1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
#include <mbgl/renderer/render_tile.hpp>
#include <mbgl/renderer/painter.hpp>
#include <mbgl/map/transform_state.hpp>
#include <mbgl/tile/tile.hpp>
namespace mbgl {
using namespace style;
mat4 RenderTile::translateVtxMatrix(const mat4& tileMatrix,
const std::array<float, 2>& translation,
TranslateAnchorType anchor,
const TransformState& state) const {
if (translation[0] == 0 && translation[1] == 0) {
return tileMatrix;
}
mat4 vtxMatrix;
if (anchor == TranslateAnchorType::Viewport) {
const double sin_a = std::sin(-state.getAngle());
const double cos_a = std::cos(-state.getAngle());
matrix::translate(vtxMatrix, tileMatrix,
id.pixelsToTileUnits(translation[0] * cos_a - translation[1] * sin_a, state.getZoom()),
id.pixelsToTileUnits(translation[0] * sin_a + translation[1] * cos_a, state.getZoom()),
0);
} else {
matrix::translate(vtxMatrix, tileMatrix,
id.pixelsToTileUnits(translation[0], state.getZoom()),
id.pixelsToTileUnits(translation[1], state.getZoom()),
0);
}
return vtxMatrix;
}
mat4 RenderTile::translatedMatrix(const std::array<float, 2>& translation,
TranslateAnchorType anchor,
const TransformState& state) const {
return translateVtxMatrix(matrix, translation, anchor, state);
}
mat4 RenderTile::translatedClipMatrix(const std::array<float, 2>& translation,
TranslateAnchorType anchor,
const TransformState& state) const {
return translateVtxMatrix(nearClippedMatrix, translation, anchor, state);
}
void RenderTile::startRender(Painter& painter) {
tile.upload(painter.context);
// Calculate two matrices for this tile: matrix is the standard tile matrix; nearClippedMatrix
// clips the near plane to 100 to save depth buffer precision
painter.state.matrixFor(matrix, id);
painter.state.matrixFor(nearClippedMatrix, id);
matrix::multiply(matrix, painter.projMatrix, matrix);
matrix::multiply(nearClippedMatrix, painter.nearClippedProjMatrix, nearClippedMatrix);
}
} // namespace mbgl
|
