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Diffstat (limited to 'src/mbgl/programs/line_program.hpp')
| -rw-r--r-- | src/mbgl/programs/line_program.hpp | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/src/mbgl/programs/line_program.hpp b/src/mbgl/programs/line_program.hpp new file mode 100644 index 0000000000..960438f4cd --- /dev/null +++ b/src/mbgl/programs/line_program.hpp @@ -0,0 +1,184 @@ +#pragma once + +#include <mbgl/programs/program.hpp> +#include <mbgl/programs/attributes.hpp> +#include <mbgl/programs/uniforms.hpp> +#include <mbgl/shader/line.hpp> +#include <mbgl/shader/line_pattern.hpp> +#include <mbgl/shader/line_sdf.hpp> +#include <mbgl/util/geometry.hpp> + +#include <cmath> + +namespace mbgl { + +namespace style { +class LinePaintProperties; +} // namespace style + +class RenderTile; +class TransformState; +class LinePatternPos; +class SpriteAtlasPosition; + +namespace uniforms { +MBGL_DEFINE_UNIFORM_SCALAR(float, u_ratio); +MBGL_DEFINE_UNIFORM_SCALAR(float, u_linewidth); +MBGL_DEFINE_UNIFORM_SCALAR(float, u_gapwidth); +MBGL_DEFINE_UNIFORM_SCALAR(float, u_antialiasing); +MBGL_DEFINE_UNIFORM_SCALAR(float, u_extra); +MBGL_DEFINE_UNIFORM_SCALAR(float, u_offset); +MBGL_DEFINE_UNIFORM_SCALAR(float, u_tex_y_a); +MBGL_DEFINE_UNIFORM_SCALAR(float, u_tex_y_b); +MBGL_DEFINE_UNIFORM_SCALAR(float, u_sdfgamma); +MBGL_DEFINE_UNIFORM_SCALAR(float, u_fade); +MBGL_DEFINE_UNIFORM_VECTOR(float, 2, u_patternscale_a); +MBGL_DEFINE_UNIFORM_VECTOR(float, 2, u_patternscale_b); +MBGL_DEFINE_UNIFORM_MATRIX(double, 2, u_antialiasingmatrix); +} // namespace uniforms + +struct LineAttributes : gl::Attributes< + attributes::a_pos, + attributes::a_data<4>> +{ + /* + * @param p vertex position + * @param e extrude normal + * @param t texture normal + * @param dir direction of the line cap (-1/0/1) + */ + static Vertex vertex(Point<int16_t> p, Point<double> e, Point<bool> t, int8_t dir, int32_t linesofar = 0) { + return Vertex { + { + static_cast<int16_t>((p.x * 2) | t.x), + static_cast<int16_t>((p.y * 2) | t.y) + }, + { + // add 128 to store an byte in an unsigned byte + static_cast<uint8_t>(::round(extrudeScale * e.x) + 128), + static_cast<uint8_t>(::round(extrudeScale * e.y) + 128), + + // Encode the -1/0/1 direction value into the first two bits of .z of a_data. + // Combine it with the lower 6 bits of `linesofar` (shifted by 2 bites to make + // room for the direction value). The upper 8 bits of `linesofar` are placed in + // the `w` component. `linesofar` is scaled down by `LINE_DISTANCE_SCALE` so that + // we can store longer distances while sacrificing precision. + + // Encode the -1/0/1 direction value into .zw coordinates of a_data, which is normally covered + // by linesofar, so we need to merge them. + // The z component's first bit, as well as the sign bit is reserved for the direction, + // so we need to shift the linesofar. + static_cast<uint8_t>(((dir == 0 ? 0 : (dir < 0 ? -1 : 1 )) + 1) | ((linesofar & 0x3F) << 2)), + static_cast<uint8_t>(linesofar >> 6) + } + }; + } + + /* + * Scale the extrusion vector so that the normal length is this value. + * Contains the "texture" normals (-1..1). This is distinct from the extrude + * normals for line joins, because the x-value remains 0 for the texture + * normal array, while the extrude normal actually moves the vertex to create + * the acute/bevelled line join. + */ + static const int8_t extrudeScale = 63; +}; + +using LineVertex = LineAttributes::Vertex; + +class LineProgram : public Program< + shaders::line, + LineAttributes, + gl::Uniforms< + uniforms::u_matrix, + uniforms::u_opacity, + uniforms::u_linewidth, + uniforms::u_gapwidth, + uniforms::u_blur, + uniforms::u_offset, + uniforms::u_antialiasing, + uniforms::u_antialiasingmatrix, + uniforms::u_ratio, + uniforms::u_extra, + uniforms::u_color>> +{ +public: + using Program::Program; + + static UniformValues uniformValues(const style::LinePaintProperties&, + float pixelRatio, + const RenderTile&, + const TransformState&); +}; + +class LinePatternProgram : public Program< + shaders::line_pattern, + LineAttributes, + gl::Uniforms< + uniforms::u_matrix, + uniforms::u_opacity, + uniforms::u_linewidth, + uniforms::u_gapwidth, + uniforms::u_blur, + uniforms::u_offset, + uniforms::u_antialiasing, + uniforms::u_antialiasingmatrix, + uniforms::u_ratio, + uniforms::u_extra, + uniforms::u_pattern_tl_a, + uniforms::u_pattern_br_a, + uniforms::u_pattern_tl_b, + uniforms::u_pattern_br_b, + uniforms::u_pattern_size_a, + uniforms::u_pattern_size_b, + uniforms::u_fade, + uniforms::u_image>> +{ +public: + using Program::Program; + + static UniformValues uniformValues(const style::LinePaintProperties&, + float pixelRatio, + const RenderTile&, + const TransformState&, + const SpriteAtlasPosition& posA, + const SpriteAtlasPosition& posB); +}; + +class LineSDFProgram : public Program< + shaders::line_sdf, + LineAttributes, + gl::Uniforms< + uniforms::u_matrix, + uniforms::u_opacity, + uniforms::u_linewidth, + uniforms::u_gapwidth, + uniforms::u_blur, + uniforms::u_offset, + uniforms::u_antialiasing, + uniforms::u_antialiasingmatrix, + uniforms::u_ratio, + uniforms::u_extra, + uniforms::u_color, + uniforms::u_patternscale_a, + uniforms::u_patternscale_b, + uniforms::u_tex_y_a, + uniforms::u_tex_y_b, + uniforms::u_mix, + uniforms::u_sdfgamma, + uniforms::u_image>> +{ +public: + using Program::Program; + + static UniformValues uniformValues(const style::LinePaintProperties&, + float pixelRatio, + const RenderTile&, + const TransformState&, + const LinePatternPos& posA, + const LinePatternPos& posB, + float dashLineWidth, + float atlasWidth); +}; + +} // namespace mbgl |