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#include <mbgl/renderer/painter.hpp>
#include <mbgl/renderer/symbol_bucket.hpp>
#include <mbgl/style/style_layer.hpp>
#include <mbgl/geometry/glyph_atlas.hpp>
#include <mbgl/geometry/sprite_atlas.hpp>
#include <mbgl/map/map.hpp>
#include <mbgl/util/math.hpp>
#include <cmath>
namespace mbgl {
void Painter::renderSymbol(SymbolBucket &bucket, std::shared_ptr<StyleLayer> layer_desc,
const Tile::ID &/*id*/) {
// Abort early.
if (pass == Opaque) {
return;
}
const SymbolProperties &properties = layer_desc->getProperties<SymbolProperties>();
if (bucket.hasTextData()) {
mat4 exMatrix;
matrix::copy(exMatrix, projMatrix);
if (bucket.properties.placement == PlacementType::Line) {
matrix::rotate_z(exMatrix, exMatrix, map.getState().getAngle());
}
// If layerStyle.size > bucket.info.fontSize then labels may collide
float fontSize = std::fmin(properties.text.size, bucket.properties.text.max_size);
matrix::scale(exMatrix, exMatrix, fontSize / 24.0f, fontSize / 24.0f, 1.0f);
useProgram(textShader->program);
textShader->setMatrix(matrix);
textShader->setExtrudeMatrix(exMatrix);
GlyphAtlas &glyphAtlas = *map.getGlyphAtlas();
glyphAtlas.bind();
textShader->setTextureSize(
{{static_cast<float>(glyphAtlas.width), static_cast<float>(glyphAtlas.height)}});
// Convert the -pi..pi to an int8 range.
float angle = std::round((map.getState().getAngle()) / M_PI * 128);
// adjust min/max zooms for variable font sies
float zoomAdjust = log(fontSize / bucket.properties.text.max_size) / log(2);
textShader->setAngle((int32_t)(angle + 256) % 256);
textShader->setFlip(bucket.properties.placement == PlacementType::Line ? 1 : 0);
textShader->setZoom((map.getState().getNormalizedZoom() - zoomAdjust) *
10); // current zoom level
// Label fading
const timestamp duration = 300_milliseconds;
const timestamp currentTime = util::now();
std::deque<FrameSnapshot> &history = frameHistory.history;
// Remove frames until only one is outside the duration, or until there are only three
while (history.size() > 3 && history[1].t + duration < currentTime) {
history.pop_front();
}
if (history[1].t + duration < currentTime) {
history[0].z = history[1].z;
}
assert("there should never be less than three frames in the history" &&
(history.size() >= 3));
// Find the range of zoom levels we want to fade between
float startingZ = history.front().z;
const FrameSnapshot lastFrame = history.back();
float endingZ = lastFrame.z;
float lowZ = std::fmin(startingZ, endingZ);
float highZ = std::fmax(startingZ, endingZ);
// Calculate the speed of zooming, and how far it would zoom in terms of zoom levels in one
// duration
float zoomDiff = endingZ - history[1].z, timeDiff = lastFrame.t - history[1].t;
float fadedist = zoomDiff / (timeDiff / duration);
#if defined(DEBUG)
// if (std::isnan(fadedist))
// fprintf(stderr, "fadedist should never be NaN\n");
#endif
// At end of a zoom when the zoom stops changing continue pretending to zoom at that speed
// bump is how much farther it would have been if it had continued zooming at the same rate
float bump = (currentTime - lastFrame.t) / duration * fadedist;
textShader->setFadeDist(fadedist * 10);
textShader->setMinFadeZoom(std::floor(lowZ * 10));
textShader->setMaxFadeZoom(std::floor(highZ * 10));
textShader->setFadeZoom((map.getState().getNormalizedZoom() + bump) * 10);
// This defines the gamma around the SDF cutoff value.
const float sdfGamma = 1.0f / 10.0f;
// Our signed distance fields are scaled so that 1 pixel is scaled to 32 pixels.
// Our cutoff between positive and negative values is hard coded to 64 (== 2 pixels).
// This means that our 6/8 of the value range lies outside the glyph outline.
const float sdfOffset = (256.0f - 64.0f) / 32.0f;
// Currently, all of our fonts are rendered with a font size of 24px.
const float sdfFontSize = 24.0f;
// The default gamma value has to be adjust for the current pixelratio so that we're not
// drawing
// blurry font on retina screens.
const float gamma = sdfGamma * sdfFontSize / fontSize / map.getState().getPixelRatio();
// We're drawing in the translucent pass which is bottom-to-top, so we need
// to draw the halo first.
if (properties.text.halo_color[3] > 0.0f) {
const float haloWidth = util::clamp(
(sdfOffset - properties.text.halo_width / (fontSize / sdfFontSize)) / 8.0f, 0.0f,
1.0f);
if (properties.text.halo_blur != 0.0f) {
// We are converting the halo_blur value to current screen pixels.
// Then we're dividing it by two because the gamma value is added/subtracted into
// both
// directions in the shader, but the halo_blur describes the entire width of the
// blur.
// Note that this does *not* have to be adjusted for retina screens, because we want
// the
// same blur width when we explicitly specify one.
textShader->setGamma((properties.text.halo_blur / (fontSize / sdfFontSize)) / 8.0f /
2.0f);
} else {
textShader->setGamma(sdfGamma);
}
if (properties.text.opacity < 1.0f) {
Color color = properties.text.halo_color;
color[0] *= properties.text.opacity;
color[1] *= properties.text.opacity;
color[2] *= properties.text.opacity;
color[3] *= properties.text.opacity;
textShader->setColor(color);
} else {
textShader->setColor(properties.text.halo_color);
}
textShader->setBuffer(haloWidth);
glDepthRange(strata, 1.0f);
bucket.drawGlyphs(*textShader);
}
if (properties.text.color[3] > 0.0f) {
// Then, we draw the text over the halo
textShader->setGamma(gamma);
if (properties.text.opacity < 1.0f) {
Color color = properties.text.color;
color[0] *= properties.text.opacity;
color[1] *= properties.text.opacity;
color[2] *= properties.text.opacity;
color[3] *= properties.text.opacity;
textShader->setColor(color);
} else {
textShader->setColor(properties.text.color);
}
textShader->setBuffer((256.0f - 64.0f) / 256.0f);
glDepthRange(strata + strata_epsilon, 1.0f);
bucket.drawGlyphs(*textShader);
}
}
if (bucket.hasIconData()) {
mat4 exMatrix;
matrix::copy(exMatrix, projMatrix);
const float angleOffset =
bucket.properties.icon.rotation_alignment == RotationAlignmentType::Map
? map.getState().getAngle()
: 0;
if (angleOffset) {
matrix::rotate_z(exMatrix, exMatrix, angleOffset);
}
// If layerStyle.size > bucket.info.fontSize then labels may collide
const float fontSize = properties.icon.size != 0 ? properties.icon.size : bucket.properties.icon.max_size;
const float fontScale = fontSize / 1.0f;
matrix::scale(exMatrix, exMatrix, fontScale, fontScale, 1.0f);
useProgram(iconShader->program);
iconShader->setMatrix(matrix);
iconShader->setExtrudeMatrix(exMatrix);
SpriteAtlas &spriteAtlas = *map.getSpriteAtlas();
spriteAtlas.bind(map.getState().isChanging() || bucket.properties.placement == PlacementType::Line || angleOffset != 0 || fontScale != 1);
iconShader->setTextureSize(
{{static_cast<float>(spriteAtlas.getWidth()), static_cast<float>(spriteAtlas.getHeight())}});
// Convert the -pi..pi to an int8 range.
const float angle = std::round((map.getState().getAngle()) / M_PI * 128);
// adjust min/max zooms for variable font sies
float zoomAdjust = log(fontSize / bucket.properties.icon.max_size) / log(2);
iconShader->setAngle((int32_t)(angle + 256) % 256);
iconShader->setFlip(bucket.properties.placement == PlacementType::Line ? 1 : 0);
iconShader->setZoom((map.getState().getNormalizedZoom() - zoomAdjust) *
10); // current zoom level
iconShader->setFadeDist(0 * 10);
iconShader->setMinFadeZoom(map.getState().getNormalizedZoom() * 10);
iconShader->setMaxFadeZoom(map.getState().getNormalizedZoom() * 10);
iconShader->setFadeZoom(map.getState().getNormalizedZoom() * 10);
iconShader->setOpacity(properties.icon.opacity);
glDepthRange(strata, 1.0f);
bucket.drawIcons(*iconShader);
}
}
}
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