MapLibreParticleLab/shaders/drawable.fill_pattern.vertex.glsl

layout (std140) uniform FillPatternDrawableUBO {
    highp mat4 u_matrix;
    highp vec4 u_scale;
    highp vec2 u_pixel_coord_upper;
    highp vec2 u_pixel_coord_lower;
    highp vec2 u_texsize;
    highp float pad1;
    highp float pad2;
};
layout (std140) uniform FillPatternEvaluatedPropsUBO {
    highp float u_opacity;
    highp float u_fade;
    highp float padding_props1;
    highp float padding_props2;
};
layout (std140) uniform FillPatternInterpolateUBO {
    highp float u_pattern_from_t;
    highp float u_pattern_to_t;
    highp float u_opacity_t;
    highp float u_padding_interp1;
};
layout (std140) uniform FillPatternTilePropsUBO {
    highp vec4 u_pattern_from;
    highp vec4 u_pattern_to;
};

layout (location = 0) in vec2 a_pos;

out vec2 v_pos_a;
out vec2 v_pos_b;

#pragma mapbox: define lowp float opacity
#pragma mapbox: define lowp vec4 pattern_from
#pragma mapbox: define lowp vec4 pattern_to

void main() {
    #pragma mapbox: initialize lowp float opacity
    #pragma mapbox: initialize mediump vec4 pattern_from
    #pragma mapbox: initialize mediump vec4 pattern_to

    vec2 pattern_tl_a = pattern_from.xy;
    vec2 pattern_br_a = pattern_from.zw;
    vec2 pattern_tl_b = pattern_to.xy;
    vec2 pattern_br_b = pattern_to.zw;

    float pixelRatio = u_scale.x;
    float tileZoomRatio = u_scale.y;
    float fromScale = u_scale.z;
    float toScale = u_scale.w;

    vec2 display_size_a = vec2((pattern_br_a.x - pattern_tl_a.x) / pixelRatio, (pattern_br_a.y - pattern_tl_a.y) / pixelRatio);
    vec2 display_size_b = vec2((pattern_br_b.x - pattern_tl_b.x) / pixelRatio, (pattern_br_b.y - pattern_tl_b.y) / pixelRatio);
    gl_Position = u_matrix * vec4(a_pos, 0, 1);

    v_pos_a = get_pattern_pos(u_pixel_coord_upper, u_pixel_coord_lower, fromScale * display_size_a, tileZoomRatio, a_pos);
    v_pos_b = get_pattern_pos(u_pixel_coord_upper, u_pixel_coord_lower, toScale * display_size_b, tileZoomRatio, a_pos);
}