- // The greedy strategy for combining samples is optimal.
- src_bilinear_samples = 0;
+ // we need to make. Try fp16 first; if it's not accurate enough, we go to fp32.
+ // Our tolerance level for total error is a bit higher than the one for invididual
+ // samples, since one would assume overall errors in the shape don't matter as much.
+ const float max_error = 2.0f / (255.0f * 255.0f);
+ Tap<fp16_int_t> *bilinear_weights_fp16;
+ src_bilinear_samples = combine_many_samples(weights, src_size, src_samples, dst_samples, &bilinear_weights_fp16);
+ Tap<float> *bilinear_weights_fp32 = NULL;
+ bool fallback_to_fp32 = false;
+ double max_sum_sq_error_fp16 = 0.0;
for (unsigned y = 0; y < dst_samples; ++y) {
- unsigned num_samples_saved = combine_samples(weights + (y * src_samples) * 2, NULL, src_samples, UINT_MAX);
- src_bilinear_samples = std::max<int>(src_bilinear_samples, src_samples - num_samples_saved);
+ double sum_sq_error_fp16 = compute_sum_sq_error(
+ weights + y * src_samples, src_samples,
+ bilinear_weights_fp16 + y * src_bilinear_samples, src_bilinear_samples,
+ src_size);
+ max_sum_sq_error_fp16 = std::max(max_sum_sq_error_fp16, sum_sq_error_fp16);
+ if (max_sum_sq_error_fp16 > max_error) {
+ break;
+ }
}
- // Now that we know the right width, actually combine the samples.
- float *bilinear_weights = new float[dst_samples * src_bilinear_samples * 2];
- for (unsigned y = 0; y < dst_samples; ++y) {
- unsigned num_samples_saved = combine_samples(
- weights + (y * src_samples) * 2,
- bilinear_weights + (y * src_bilinear_samples) * 2,
- src_samples,
- src_samples - src_bilinear_samples);
- assert(int(src_samples) - int(num_samples_saved) == src_bilinear_samples);
- }
+ if (max_sum_sq_error_fp16 > max_error) {
+ fallback_to_fp32 = true;
+ src_bilinear_samples = combine_many_samples(weights, src_size, src_samples, dst_samples, &bilinear_weights_fp32);
+ }
// Encode as a two-component texture. Note the GL_REPEAT.
glActiveTexture(GL_TEXTURE0 + *sampler_num);
check_error();
glBindTexture(GL_TEXTURE_2D, texnum);
check_error();
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
- check_error();
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
- check_error();
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
- check_error();
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RG32F, src_bilinear_samples, dst_samples, 0, GL_RG, GL_FLOAT, bilinear_weights);
+ if (last_texture_width == -1) {
+ // Need to set this state the first time.
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+ check_error();
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+ check_error();
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+ check_error();
+ }
+
+ GLenum type, internal_format;
+ void *pixels;
+ if (fallback_to_fp32) {
+ type = GL_FLOAT;
+ internal_format = GL_RG32F;
+ pixels = bilinear_weights_fp32;
+ } else {
+ type = GL_HALF_FLOAT;
+ internal_format = GL_RG16F;
+ pixels = bilinear_weights_fp16;
+ }
+
+ if (int(src_bilinear_samples) == last_texture_width &&
+ int(dst_samples) == last_texture_height &&
+ internal_format == last_texture_internal_format) {
+ // Texture dimensions and type are unchanged; it is more efficient
+ // to just update it rather than making an entirely new texture.
+ glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, src_bilinear_samples, dst_samples, GL_RG, type, pixels);
+ } else {
+ glTexImage2D(GL_TEXTURE_2D, 0, internal_format, src_bilinear_samples, dst_samples, 0, GL_RG, type, pixels);
+ last_texture_width = src_bilinear_samples;
+ last_texture_height = dst_samples;
+ last_texture_internal_format = internal_format;
+ }
check_error();
delete[] weights;
- delete[] bilinear_weights;
+ delete[] bilinear_weights_fp16;
+ delete[] bilinear_weights_fp32;
}
-void SingleResamplePassEffect::set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num)
+void SingleResamplePassEffect::set_gl_state(GLuint glsl_program_num, const string &prefix, unsigned *sampler_num)
{
Effect::set_gl_state(glsl_program_num, prefix, sampler_num);
+ assert(input_width > 0);
+ assert(input_height > 0);
+ assert(output_width > 0);
+ assert(output_height > 0);
+
if (input_width != last_input_width ||
input_height != last_input_height ||
output_width != last_output_width ||
- output_height != last_output_height) {
+ output_height != last_output_height ||
+ offset != last_offset ||
+ zoom != last_zoom) {
update_texture(glsl_program_num, prefix, sampler_num);
last_input_width = input_width;
last_input_height = input_height;
last_output_width = output_width;
last_output_height = output_height;
+ last_offset = offset;
+ last_zoom = zoom;
}
glActiveTexture(GL_TEXTURE0 + *sampler_num);
glBindTexture(GL_TEXTURE_2D, texnum);
check_error();
- set_uniform_int(glsl_program_num, prefix, "sample_tex", *sampler_num);
- ++sampler_num;
- set_uniform_int(glsl_program_num, prefix, "num_samples", src_bilinear_samples);
- set_uniform_float(glsl_program_num, prefix, "num_loops", num_loops);
- set_uniform_float(glsl_program_num, prefix, "slice_height", slice_height);
+ uniform_sample_tex = *sampler_num;
+ ++*sampler_num;
+ uniform_num_samples = src_bilinear_samples;
+ uniform_num_loops = num_loops;
+ uniform_slice_height = slice_height;
// Instructions for how to convert integer sample numbers to positions in the weight texture.
- set_uniform_float(glsl_program_num, prefix, "sample_x_scale", 1.0f / src_bilinear_samples);
- set_uniform_float(glsl_program_num, prefix, "sample_x_offset", 0.5f / src_bilinear_samples);
+ uniform_sample_x_scale = 1.0f / src_bilinear_samples;
+ uniform_sample_x_offset = 0.5f / src_bilinear_samples;
+
+ if (direction == SingleResamplePassEffect::VERTICAL) {
+ uniform_whole_pixel_offset = lrintf(offset) / float(input_height);
+ } else {
+ uniform_whole_pixel_offset = lrintf(offset) / float(input_width);
+ }
// We specifically do not want mipmaps on the input texture;
// they break minification.
- glActiveTexture(GL_TEXTURE0);
- check_error();
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
- check_error();
+ Node *self = chain->find_node_for_effect(this);
+ if (chain->has_input_sampler(self, 0)) {
+ glActiveTexture(chain->get_input_sampler(self, 0));
+ check_error();
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ check_error();
+ }
}
+
+} // namespace movit
projects / movit / blobdiff