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#include <mbgl/renderer/painter.hpp>
#include <mbgl/map/map.hpp>
#include <mbgl/style/style_layer.hpp>
#include <mbgl/util/std.hpp>
#include <mbgl/util/string.hpp>
#include <mbgl/util/time.hpp>
#include <mbgl/util/clip_ids.hpp>
#include <mbgl/util/constants.hpp>
#if defined(DEBUG)
#include <mbgl/util/timer.hpp>
#endif
#include <cassert>
#include <algorithm>
using namespace mbgl;
#define BUFFER_OFFSET(i) ((char *)nullptr + (i))
Painter::Painter(Map &map)
: map(map) {
}
Painter::~Painter() {
cleanup();
}
bool Painter::needsAnimation() const {
return frameHistory.needsAnimation(300);
}
void Painter::setup() {
#if defined(DEBUG)
util::timer timer("painter setup");
#endif
setupShaders();
assert(iconShader);
assert(plainShader);
assert(outlineShader);
assert(lineShader);
assert(linejoinShader);
assert(patternShader);
assert(rasterShader);
assert(textShader);
assert(dotShader);
assert(compositeShader);
assert(gaussianShader);
// 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>();
iconShader = std::make_unique<IconShader>();
rasterShader = std::make_unique<RasterShader>();
textShader = std::make_unique<TextShader>();
dotShader = std::make_unique<DotShader>();
compositeShader = std::make_unique<CompositeShader>();
gaussianShader = std::make_unique<GaussianShader>();
}
void Painter::cleanup() {
clearFramebuffers();
}
void Painter::resize() {
const TransformState &state = map.getState();
if (gl_viewport != state.getFramebufferDimensions()) {
gl_viewport = state.getFramebufferDimensions();
assert(gl_viewport[0] > 0 && gl_viewport[1] > 0);
glViewport(0, 0, gl_viewport[0], gl_viewport[1]);
}
}
void Painter::setDebug(bool enabled) {
debug = enabled;
}
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, map.getState().getWidth(), map.getState().getHeight(), 0, 0, 1);
// The extrusion matrix.
matrix::identity(extrudeMatrix);
matrix::multiply(extrudeMatrix, projMatrix, extrudeMatrix);
matrix::rotate_z(extrudeMatrix, extrudeMatrix, map.getState().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::clear() {
gl::group group("clear");
glStencilMask(0xFF);
depthMask(true);
const BackgroundProperties &properties = map.getStyle()->getBackgroundProperties();
glClearColor(properties.color[0], properties.color[1], properties.color[2], properties.color[3]);
glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}
void Painter::setOpaque() {
if (pass != Opaque) {
pass = Opaque;
glDisable(GL_BLEND);
depthMask(true);
}
}
void Painter::setTranslucent() {
if (pass != Translucent) {
pass = Translucent;
glEnable(GL_BLEND);
depthMask(false);
}
}
void Painter::setStrata(float value) {
strata = value;
}
void Painter::prepareTile(const Tile& tile) {
matrix = tile.matrix;
GLint id = (GLint)tile.clip.mask.to_ulong();
GLuint mask = clipMask[tile.clip.length];
glStencilFunc(GL_EQUAL, id, mask);
}
void Painter::renderTileLayer(const Tile& tile, std::shared_ptr<StyleLayer> layer_desc) {
assert(tile.data);
if (tile.data->hasData(layer_desc)) {
gl::group group(util::sprintf<32>("render %d/%d/%d\n", tile.id.z, tile.id.y, tile.id.z));
prepareTile(tile);
tile.data->render(*this, layer_desc);
frameHistory.record(map.getAnimationTime(), map.getState().getNormalizedZoom());
}
}
const mat4 &Painter::translatedMatrix(const std::array<float, 2> &translation, const Tile::ID &id, TranslateAnchorType anchor) {
if (translation[0] == 0 && translation[1] == 0) {
return matrix;
} else {
// TODO: Get rid of the 8 (scaling from 4096 to tile size)
const double factor = ((double)(1 << id.z)) / map.getState().getScale() * (4096.0 / util::tileSize);
if (anchor == TranslateAnchorType::Viewport) {
const double sin_a = std::sin(-map.getState().getAngle());
const double cos_a = std::cos(-map.getState().getAngle());
matrix::translate(vtxMatrix, matrix,
factor * (translation[0] * cos_a - translation[1] * sin_a),
factor * (translation[0] * sin_a + translation[1] * cos_a),
0);
} else {
matrix::translate(vtxMatrix, matrix,
factor * translation[0],
factor * translation[1],
0);
}
return vtxMatrix;
}
}
void Painter::renderMatte() {
gl::group group("matte");
glDisable(GL_DEPTH_TEST);
glStencilFunc(GL_EQUAL, 0x0, 0xFF);
Color matte = {{ 0, 0, 0, 1 }};
useProgram(plainShader->program);
plainShader->setMatrix(nativeMatrix);
// Draw the clipping mask
matteArray.bind(*plainShader, tileStencilBuffer, BUFFER_OFFSET(0));
plainShader->setColor(matte);
glDrawArrays(GL_TRIANGLES, 0, (GLsizei)tileStencilBuffer.index());
glEnable(GL_DEPTH_TEST);
}
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