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port perspective projection matrix from -js

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This commit is contained in:
Ansis Brammanis
2015-08-14 12:41:18 +03:00
parent d513910712
commit 8d22e2bf01
4 changed files with 40 additions and 16 deletions
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21
src/mbgl/map/transform_state.cpp
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@@ -10,19 +10,11 @@ using namespace mbgl;
void TransformState::matrixFor(mat4& matrix, const TileID& id, const int8_t z) const {
const double tile_scale = std::pow(2, z);
const double tile_size = scale * util::tileSize / tile_scale;
double s = util::tileSize * scale / tile_scale;
matrix::identity(matrix);
matrix::translate(matrix, matrix, 0.5f * (float)width, 0.5f * (float)height, 0);
matrix::rotate_z(matrix, matrix, angle);
matrix::translate(matrix, matrix, -0.5f * (float)width, -0.5f * (float)height, 0);
matrix::translate(matrix, matrix, pixel_x() + id.x * tile_size, pixel_y() + id.y * tile_size, 0);
// TODO: Get rid of the 8 (scaling from 4096 to tile size);
float factor = scale / tile_scale / (4096.0f / util::tileSize);
matrix::scale(matrix, matrix, factor, factor, 1);
matrix::translate(matrix, matrix, id.x * s, id.y * s, 0);
matrix::scale(matrix, matrix, s / 4096.0f, s / 4096.0f, 1);
}
box TransformState::cornersToBox(uint32_t z) const {
@@ -154,6 +146,13 @@ float TransformState::getAngle() const {
return angle;
}
float TransformState::getAltitude() const {
return altitude;
}
float TransformState::getPitch() const {
return pitch;
}
#pragma mark - Projection