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#include <mbgl/renderer/frame_history.hpp>
#include <mbgl/math/minmax.hpp>
namespace mbgl {
FrameHistory::FrameHistory() {
changeOpacities.fill(0);
opacities.fill(0);
}
void FrameHistory::record(const TimePoint& now, float zoom, const Duration& duration) {
int16_t zoomIndex = std::floor(zoom * 10.0);
if (firstFrame) {
changeTimes.fill(now);
for (int16_t z = 0; z <= zoomIndex; z++) {
opacities[z] = 255u;
}
firstFrame = false;
}
if (zoomIndex < previousZoomIndex) {
for (int16_t z = zoomIndex + 1; z <= previousZoomIndex; z++) {
changeTimes[z] = now;
changeOpacities[z] = opacities[z];
}
} else {
for (int16_t z = zoomIndex; z > previousZoomIndex; z--) {
changeTimes[z] = now;
changeOpacities[z] = opacities[z];
}
}
for (int16_t z = 0; z <= 255; z++) {
std::chrono::duration<float> timeDiff = now - changeTimes[z];
int32_t opacityChange = (duration == Milliseconds(0) ? 1 : (timeDiff / duration)) * 255;
if (z <= zoomIndex) {
opacities[z] = util::min(255, changeOpacities[z] + opacityChange);
} else {
opacities[z] = util::max(0, changeOpacities[z] - opacityChange);
}
}
changed = true;
if (zoomIndex != previousZoomIndex) {
previousZoomIndex = zoomIndex;
previousTime = now;
}
time = now;
}
bool FrameHistory::needsAnimation(const Duration& duration) const {
return (time - previousTime) < duration;
}
void FrameHistory::upload(gl::ObjectStore& store) {
if (changed) {
const bool first = !texture;
bind(store);
if (first) {
MBGL_CHECK_ERROR(glTexImage2D(
GL_TEXTURE_2D, // GLenum target
0, // GLint level
GL_ALPHA, // GLint internalformat
width, // GLsizei width
height, // GLsizei height
0, // GLint border
GL_ALPHA, // GLenum format
GL_UNSIGNED_BYTE, // GLenum type
opacities.data()
));
} else {
MBGL_CHECK_ERROR(glTexSubImage2D(
GL_TEXTURE_2D, // GLenum target
0, // GLint level
0, // GLint xoffset
0, // GLint yoffset
width, // GLsizei width
height, // GLsizei height
GL_ALPHA, // GLenum format
GL_UNSIGNED_BYTE, // GLenum type
opacities.data()
));
}
changed = false;
}
}
void FrameHistory::bind(gl::ObjectStore& store) {
if (!texture) {
texture = store.createTexture();
MBGL_CHECK_ERROR(glBindTexture(GL_TEXTURE_2D, *texture));
#ifndef GL_ES_VERSION_2_0
MBGL_CHECK_ERROR(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0));
#endif
MBGL_CHECK_ERROR(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));
MBGL_CHECK_ERROR(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));
MBGL_CHECK_ERROR(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST));
MBGL_CHECK_ERROR(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST));
} else {
MBGL_CHECK_ERROR(glBindTexture(GL_TEXTURE_2D, *texture));
}
}
} // namespace mbgl
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