467 lines
16 KiB
C++
467 lines
16 KiB
C++
#include <mbgl/renderer/painter.hpp>
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#include <mbgl/map/source.hpp>
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#include <mbgl/map/tile.hpp>
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#include <mbgl/map/map_context.hpp>
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#include <mbgl/map/map_data.hpp>
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#include <mbgl/platform/log.hpp>
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#include <mbgl/gl/debugging.hpp>
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#include <mbgl/style/style.hpp>
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#include <mbgl/style/style_layer.hpp>
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#include <mbgl/layer/background_layer.hpp>
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#include <mbgl/geometry/sprite_atlas.hpp>
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#include <mbgl/geometry/line_atlas.hpp>
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#include <mbgl/geometry/glyph_atlas.hpp>
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#include <mbgl/shader/pattern_shader.hpp>
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#include <mbgl/shader/plain_shader.hpp>
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#include <mbgl/shader/outline_shader.hpp>
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#include <mbgl/shader/line_shader.hpp>
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#include <mbgl/shader/linesdf_shader.hpp>
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#include <mbgl/shader/linepattern_shader.hpp>
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#include <mbgl/shader/icon_shader.hpp>
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#include <mbgl/shader/raster_shader.hpp>
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#include <mbgl/shader/sdf_shader.hpp>
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#include <mbgl/shader/dot_shader.hpp>
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#include <mbgl/shader/box_shader.hpp>
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#include <mbgl/shader/circle_shader.hpp>
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#include <mbgl/util/constants.hpp>
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#include <mbgl/util/mat3.hpp>
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#if defined(DEBUG)
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#include <mbgl/util/stopwatch.hpp>
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#endif
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#include <cassert>
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#include <algorithm>
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#include <iostream>
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using namespace mbgl;
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Painter::Painter(MapData& data_) : data(data_) {
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setup();
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}
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Painter::~Painter() {
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}
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bool Painter::needsAnimation() const {
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return frameHistory.needsAnimation(data.getDefaultFadeDuration());
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}
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void Painter::setup() {
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gl::debugging::enable();
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setupShaders();
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assert(iconShader);
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assert(plainShader);
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assert(outlineShader);
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assert(lineShader);
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assert(linepatternShader);
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assert(patternShader);
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assert(rasterShader);
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assert(sdfGlyphShader);
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assert(sdfIconShader);
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assert(dotShader);
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assert(circleShader);
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// Reset GL values
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config.reset();
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}
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void Painter::setupShaders() {
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if (!plainShader) plainShader = std::make_unique<PlainShader>();
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if (!outlineShader) outlineShader = std::make_unique<OutlineShader>();
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if (!lineShader) lineShader = std::make_unique<LineShader>();
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if (!linesdfShader) linesdfShader = std::make_unique<LineSDFShader>();
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if (!linepatternShader) linepatternShader = std::make_unique<LinepatternShader>();
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if (!patternShader) patternShader = std::make_unique<PatternShader>();
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if (!iconShader) iconShader = std::make_unique<IconShader>();
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if (!rasterShader) rasterShader = std::make_unique<RasterShader>();
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if (!sdfGlyphShader) sdfGlyphShader = std::make_unique<SDFGlyphShader>();
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if (!sdfIconShader) sdfIconShader = std::make_unique<SDFIconShader>();
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if (!dotShader) dotShader = std::make_unique<DotShader>();
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if (!collisionBoxShader) collisionBoxShader = std::make_unique<CollisionBoxShader>();
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if (!circleShader) circleShader = std::make_unique<CircleShader>();
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}
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void Painter::resize() {
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if (gl_viewport != frame.framebufferSize) {
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gl_viewport = frame.framebufferSize;
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assert(gl_viewport[0] > 0 && gl_viewport[1] > 0);
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MBGL_CHECK_ERROR(glViewport(0, 0, gl_viewport[0], gl_viewport[1]));
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}
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}
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void Painter::useProgram(GLuint program) {
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if (gl_program != program) {
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MBGL_CHECK_ERROR(glUseProgram(program));
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gl_program = program;
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}
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}
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void Painter::lineWidth(GLfloat line_width) {
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if (gl_lineWidth != line_width) {
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MBGL_CHECK_ERROR(glLineWidth(line_width));
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gl_lineWidth = line_width;
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}
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}
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void Painter::changeMatrix() {
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state.getProjMatrix(projMatrix);
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// The extrusion matrix.
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matrix::ortho(extrudeMatrix, 0, state.getWidth(), state.getHeight(), 0, 0, -1);
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// The native matrix is a 1:1 matrix that paints the coordinates at the
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// same screen position as the vertex specifies.
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matrix::identity(nativeMatrix);
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matrix::multiply(nativeMatrix, projMatrix, nativeMatrix);
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}
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void Painter::clear() {
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MBGL_DEBUG_GROUP("clear");
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config.stencilTest = GL_TRUE;
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config.stencilMask = 0xFF;
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config.depthTest = GL_FALSE;
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config.depthMask = GL_TRUE;
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config.clearColor = { background[0], background[1], background[2], background[3] };
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MBGL_CHECK_ERROR(glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT | GL_DEPTH_BUFFER_BIT));
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}
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void Painter::prepareTile(const Tile& tile) {
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const GLint ref = (GLint)tile.clip.reference.to_ulong();
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const GLuint mask = (GLuint)tile.clip.mask.to_ulong();
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config.stencilFunc = { GL_EQUAL, ref, mask };
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}
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void Painter::render(const Style& style, TransformState state_, const FrameData& frame_) {
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state = state_;
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frame = frame_;
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if (data.contextMode == GLContextMode::Shared) {
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config.restore();
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}
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glyphAtlas = style.glyphAtlas.get();
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spriteAtlas = style.spriteAtlas.get();
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lineAtlas = style.lineAtlas.get();
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std::set<Source*> sources;
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for (const auto& source : style.sources) {
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if (source->enabled) {
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sources.insert(source.get());
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}
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}
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resize();
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changeMatrix();
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// Figure out what buckets we have to draw and what order we have to draw them in.
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const auto order = determineRenderOrder(style);
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// - UPLOAD PASS -------------------------------------------------------------------------------
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// Uploads all required buffers and images before we do any actual rendering.
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{
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MBGL_DEBUG_GROUP("upload");
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tileStencilBuffer.upload();
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tileBorderBuffer.upload();
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spriteAtlas->upload();
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lineAtlas->upload();
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glyphAtlas->upload();
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for (const auto& item : order) {
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if (item.bucket && item.bucket->needsUpload()) {
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item.bucket->upload();
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}
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}
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}
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// - CLIPPING MASKS ----------------------------------------------------------------------------
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// Draws the clipping masks to the stencil buffer.
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{
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MBGL_DEBUG_GROUP("clip");
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// Update all clipping IDs.
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ClipIDGenerator generator;
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for (const auto& source : sources) {
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generator.update(source->getLoadedTiles());
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source->updateMatrices(projMatrix, state);
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}
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clear();
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drawClippingMasks(sources);
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}
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frameHistory.record(data.getAnimationTime(), state.getNormalizedZoom());
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// Actually render the layers
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if (debug::renderTree) { Log::Info(Event::Render, "{"); indent++; }
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// TODO: Correctly compute the number of layers recursively beforehand.
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depthRangeSize = 1 - (order.size() + 2) * numSublayers * depthEpsilon;
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// - OPAQUE PASS -------------------------------------------------------------------------------
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// Render everything top-to-bottom by using reverse iterators. Render opaque objects first.
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renderPass(RenderPass::Opaque,
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order.rbegin(), order.rend(),
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0, 1);
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// - TRANSLUCENT PASS --------------------------------------------------------------------------
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// Make a second pass, rendering translucent objects. This time, we render bottom-to-top.
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renderPass(RenderPass::Translucent,
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order.begin(), order.end(),
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static_cast<GLsizei>(order.size()) - 1, -1);
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if (debug::renderTree) { Log::Info(Event::Render, "}"); indent--; }
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// - DEBUG PASS --------------------------------------------------------------------------------
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// Renders debug overlays.
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{
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MBGL_DEBUG_GROUP("debug");
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// Finalize the rendering, e.g. by calling debug render calls per tile.
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// This guarantees that we have at least one function per tile called.
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// When only rendering layers via the stylesheet, it's possible that we don't
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// ever visit a tile during rendering.
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for (const auto& source : sources) {
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source->finishRender(*this);
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}
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}
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// TODO: Find a better way to unbind VAOs after we're done with them without introducing
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// unnecessary bind(0)/bind(N) sequences.
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{
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MBGL_DEBUG_GROUP("cleanup");
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MBGL_CHECK_ERROR(glBindTexture(GL_TEXTURE_2D, 0));
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MBGL_CHECK_ERROR(VertexArrayObject::Unbind());
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}
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if (data.contextMode == GLContextMode::Shared) {
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config.save();
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}
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}
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template <class Iterator>
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void Painter::renderPass(RenderPass pass_,
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Iterator it, Iterator end,
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GLsizei i, int8_t increment) {
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pass = pass_;
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MBGL_DEBUG_GROUP(pass == RenderPass::Opaque ? "opaque" : "translucent");
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if (debug::renderTree) {
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Log::Info(Event::Render, "%*s%s {", indent++ * 4, "",
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pass == RenderPass::Opaque ? "opaque" : "translucent");
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}
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config.blend = pass == RenderPass::Translucent;
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for (; it != end; ++it, i += increment) {
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currentLayer = i;
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const auto& item = *it;
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if (item.bucket && item.tile) {
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if (item.layer.hasRenderPass(pass)) {
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MBGL_DEBUG_GROUP(item.layer.id + " - " + std::string(item.tile->id));
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prepareTile(*item.tile);
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item.bucket->render(*this, item.layer, item.tile->id, item.tile->matrix);
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}
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} else {
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MBGL_DEBUG_GROUP("background");
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renderBackground(dynamic_cast<const BackgroundLayer&>(item.layer));
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}
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}
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if (debug::renderTree) {
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Log::Info(Event::Render, "%*s%s", --indent * 4, "", "}");
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}
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}
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std::vector<RenderItem> Painter::determineRenderOrder(const Style& style) {
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std::vector<RenderItem> order;
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for (const auto& layerPtr : style.layers) {
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const auto& layer = *layerPtr;
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if (layer.visibility == VisibilityType::None) continue;
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if (layer.type == StyleLayerType::Background) {
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// This layer defines a background color/image.
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auto& props = dynamic_cast<const BackgroundLayer&>(layer).properties;
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if (props.image.from.empty()) {
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// This is a solid background. We can use glClear().
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background = props.color;
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background[0] *= props.opacity;
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background[1] *= props.opacity;
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background[2] *= props.opacity;
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background[3] *= props.opacity;
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} else {
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// This is a textured background. We need to render it with a quad.
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background = {{ 0, 0, 0, 0 }};
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order.emplace_back(layer);
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}
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continue;
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}
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Source* source = style.getSource(layer.source);
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if (!source) {
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Log::Warning(Event::Render, "can't find source for layer '%s'", layer.id.c_str());
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continue;
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}
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// Skip this layer if it's outside the range of min/maxzoom.
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// This may occur when there /is/ a bucket created for this layer, but the min/max-zoom
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// is set to a fractional value, or value that is larger than the source maxzoom.
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const double zoom = state.getZoom();
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if (layer.minZoom > zoom ||
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layer.maxZoom <= zoom) {
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continue;
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}
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const auto& tiles = source->getTiles();
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for (auto tile : tiles) {
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assert(tile);
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if (!tile->data && !tile->data->isReady()) {
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continue;
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}
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// We're not clipping symbol layers, so when we have both parents and children of symbol
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// layers, we drop all children in favor of their parent to avoid duplicate labels.
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// See https://github.com/mapbox/mapbox-gl-native/issues/2482
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if (layer.type == StyleLayerType::Symbol) {
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bool skip = false;
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// Look back through the buckets we decided to render to find out whether there is
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// already a bucket from this layer that is a parent of this tile. Tiles are ordered
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// by zoom level when we obtain them from getTiles().
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for (auto it = order.rbegin(); it != order.rend() && (&it->layer == &layer); ++it) {
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if (tile->id.isChildOf(it->tile->id)) {
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skip = true;
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break;
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}
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}
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if (skip) {
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continue;
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}
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}
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auto bucket = tile->data->getBucket(layer);
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if (bucket) {
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order.emplace_back(layer, tile, bucket);
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}
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}
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}
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return order;
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}
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void Painter::renderBackground(const BackgroundLayer& layer) {
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// Note: This function is only called for textured background. Otherwise, the background color
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// is created with glClear.
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const BackgroundPaintProperties& properties = layer.properties;
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if (!properties.image.to.empty()) {
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if ((properties.opacity >= 1.0f) != (pass == RenderPass::Opaque))
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return;
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SpriteAtlasPosition imagePosA = spriteAtlas->getPosition(properties.image.from, true);
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SpriteAtlasPosition imagePosB = spriteAtlas->getPosition(properties.image.to, true);
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float zoomFraction = state.getZoomFraction();
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useProgram(patternShader->program);
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patternShader->u_matrix = identityMatrix;
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patternShader->u_pattern_tl_a = imagePosA.tl;
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patternShader->u_pattern_br_a = imagePosA.br;
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patternShader->u_pattern_tl_b = imagePosB.tl;
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patternShader->u_pattern_br_b = imagePosB.br;
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patternShader->u_mix = properties.image.t;
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patternShader->u_opacity = properties.opacity;
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LatLng latLng = state.getLatLng();
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vec2<double> center = state.latLngToPoint(latLng);
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float scale = 1 / std::pow(2, zoomFraction);
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std::array<float, 2> sizeA = imagePosA.size;
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mat3 matrixA;
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matrix::identity(matrixA);
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matrix::scale(matrixA, matrixA,
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1.0f / (sizeA[0] * properties.image.fromScale),
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1.0f / (sizeA[1] * properties.image.fromScale));
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matrix::translate(matrixA, matrixA,
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std::fmod(center.x * 512, sizeA[0] * properties.image.fromScale),
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std::fmod(center.y * 512, sizeA[1] * properties.image.fromScale));
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matrix::rotate(matrixA, matrixA, -state.getAngle());
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matrix::scale(matrixA, matrixA,
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scale * state.getWidth() / 2,
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-scale * state.getHeight() / 2);
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std::array<float, 2> sizeB = imagePosB.size;
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mat3 matrixB;
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matrix::identity(matrixB);
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matrix::scale(matrixB, matrixB,
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1.0f / (sizeB[0] * properties.image.toScale),
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1.0f / (sizeB[1] * properties.image.toScale));
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matrix::translate(matrixB, matrixB,
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std::fmod(center.x * 512, sizeB[0] * properties.image.toScale),
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std::fmod(center.y * 512, sizeB[1] * properties.image.toScale));
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matrix::rotate(matrixB, matrixB, -state.getAngle());
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matrix::scale(matrixB, matrixB,
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scale * state.getWidth() / 2,
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-scale * state.getHeight() / 2);
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patternShader->u_patternmatrix_a = matrixA;
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patternShader->u_patternmatrix_b = matrixB;
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VertexArrayObject::Unbind();
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backgroundBuffer.bind();
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patternShader->bind(0);
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spriteAtlas->bind(true);
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}
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config.stencilTest = false;
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config.depthTest = true;
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config.depthRange = { 1.0f, 1.0f };
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MBGL_CHECK_ERROR(glDrawArrays(GL_TRIANGLE_STRIP, 0, 4));
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}
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mat4 Painter::translatedMatrix(const mat4& matrix, const std::array<float, 2> &translation, const TileID &id, TranslateAnchorType anchor) {
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if (translation[0] == 0 && translation[1] == 0) {
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return matrix;
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} else {
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// TODO: Get rid of the 8 (scaling from 4096 to tile size)
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const double factor = ((double)(1 << id.z)) / state.getScale() * (4096.0 / util::tileSize / id.overscaling);
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mat4 vtxMatrix;
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if (anchor == TranslateAnchorType::Viewport) {
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const double sin_a = std::sin(-state.getAngle());
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const double cos_a = std::cos(-state.getAngle());
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matrix::translate(vtxMatrix, matrix,
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factor * (translation[0] * cos_a - translation[1] * sin_a),
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factor * (translation[0] * sin_a + translation[1] * cos_a),
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0);
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} else {
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matrix::translate(vtxMatrix, matrix,
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factor * translation[0],
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factor * translation[1],
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0);
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}
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return vtxMatrix;
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}
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}
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void Painter::setDepthSublayer(int n) {
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float nearDepth = ((1 + currentLayer) * numSublayers + n) * depthEpsilon;
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float farDepth = nearDepth + depthRangeSize;
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config.depthRange = { nearDepth, farDepth };
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}
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