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1215f6f1fe955d74daf8b69d3aa7fa4a50317e8d
MapLibreParticleLab/src/renderer/painter.cpp
Justin R. Miller 1215f6f1fe refs #101: data sources with styling 
* add second, satellite class to stylesheet
 * get rid of tile clipping masks for now
 * flesh out raster styling properties
2014-04-04 13:24:11 -07:00

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#include <cassert>
#include <algorithm>
#include <llmr/renderer/painter.hpp>
#include <llmr/util/std.hpp>
#include <llmr/renderer/fill_bucket.hpp>
#include <llmr/renderer/line_bucket.hpp>
#include <llmr/renderer/point_bucket.hpp>
#include <llmr/renderer/text_bucket.hpp>
#include <llmr/map/transform.hpp>
#include <llmr/map/settings.hpp>
#include <llmr/geometry/debug_font_buffer.hpp>
#include <llmr/platform/gl.hpp>
#include <llmr/style/style.hpp>
#include <llmr/style/sprite.hpp>
#include <llmr/util/raster.hpp>
using namespace llmr;
#define BUFFER_OFFSET(i) ((char *)nullptr + (i))
Painter::Painter(Transform& transform, Settings& settings, Style& style, GlyphAtlas& glyphAtlas)
: transform(transform),
settings(settings),
style(style),
glyphAtlas(glyphAtlas) {
}
bool Painter::needsAnimation() const {
return frameHistory.needsAnimation(300);
}
void Painter::setup() {
setupShaders();
assert(pointShader);
assert(plainShader);
assert(outlineShader);
assert(lineShader);
assert(linejoinShader);
assert(patternShader);
assert(rasterShader);
assert(textShader);
// Blending
// We are blending new pixels on top of old pixels. Since we have depth testing
// and are drawing opaque fragments first front-to-back, then translucent
// fragments back-to-front, this shades the fewest fragments possible.
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
// Set clear values
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClearDepth(1.0f);
glClearStencil(0x0);
// Stencil test
glEnable(GL_STENCIL_TEST);
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
}
void Painter::setupShaders() {
plainShader = std::make_unique<PlainShader>();
outlineShader = std::make_unique<OutlineShader>();
lineShader = std::make_unique<LineShader>();
linejoinShader = std::make_unique<LinejoinShader>();
patternShader = std::make_unique<PatternShader>();
pointShader = std::make_unique<PointShader>();
rasterShader = std::make_unique<RasterShader>();
textShader = std::make_unique<TextShader>();
}
void Painter::resize(int width, int height) {
glViewport(0, 0, width, height);
}
void Painter::useProgram(uint32_t program) {
if (gl_program != program) {
glUseProgram(program);
gl_program = program;
}
}
void Painter::lineWidth(float lineWidth) {
if (gl_lineWidth != lineWidth) {
glLineWidth(lineWidth);
gl_lineWidth = lineWidth;
}
}
void Painter::depthMask(bool value) {
if (gl_depthMask != value) {
glDepthMask(value ? GL_TRUE : GL_FALSE);
gl_depthMask = value;
}
}
void Painter::changeMatrix() {
// Initialize projection matrix
matrix::ortho(projMatrix, 0, transform.width, transform.height, 0, 0, 1);
// The extrusion matrix.
matrix::identity(extrudeMatrix);
matrix::multiply(extrudeMatrix, projMatrix, extrudeMatrix);
matrix::rotate_z(extrudeMatrix, extrudeMatrix, transform.getAngle());
// The native matrix is a 1:1 matrix that paints the coordinates at the
// same screen position as the vertex specifies.
matrix::identity(nativeMatrix);
matrix::multiply(nativeMatrix, projMatrix, nativeMatrix);
}
void Painter::prepareClippingMask() {
useProgram(plainShader->program);
glDisable(GL_DEPTH_TEST);
depthMask(false);
glDepthRange(1.0f, 1.0f);
coveringPlainArray.bind(*plainShader, tileStencilBuffer, BUFFER_OFFSET(0));
}
void Painter::drawClippingMask(const mat4& matrix, uint8_t clip_id) {
plainShader->setMatrix(matrix);
plainShader->setColor(style.computed.background.color);
plainShader->setOpacity(style.computed.background.opacity);
glStencilFunc(GL_ALWAYS, 1, 0xFF);
glDrawArrays(GL_TRIANGLES, 0, (GLsizei)tileStencilBuffer.index());
}
void Painter::finishClippingMask() {
glEnable(GL_DEPTH_TEST);
depthMask(true);
glStencilMask(0x0);
}
void Painter::clear() {
glStencilMask(0xFF);
depthMask(true);
#ifdef NVIDIA
// We're painting in a way that allows us to skip clearing the color buffer.
// On Tegra hardware, this is faster.
glClear(GL_STENCIL_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
#else
glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
#endif
}
void Painter::render(const Tile& tile) {
assert(tile.data);
if (tile.data->state != TileData::State::parsed) {
return;
}
frameHistory.record(transform.getNormalizedZoom());
matrix = tile.matrix;
renderLayers(tile.data, style.layers);
if (settings.debug) {
renderDebug(tile.data);
}
}
void Painter::renderLayers(const std::shared_ptr<TileData>& tile_data, const std::vector<LayerDescription>& layers) {
float strata_thickness = 1.0f / (layers.size() + 1);
// - FIRST PASS ------------------------------------------------------------
// Render everything top-to-bottom by using reverse iterators. Render opaque
// objects first.
pass = Opaque;
glDisable(GL_BLEND);
depthMask(true);
typedef std::vector<LayerDescription>::const_reverse_iterator riterator;
int i = 0;
for (riterator it = layers.rbegin(), end = layers.rend(); it != end; ++it, ++i) {
strata = i * strata_thickness;
renderLayer(tile_data, *it);
}
// - SECOND PASS -----------------------------------------------------------
// Make a second pass, rendering translucent objects. This time, we render
// bottom-to-top.
pass = Translucent;
glEnable(GL_BLEND);
depthMask(false);
typedef std::vector<LayerDescription>::const_iterator iterator;
--i;
for (iterator it = layers.begin(), end = layers.end(); it != end; ++it, --i) {
strata = i * strata_thickness;
renderLayer(tile_data, *it);
}
}
void Painter::renderLayer(const std::shared_ptr<TileData>& tile_data, const LayerDescription& layer_desc) {
if (layer_desc.child_layer.size()) {
// This is a layer group.
// TODO: create framebuffer
renderLayers(tile_data, layer_desc.child_layer);
// TODO: render framebuffer on previous framebuffer
} else {
// This is a singular layer. Try to find the bucket associated with
// this layer and render it.
if (layer_desc.name == "satellite" && tile_data && tile_data->raster) { // FIXME
renderRaster(layer_desc.name, tile_data);
} else {
auto bucket_it = tile_data->buckets.find(layer_desc.bucket_name);
if (bucket_it != tile_data->buckets.end()) {
assert(bucket_it->second);
bucket_it->second->render(*this, layer_desc.name, tile_data->id);
}
}
}
}
void Painter::renderRaster(const std::string& layer_name, const std::shared_ptr<TileData>& tile_data) {
if (pass == Opaque) return;
const RasterProperties& properties = style.computed.rasters[layer_name];
if (!properties.enabled) return;
useProgram(rasterShader->program);
rasterShader->setMatrix(matrix);
rasterShader->setImage(0);
rasterShader->setOpacity(properties.opacity * tile_data->raster->opacity);
tile_data->raster->bind(true);
coveringRasterArray.bind(*rasterShader, tileStencilBuffer, BUFFER_OFFSET(0));
glDepthRange(strata, 1.0f);
glDrawArrays(GL_TRIANGLES, 0, (GLsizei)tileStencilBuffer.index());
}
void Painter::renderFill(FillBucket& bucket, const std::string& layer_name, const Tile::ID& id) {
// Abort early.
if (bucket.empty()) return;
const FillProperties& properties = style.computed.fills[layer_name];
if (!properties.enabled) return;
Color fill_color = properties.fill_color;
fill_color[0] *= properties.opacity;
fill_color[1] *= properties.opacity;
fill_color[2] *= properties.opacity;
fill_color[3] *= properties.opacity;
Color stroke_color = properties.stroke_color;
stroke_color[0] *= properties.opacity;
stroke_color[1] *= properties.opacity;
stroke_color[2] *= properties.opacity;
stroke_color[3] *= properties.opacity;
bool outline = properties.antialias && properties.stroke_color != properties.fill_color;
bool fringeline = properties.antialias && properties.stroke_color == properties.fill_color;
if (fringeline) {
outline = true;
stroke_color = fill_color;
}
// Because we're drawing top-to-bottom, and we update the stencil mask
// below, we have to draw the outline first (!)
if (outline && pass == Translucent) {
useProgram(outlineShader->program);
outlineShader->setMatrix(matrix);
lineWidth(2.0f); // This is always fixed and does not depend on the pixelRatio!
outlineShader->setColor(stroke_color);
// Draw the entire line
outlineShader->setWorld({{ transform.fb_width, transform.fb_height }});
glDepthRange(strata, 1.0f);
bucket.drawVertices(*outlineShader);
} else if (fringeline) {
// // We're only drawing to the first seven bits (== support a maximum of
// // 127 overlapping polygons in one place before we get rendering errors).
// glStencilMask(0x3F);
// glClear(GL_STENCIL_BUFFER_BIT);
// // Draw front facing triangles. Wherever the 0x80 bit is 1, we are
// // increasing the lower 7 bits by one if the triangle is a front-facing
// // triangle. This means that all visible polygons should be in CCW
// // orientation, while all holes (see below) are in CW orientation.
// glStencilFunc(GL_EQUAL, 0x80, 0x80);
// // When we do a nonzero fill, we count the number of times a pixel is
// // covered by a counterclockwise polygon, and subtract the number of
// // times it is "uncovered" by a clockwise polygon.
// glStencilOp(GL_KEEP, GL_KEEP, GL_INCR_WRAP);
}
if ((fill_color[3] >= 1.0f) == (pass == Opaque)) {
if (properties.image.size() && *style.sprite) {
// Draw texture fill
ImagePosition imagePos = style.sprite->getPosition(properties.image, true);
float factor = 8.0 / pow(2, transform.getIntegerZoom() - id.z);
float mix = fmod(transform.getZoom(), 1.0);
std::array<float, 2> imageSize = {{
imagePos.size.x * factor,
imagePos.size.y *factor
}
};
std::array<float, 2> offset = {{
(float)fmod(id.x * 4096, imageSize[0]),
(float)fmod(id.y * 4096, imageSize[1])
}
};
useProgram(patternShader->program);
patternShader->setMatrix(matrix);
patternShader->setOffset(offset);
patternShader->setPatternSize(imageSize);
patternShader->setPatternTopLeft({{ imagePos.tl.x, imagePos.tl.y }});
patternShader->setPatternBottomRight({{ imagePos.br.x, imagePos.br.y }});
patternShader->setColor(fill_color);
patternShader->setMix(mix);
style.sprite->raster->bind(true);
// Draw the actual triangles into the color & stencil buffer.
glDepthRange(strata + strata_epsilon, 1.0f);
bucket.drawElements(*patternShader);
} else {
// Only draw the fill when it's either opaque and we're drawing opaque
// fragments or when it's translucent and we're drawing translucent
// fragments
// Draw filling rectangle.
useProgram(plainShader->program);
plainShader->setMatrix(matrix);
plainShader->setColor(fill_color);
// Draw the actual triangles into the color & stencil buffer.
glDepthRange(strata + strata_epsilon, 1.0f);
bucket.drawElements(*plainShader);
}
}
// Because we're drawing top-to-bottom, and we update the stencil mask
// below, we have to draw the outline first (!)
if (fringeline && pass == Translucent) {
useProgram(outlineShader->program);
outlineShader->setMatrix(matrix);
lineWidth(3.0f); // This is always fixed and does not depend on the pixelRatio!
outlineShader->setColor(fill_color);
// Draw the entire line
outlineShader->setWorld({{
transform.fb_width,
transform.fb_height
}
});
glDepthRange(strata + strata_epsilon, 1.0f);
bucket.drawVertices(*outlineShader);
}
}
void Painter::renderLine(LineBucket& bucket, const std::string& layer_name, const Tile::ID& id) {
// Abort early.
if (pass == Opaque) return;
if (bucket.empty()) return;
const LineProperties& properties = style.computed.lines[layer_name];
if (!properties.enabled) return;
float width = properties.width;
float offset = properties.offset / 2;
// These are the radii of the line. We are limiting it to 16, which will result
// in a point size of 64 on retina.
float inset = fmin((fmax(-1, offset - width / 2 - 0.5) + 1), 16.0f);
float outset = fmin(offset + width / 2 + 0.5, 16.0f);
Color color = properties.color;
color[0] *= properties.opacity;
color[1] *= properties.opacity;
color[2] *= properties.opacity;
color[3] *= properties.opacity;
glDepthRange(strata, 1.0f);
// We're only drawing end caps + round line joins if the line is > 2px. Otherwise, they aren't visible anyway.
if (bucket.hasPoints() && outset > 1.0f) {
useProgram(linejoinShader->program);
linejoinShader->setMatrix(matrix);
linejoinShader->setColor(color);
linejoinShader->setWorld({{
transform.fb_width * 0.5f,
transform.fb_height * 0.5f
}
});
linejoinShader->setLineWidth({{
((outset - 0.25f) * transform.pixelRatio),
((inset - 0.25f) * transform.pixelRatio)
}
});
float pointSize = ceil(transform.pixelRatio * outset * 2.0);
#if defined(GL_ES_VERSION_2_0)
linejoinShader->setSize(pointSize);
#else
glPointSize(pointSize);
#endif
bucket.drawPoints(*linejoinShader);
}
// var imagePos = properties.image && imageSprite.getPosition(properties.image);
bool imagePos = false;
if (imagePos) {
// var factor = 8 / Math.pow(2, painter.transform.zoom - params.z);
// imageSprite.bind(gl, true);
// //factor = Math.pow(2, 4 - painter.transform.zoom + params.z);
// gl.switchShader(painter.linepatternShader, painter.translatedMatrix || painter.posMatrix, painter.extrudeMatrix);
// shader = painter.linepatternShader;
// glUniform2fv(painter.linepatternShader.u_pattern_size, [imagePos.size[0] * factor, imagePos.size[1] ]);
// glUniform2fv(painter.linepatternShader.u_pattern_tl, imagePos.tl);
// glUniform2fv(painter.linepatternShader.u_pattern_br, imagePos.br);
// glUniform1f(painter.linepatternShader.u_fade, painter.transform.z % 1.0);
} else {
useProgram(lineShader->program);
lineShader->setMatrix(matrix);
lineShader->setExtrudeMatrix(extrudeMatrix);
// TODO: Move this to transform?
const float tilePixelRatio = transform.getScale() / (1 << transform.getIntegerZoom()) / 8;
lineShader->setDashArray({{ 1, -1 }});
lineShader->setLineWidth({{ outset, inset }});
lineShader->setRatio(tilePixelRatio);
lineShader->setColor(color);
bucket.drawLines(*lineShader);
}
}
void Painter::renderPoint(PointBucket& bucket, const std::string& layer_name, const Tile::ID& id) {
// Abort early.
if (!bucket.hasPoints()) return;
if (pass == Opaque) return;
const PointProperties& properties = style.computed.points[layer_name];
if (!properties.enabled) return;
Color color = properties.color;
color[0] *= properties.opacity;
color[1] *= properties.opacity;
color[2] *= properties.opacity;
color[3] *= properties.opacity;
std::string sized_image = properties.image;
sized_image.append("-");
sized_image.append(std::to_string(static_cast<int>(std::round(properties.size))));
ImagePosition imagePos = style.sprite->getPosition(sized_image, false);
// fprintf(stderr, "%f/%f => %f/%f\n", imagePos.tl.x, imagePos.tl.y, imagePos.br.x, imagePos.br.y);
useProgram(pointShader->program);
pointShader->setMatrix(matrix);
pointShader->setImage(0);
pointShader->setColor(color);
const float pointSize = properties.size * 1.4142135623730951 * transform.pixelRatio;
#if defined(GL_ES_VERSION_2_0)
pointShader->setSize(pointSize);
#else
glPointSize(pointSize);
glEnable(GL_POINT_SPRITE);
#endif
pointShader->setPointTopLeft({{ imagePos.tl.x, imagePos.tl.y }});
pointShader->setPointBottomRight({{ imagePos.br.x, imagePos.br.y }});
if (*style.sprite->raster) {
style.sprite->raster->bind(transform.rotating || transform.scaling || transform.panning);
}
glDepthRange(strata, 1.0f);
bucket.drawPoints(*pointShader);
}
void Painter::renderText(TextBucket& bucket, const std::string& layer_name, const Tile::ID& id) {
// Abort early.
if (pass == Opaque) return;
if (bucket.empty()) return;
const TextProperties& properties = style.computed.texts[layer_name];
if (!properties.enabled) return;
mat4 exMatrix;
matrix::copy(exMatrix, projMatrix);
if (bucket.geom_desc.path == TextPathType::Curve) {
matrix::rotate_z(exMatrix, exMatrix, transform.getAngle());
}
const float rotate = properties.rotate;
if (rotate != 0.0f) {
matrix::rotate_z(exMatrix, exMatrix, rotate);
}
// If layerStyle.size > bucket.info.fontSize then labels may collide
float fontSize = fmin(properties.size, bucket.geom_desc.font_size);
matrix::scale(exMatrix, exMatrix, fontSize / 24.0f, fontSize / 24.0f, 1.0f);
useProgram(textShader->program);
textShader->setMatrix(matrix);
textShader->setExtrudeMatrix(exMatrix);
glyphAtlas.bind();
textShader->setTextureSize({{ static_cast<float>(glyphAtlas.width), static_cast<float>(glyphAtlas.height) }});
textShader->setGamma(2.5f / fontSize / transform.pixelRatio);
// Convert the -pi..pi to an int8 range.
float angle = round((transform.getAngle() + rotate) / M_PI * 128);
// adjust min/max zooms for variable font sies
float zoomAdjust = log(fontSize / bucket.geom_desc.font_size) / log(2);
textShader->setAngle((int32_t)(angle + 256) % 256);
textShader->setFlip(bucket.geom_desc.path == TextPathType::Curve ? 1 : 0);
textShader->setZoom((transform.getNormalizedZoom() - zoomAdjust) * 10); // current zoom level
// Label fading
const float duration = 300.0f;
const float currentTime = platform::time() * 1000;
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].time + duration < currentTime) {
history.pop_front();
}
if (history[1].time + duration < currentTime) {
history[0].z = history[1].z;
}
size_t frameLen = history.size();
assert("there should never be less than three frames in the history" && frameLen >= 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 = fmin(startingZ, endingZ);
float highZ = 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.time - history[1].time;
if (timeDiff > duration) timeDiff = 1;
float fadedist = zoomDiff / (timeDiff / duration);
if (isnan(fadedist)) fprintf(stderr, "fadedist should never be NaN");
// 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.time) / duration * fadedist;
textShader->setFadeDist(fadedist * 10);
textShader->setMinFadeZoom(floor(lowZ * 10));
textShader->setMaxFadeZoom(floor(highZ * 10));
textShader->setFadeZoom((transform.getZoom() + bump) * 10);
// We're drawing in the translucent pass which is bottom-to-top, so we need
// to draw the halo first.
if (properties.halo[3] > 0.0f) {
textShader->setColor(properties.halo);
textShader->setBuffer(properties.haloRadius);
glDepthRange(strata, 1.0f);
bucket.drawGlyphs(*textShader);
}
// Then, we draw the text over the halo
textShader->setColor(properties.color);
textShader->setBuffer((256.0f - 64.0f) / 256.0f);
glDepthRange(strata + strata_epsilon, 1.0f);
bucket.drawGlyphs(*textShader);
}
void Painter::renderDebug(const TileData::Ptr& tile_data) {
// Disable depth test and don't count this towards the depth buffer,
// but *don't* disable stencil test, as we want to clip the red tile border
// to the tile viewport.
glDisable(GL_DEPTH_TEST);
useProgram(plainShader->program);
plainShader->setMatrix(matrix);
// draw tile outline
tileBorderArray.bind(*plainShader, tileBorderBuffer, BUFFER_OFFSET(0));
plainShader->setColor(1.0f, 0.0f, 0.0f, 1.0f);
lineWidth(4.0f * transform.pixelRatio);
glDrawArrays(GL_LINE_STRIP, 0, (GLsizei)tileBorderBuffer.index());
// draw debug info
tile_data->debugFontArray.bind(*plainShader, tile_data->debugFontBuffer, BUFFER_OFFSET(0));
plainShader->setColor(1.0f, 1.0f, 1.0f, 1.0f);
lineWidth(4.0f * transform.pixelRatio);
glDrawArrays(GL_LINES, 0, (GLsizei)tile_data->debugFontBuffer.index());
plainShader->setColor(0.0f, 0.0f, 0.0f, 1.0f);
lineWidth(2.0f * transform.pixelRatio);
glDrawArrays(GL_LINES, 0, (GLsizei)tile_data->debugFontBuffer.index());
glEnable(GL_DEPTH_TEST);
}
void Painter::renderMatte() {
glDisable(GL_DEPTH_TEST);
glStencilFunc(GL_EQUAL, 0x0, 0xFF);
Color white = {{ 0.9, 0.9, 0.9, 1 }};
useProgram(plainShader->program);
plainShader->setMatrix(nativeMatrix);
// Draw the clipping mask
matteArray.bind(*plainShader, matteBuffer, BUFFER_OFFSET(0));
plainShader->setColor(white);
glDrawArrays(GL_TRIANGLES, 0, (GLsizei)matteBuffer.index());
glEnable(GL_DEPTH_TEST);
}
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