diff options
Diffstat (limited to 'src/renderer/painter_symbol.cpp')
| -rw-r--r-- | src/renderer/painter_symbol.cpp | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/src/renderer/painter_symbol.cpp b/src/renderer/painter_symbol.cpp new file mode 100644 index 0000000000..8201e4b7f1 --- /dev/null +++ b/src/renderer/painter_symbol.cpp @@ -0,0 +1,202 @@ +#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; + } + + if (bucket.hasTextData()) { + const SymbolProperties &properties = layer_desc->getProperties<SymbolProperties>(); + + 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); + + // TODO: figure out whether we actually need to account for this while painting; we might + // already have + // done this during label placement. + // const mat4 &vtxMatrix = translatedMatrix(properties.translate, id, + // properties.translateAnchor); + + 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 = 0.75f / 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()) { + SpriteAtlas &spriteAtlas = *map.getSpriteAtlas(); + + useProgram(iconShader->program); + iconShader->setMatrix(matrix); + + // TODO: update + iconShader->setColor({{1, 1, 1, 1}}); + iconShader->setImage(0); + iconShader->setRatio(map.getState().getPixelRatio()); + iconShader->setDimension({{ + spriteAtlas.getTextureWidth(), spriteAtlas.getTextureHeight(), + }}); + + spriteAtlas.bind(map.getState().isChanging()); + + // TODO: remove hardcoded icon size. + const float iconSize = 12 * map.getState().getPixelRatio(); + iconShader->setSize(iconSize); +#ifndef GL_ES_VERSION_2_0 + glPointSize(iconSize); + glEnable(GL_POINT_SPRITE); +#endif + + glDepthRange(strata, 1.0f); + bucket.drawIcons(*iconShader); + } +} +} |