235 lines
9.0 KiB
C++
235 lines
9.0 KiB
C++
#pragma once
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#include <mbgl/shaders/mtl/common.hpp>
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#include <mbgl/shaders/mtl/shader_program.hpp>
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#include <mbgl/shaders/shader_source.hpp>
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#include <mbgl/shaders/symbol_layer_ubo.hpp>
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namespace mbgl {
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namespace shaders {
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template <>
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struct ShaderSource<BuiltIn::SymbolTextAndIconShader, gfx::Backend::Type::Metal> {
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static constexpr auto name = "SymbolTextAndIconShader";
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static constexpr auto vertexMainFunction = "vertexMain";
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static constexpr auto fragmentMainFunction = "fragmentMain";
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static const std::array<UniformBlockInfo, 5> uniforms;
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static const std::array<AttributeInfo, 9> attributes;
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static constexpr std::array<AttributeInfo, 0> instanceAttributes{};
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static const std::array<TextureInfo, 2> textures;
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static constexpr auto source = R"(
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#define SDF 1.0
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#define ICON 0.0
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struct VertexStage {
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float4 pos_offset [[attribute(5)]];
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float4 data [[attribute(6)]];
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float3 projected_pos [[attribute(7)]];
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float fade_opacity [[attribute(8)]];
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#if !defined(HAS_UNIFORM_u_fill_color)
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float4 fill_color [[attribute(9)]];
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#endif
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#if !defined(HAS_UNIFORM_u_halo_color)
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float4 halo_color [[attribute(10)]];
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#endif
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#if !defined(HAS_UNIFORM_u_opacity)
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float opacity [[attribute(11)]];
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#endif
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#if !defined(HAS_UNIFORM_u_halo_width)
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float halo_width [[attribute(12)]];
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#endif
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#if !defined(HAS_UNIFORM_u_halo_blur)
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float halo_blur [[attribute(13)]];
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#endif
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};
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struct FragmentStage {
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float4 position [[position, invariant]];
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#if !defined(HAS_UNIFORM_u_fill_color)
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half4 fill_color;
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#endif
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#if !defined(HAS_UNIFORM_u_halo_color)
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half4 halo_color;
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#endif
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half2 tex;
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#if !defined(HAS_UNIFORM_u_opacity)
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half opacity;
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#endif
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#if !defined(HAS_UNIFORM_u_halo_width)
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half halo_width;
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#endif
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#if !defined(HAS_UNIFORM_u_halo_blur)
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half halo_blur;
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#endif
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half gamma_scale;
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half fontScale;
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half fade_opacity;
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bool is_icon;
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};
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FragmentStage vertex vertexMain(thread const VertexStage vertx [[stage_in]],
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device const GlobalPaintParamsUBO& paintParams [[buffer(0)]],
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device const SymbolDrawableUBO& drawable [[buffer(1)]],
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device const SymbolTilePropsUBO& tileprops [[buffer(2)]],
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device const SymbolInterpolateUBO& interp [[buffer(3)]]) {
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const float2 a_pos = vertx.pos_offset.xy;
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const float2 a_offset = vertx.pos_offset.zw;
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const float2 a_tex = vertx.data.xy;
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const float2 a_size = vertx.data.zw;
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const float a_size_min = floor(a_size[0] * 0.5);
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const float is_sdf = a_size[0] - 2.0 * a_size_min;
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const float segment_angle = -vertx.projected_pos[2];
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float size;
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if (!tileprops.is_size_zoom_constant && !tileprops.is_size_feature_constant) {
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size = mix(a_size_min, a_size[1], tileprops.size_t) / 128.0;
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} else if (tileprops.is_size_zoom_constant && !tileprops.is_size_feature_constant) {
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size = a_size_min / 128.0;
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} else {
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size = tileprops.size;
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}
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const float4 projectedPoint = drawable.matrix * float4(a_pos, 0, 1);
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const float camera_to_anchor_distance = projectedPoint.w;
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// If the label is pitched with the map, layout is done in pitched space,
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// which makes labels in the distance smaller relative to viewport space.
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// We counteract part of that effect by multiplying by the perspective ratio.
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// If the label isn't pitched with the map, we do layout in viewport space,
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// which makes labels in the distance larger relative to the features around
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// them. We counteract part of that effect by dividing by the perspective ratio.
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const float distance_ratio = tileprops.pitch_with_map ?
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camera_to_anchor_distance / paintParams.camera_to_center_distance :
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paintParams.camera_to_center_distance / camera_to_anchor_distance;
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const float perspective_ratio = clamp(
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0.5 + 0.5 * distance_ratio,
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0.0, // Prevents oversized near-field symbols in pitched/overzoomed tiles
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4.0);
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size *= perspective_ratio;
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const float fontScale = size / 24.0;
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float symbol_rotation = 0.0;
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if (drawable.rotate_symbol) {
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// Point labels with 'rotation-alignment: map' are horizontal with respect to tile units
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// To figure out that angle in projected space, we draw a short horizontal line in tile
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// space, project it, and measure its angle in projected space.
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const float4 offsetProjectedPoint = drawable.matrix * float4(a_pos + float2(1, 0), 0, 1);
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const float2 a = projectedPoint.xy / projectedPoint.w;
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const float2 b = offsetProjectedPoint.xy / offsetProjectedPoint.w;
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symbol_rotation = atan2((b.y - a.y) / paintParams.aspect_ratio, b.x - a.x);
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}
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const float angle_sin = sin(segment_angle + symbol_rotation);
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const float angle_cos = cos(segment_angle + symbol_rotation);
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const float2x2 rotation_matrix = float2x2(angle_cos, -1.0 * angle_sin, angle_sin, angle_cos);
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const float4 projected_pos = drawable.label_plane_matrix * float4(vertx.projected_pos.xy, 0.0, 1.0);
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const float2 pos_rot = a_offset / 32.0 * fontScale;
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const float2 pos0 = projected_pos.xy / projected_pos.w + rotation_matrix * pos_rot;
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const float4 position = drawable.coord_matrix * float4(pos0, 0.0, 1.0);
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const float gamma_scale = position.w;
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const float2 fade_opacity = unpack_opacity(vertx.fade_opacity);
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const float fade_change = (fade_opacity[1] > 0.5) ? paintParams.symbol_fade_change : -paintParams.symbol_fade_change;
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const bool is_icon = (is_sdf == ICON);
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return {
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.position = position,
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.tex = half2(a_tex / (is_icon ? drawable.texsize_icon : drawable.texsize)),
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.gamma_scale = half(gamma_scale),
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.fontScale = half(fontScale),
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.fade_opacity = half(max(0.0, min(1.0, fade_opacity[0] + fade_change))),
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.is_icon = is_icon,
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#if !defined(HAS_UNIFORM_u_fill_color)
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.fill_color = half(unpack_mix_color(vertx.fill_color, interp.fill_color_t));
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#endif
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#if !defined(HAS_UNIFORM_u_halo_color)
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.halo_color = half(unpack_mix_color(vertx.halo_color, interp.halo_color_t));
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#endif
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#if !defined(HAS_UNIFORM_u_opacity)
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.opacity = half(unpack_mix_float(vertx.opacity, interp.opacity_t));
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#endif
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#if !defined(HAS_UNIFORM_u_halo_width)
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.halo_width = half(unpack_mix_float(vertx.halo_width, interp.halo_width_t));
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#endif
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#if !defined(HAS_UNIFORM_u_halo_blur)
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.halo_blur = half(unpack_mix_float(vertx.halo_blur, interp.halo_blur_t));
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#endif
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};
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}
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half4 fragment fragmentMain(FragmentStage in [[stage_in]],
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device const SymbolDrawableUBO& drawable [[buffer(1)]],
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device const SymbolTilePropsUBO& tileprops [[buffer(2)]],
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device const SymbolEvaluatedPropsUBO& props [[buffer(4)]],
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texture2d<float, access::sample> glyph_image [[texture(0)]],
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texture2d<float, access::sample> icon_image [[texture(1)]],
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sampler glyph_sampler [[sampler(0)]],
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sampler icon_sampler [[sampler(1)]]) {
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#if defined(OVERDRAW_INSPECTOR)
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return half4(1.0);
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#endif
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#if defined(HAS_UNIFORM_u_fill_color)
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const half4 fill_color = half4(tileprops.is_text ? props.text_fill_color : props.icon_fill_color);
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#else
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const half4 fill_color = in.fill_color;
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#endif
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#if defined(HAS_UNIFORM_u_halo_color)
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const half4 halo_color = half4(tileprops.is_text ? props.text_halo_color : props.icon_halo_color);
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#else
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const half4 halo_color = in.halo_color;
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#endif
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#if defined(HAS_UNIFORM_u_opacity)
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const half opacity = half(tileprops.is_text ? props.text_opacity : props.icon_opacity);
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#else
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const half opacity = in.opacity;
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#endif
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#if defined(HAS_UNIFORM_u_halo_width)
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const half halo_width = half(tileprops.is_text ? props.text_halo_width : props.icon_halo_width);
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#else
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const half halo_width = in.halo_width;
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#endif
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#if defined(HAS_UNIFORM_u_halo_blur)
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const half halo_blur = half(tileprops.is_text ? props.text_halo_blur : props.icon_halo_blur);
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#else
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const half halo_blur = in.halo_blur;
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#endif
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if (in.is_icon) {
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const float alpha = opacity * in.fade_opacity;
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return half4(icon_image.sample(icon_sampler, float2(in.tex)) * alpha);
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}
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const float EDGE_GAMMA = 0.105 / DEVICE_PIXEL_RATIO;
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const half4 color = tileprops.is_halo ? halo_color : fill_color;
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const float fontGamma = in.fontScale * drawable.gamma_scale;
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const float gamma = ((tileprops.is_halo ? (halo_blur * 1.19 / SDF_PX) : 0) + EDGE_GAMMA) / fontGamma;
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const float buff = tileprops.is_halo ? (6.0 - halo_width / in.fontScale) / SDF_PX : (256.0 - 64.0) / 256.0;
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const float dist = glyph_image.sample(glyph_sampler, float2(in.tex)).a;
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const float gamma_scaled = gamma * in.gamma_scale;
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const float alpha = smoothstep(buff - gamma_scaled, buff + gamma_scaled, dist);
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return half4(color * (alpha * opacity * in.fade_opacity));
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}
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)";
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};
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} // namespace shaders
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} // namespace mbgl
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