287 lines
8.4 KiB
C++
287 lines
8.4 KiB
C++
// Generated code, do not modify this file!
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#pragma once
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#include <mbgl/shaders/shader_source.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::LineSDFShader, gfx::Backend::Type::OpenGL> {
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static constexpr const char* name = "LineSDFShader";
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static constexpr const char* vertex = R"(// floor(127 / 2) == 63.0
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// the maximum allowed miter limit is 2.0 at the moment. the extrude normal is
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// stored in a byte (-128..127). we scale regular normals up to length 63, but
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// there are also "special" normals that have a bigger length (of up to 126 in
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// this case).
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// #define scale 63.0
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#define scale 0.015873016
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// We scale the distance before adding it to the buffers so that we can store
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// long distances for long segments. Use this value to unscale the distance.
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#define LINE_DISTANCE_SCALE 2.0
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layout (location = 0) in vec2 a_pos_normal;
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layout (location = 1) in vec4 a_data;
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layout (std140) uniform LineSDFUBO {
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highp mat4 u_matrix;
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highp vec2 u_units_to_pixels;
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highp vec2 u_patternscale_a;
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highp vec2 u_patternscale_b;
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mediump float u_ratio;
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lowp float u_device_pixel_ratio;
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highp float u_tex_y_a;
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highp float u_tex_y_b;
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highp float u_sdfgamma;
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highp float u_mix;
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};
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layout (std140) uniform LineSDFPropertiesUBO {
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highp vec4 u_color;
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lowp float u_blur;
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lowp float u_opacity;
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mediump float u_gapwidth;
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lowp float u_offset;
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mediump float u_width;
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lowp float u_floorwidth;
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highp vec2 pad1;
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};
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layout (std140) uniform LineSDFInterpolationUBO {
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lowp float u_color_t;
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lowp float u_blur_t;
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lowp float u_opacity_t;
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lowp float u_gapwidth_t;
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lowp float u_offset_t;
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lowp float u_width_t;
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lowp float u_floorwidth_t;
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highp float pad2;
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};
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out vec2 v_normal;
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out vec2 v_width2;
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out vec2 v_tex_a;
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out vec2 v_tex_b;
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out float v_gamma_scale;
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#ifndef HAS_UNIFORM_u_color
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layout (location = 2) in highp vec4 a_color;
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out highp vec4 color;
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#endif
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#ifndef HAS_UNIFORM_u_blur
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layout (location = 3) in lowp vec2 a_blur;
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out lowp float blur;
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#endif
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#ifndef HAS_UNIFORM_u_opacity
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layout (location = 4) in lowp vec2 a_opacity;
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out lowp float opacity;
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#endif
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#ifndef HAS_UNIFORM_u_gapwidth
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layout (location = 5) in mediump vec2 a_gapwidth;
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#endif
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#ifndef HAS_UNIFORM_u_offset
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layout (location = 6) in lowp vec2 a_offset;
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#endif
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#ifndef HAS_UNIFORM_u_width
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layout (location = 7) in mediump vec2 a_width;
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out mediump float width;
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#endif
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#ifndef HAS_UNIFORM_u_floorwidth
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layout (location = 8) in lowp vec2 a_floorwidth;
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out lowp float floorwidth;
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#endif
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void main() {
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#ifndef HAS_UNIFORM_u_color
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color = unpack_mix_color(a_color, u_color_t);
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#else
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highp vec4 color = u_color;
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#endif
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#ifndef HAS_UNIFORM_u_blur
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blur = unpack_mix_vec2(a_blur, u_blur_t);
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#else
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lowp float blur = u_blur;
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#endif
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#ifndef HAS_UNIFORM_u_opacity
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opacity = unpack_mix_vec2(a_opacity, u_opacity_t);
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#else
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lowp float opacity = u_opacity;
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#endif
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#ifndef HAS_UNIFORM_u_gapwidth
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mediump float gapwidth = unpack_mix_vec2(a_gapwidth, u_gapwidth_t);
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#else
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mediump float gapwidth = u_gapwidth;
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#endif
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#ifndef HAS_UNIFORM_u_offset
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lowp float offset = unpack_mix_vec2(a_offset, u_offset_t);
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#else
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lowp float offset = u_offset;
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#endif
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#ifndef HAS_UNIFORM_u_width
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width = unpack_mix_vec2(a_width, u_width_t);
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#else
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mediump float width = u_width;
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#endif
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#ifndef HAS_UNIFORM_u_floorwidth
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floorwidth = unpack_mix_vec2(a_floorwidth, u_floorwidth_t);
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#else
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lowp float floorwidth = u_floorwidth;
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#endif
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// the distance over which the line edge fades out.
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// Retina devices need a smaller distance to avoid aliasing.
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float ANTIALIASING = 1.0 / u_device_pixel_ratio / 2.0;
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vec2 a_extrude = a_data.xy - 128.0;
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float a_direction = mod(a_data.z, 4.0) - 1.0;
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float a_linesofar = (floor(a_data.z / 4.0) + a_data.w * 64.0) * LINE_DISTANCE_SCALE;
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vec2 pos = floor(a_pos_normal * 0.5);
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// x is 1 if it's a round cap, 0 otherwise
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// y is 1 if the normal points up, and -1 if it points down
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// We store these in the least significant bit of a_pos_normal
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mediump vec2 normal = a_pos_normal - 2.0 * pos;
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normal.y = normal.y * 2.0 - 1.0;
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v_normal = normal;
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// these transformations used to be applied in the JS and native code bases.
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// moved them into the shader for clarity and simplicity.
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gapwidth = gapwidth / 2.0;
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float halfwidth = width / 2.0;
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offset = -1.0 * offset;
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float inset = gapwidth + (gapwidth > 0.0 ? ANTIALIASING : 0.0);
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float outset = gapwidth + halfwidth * (gapwidth > 0.0 ? 2.0 : 1.0) + (halfwidth == 0.0 ? 0.0 : ANTIALIASING);
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// Scale the extrusion vector down to a normal and then up by the line width
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// of this vertex.
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mediump vec2 dist =outset * a_extrude * scale;
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// Calculate the offset when drawing a line that is to the side of the actual line.
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// We do this by creating a vector that points towards the extrude, but rotate
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// it when we're drawing round end points (a_direction = -1 or 1) since their
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// extrude vector points in another direction.
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mediump float u = 0.5 * a_direction;
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mediump float t = 1.0 - abs(u);
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mediump vec2 offset2 = offset * a_extrude * scale * normal.y * mat2(t, -u, u, t);
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vec4 projected_extrude = u_matrix * vec4(dist / u_ratio, 0.0, 0.0);
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gl_Position = u_matrix * vec4(pos + offset2 / u_ratio, 0.0, 1.0) + projected_extrude;
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// calculate how much the perspective view squishes or stretches the extrude
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float extrude_length_without_perspective = length(dist);
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float extrude_length_with_perspective = length(projected_extrude.xy / gl_Position.w * u_units_to_pixels);
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v_gamma_scale = extrude_length_without_perspective / extrude_length_with_perspective;
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v_tex_a = vec2(a_linesofar * u_patternscale_a.x / floorwidth, normal.y * u_patternscale_a.y + u_tex_y_a);
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v_tex_b = vec2(a_linesofar * u_patternscale_b.x / floorwidth, normal.y * u_patternscale_b.y + u_tex_y_b);
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v_width2 = vec2(outset, inset);
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}
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)";
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static constexpr const char* fragment = R"(
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layout (std140) uniform LineSDFUBO {
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highp mat4 u_matrix;
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highp vec2 u_units_to_pixels;
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highp vec2 u_patternscale_a;
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highp vec2 u_patternscale_b;
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mediump float u_ratio;
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lowp float u_device_pixel_ratio;
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highp float u_tex_y_a;
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highp float u_tex_y_b;
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highp float u_sdfgamma;
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highp float u_mix;
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};
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layout (std140) uniform LineSDFPropertiesUBO {
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highp vec4 u_color;
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lowp float u_blur;
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lowp float u_opacity;
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mediump float u_gapwidth;
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lowp float u_offset;
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mediump float u_width;
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lowp float u_floorwidth;
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highp vec2 pad1;
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};
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layout (std140) uniform LineSDFInterpolationUBO {
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lowp float u_color_t;
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lowp float u_blur_t;
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lowp float u_opacity_t;
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lowp float u_gapwidth_t;
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lowp float u_offset_t;
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lowp float u_width_t;
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lowp float u_floorwidth_t;
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highp float pad2;
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};
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uniform sampler2D u_image;
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in vec2 v_normal;
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in vec2 v_width2;
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in vec2 v_tex_a;
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in vec2 v_tex_b;
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in float v_gamma_scale;
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#ifndef HAS_UNIFORM_u_color
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in highp vec4 color;
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#endif
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#ifndef HAS_UNIFORM_u_blur
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in lowp float blur;
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#endif
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#ifndef HAS_UNIFORM_u_opacity
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in lowp float opacity;
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#endif
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#ifndef HAS_UNIFORM_u_width
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in mediump float width;
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#endif
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#ifndef HAS_UNIFORM_u_floorwidth
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in lowp float floorwidth;
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#endif
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void main() {
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#ifdef HAS_UNIFORM_u_color
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highp vec4 color = u_color;
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#endif
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#ifdef HAS_UNIFORM_u_blur
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lowp float blur = u_blur;
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#endif
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#ifdef HAS_UNIFORM_u_opacity
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lowp float opacity = u_opacity;
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#endif
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#ifdef HAS_UNIFORM_u_width
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mediump float width = u_width;
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#endif
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#ifdef HAS_UNIFORM_u_floorwidth
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lowp float floorwidth = u_floorwidth;
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#endif
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// Calculate the distance of the pixel from the line in pixels.
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float dist = length(v_normal) * v_width2.s;
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// Calculate the antialiasing fade factor. This is either when fading in
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// the line in case of an offset line (v_width2.t) or when fading out
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// (v_width2.s)
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float blur2 = (blur + 1.0 / u_device_pixel_ratio) * v_gamma_scale;
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float alpha = clamp(min(dist - (v_width2.t - blur2), v_width2.s - dist) / blur2, 0.0, 1.0);
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float sdfdist_a = texture(u_image, v_tex_a).a;
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float sdfdist_b = texture(u_image, v_tex_b).a;
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float sdfdist = mix(sdfdist_a, sdfdist_b, u_mix);
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alpha *= smoothstep(0.5 - u_sdfgamma / floorwidth, 0.5 + u_sdfgamma / floorwidth, sdfdist);
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fragColor = color * (alpha * opacity);
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#ifdef OVERDRAW_INSPECTOR
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fragColor = vec4(1.0);
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#endif
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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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