Topic/atlas tex 2d (#1194)

Co-authored-by: mwilsnd <mwilsnd@gmail.com>

shaders/drawable.background_pattern.fragment.glsl

@@ -0,0 +1,38 @@
+layout (std140) uniform BackgroundLayerUBO {
+    highp vec2 u_pattern_tl_a;
+    highp vec2 u_pattern_br_a;
+    highp vec2 u_pattern_tl_b;
+    highp vec2 u_pattern_br_b;
+    highp vec2 u_texsize;
+    highp vec2 u_pattern_size_a;
+    highp vec2 u_pattern_size_b;
+    highp vec2 u_pixel_coord_upper;
+    highp vec2 u_pixel_coord_lower;
+    highp float u_tile_units_to_pixels;
+    highp float u_scale_a;
+    highp float u_scale_b;
+    highp float u_mix;
+    highp float u_opacity;
+    highp float pad;
+};
+
+uniform sampler2D u_image;
+
+in mediump vec2 v_pos_a;
+in mediump vec2 v_pos_b;
+
+void main() {
+    vec2 imagecoord = mod(v_pos_a, 1.0);
+    vec2 pos = mix(u_pattern_tl_a / u_texsize, u_pattern_br_a / u_texsize, imagecoord);
+    vec4 color1 = texture(u_image, pos);
+
+    vec2 imagecoord_b = mod(v_pos_b, 1.0);
+    vec2 pos2 = mix(u_pattern_tl_b / u_texsize, u_pattern_br_b / u_texsize, imagecoord_b);
+    vec4 color2 = texture(u_image, pos2);
+
+    fragColor = mix(color1, color2, u_mix) * u_opacity;
+
+#ifdef OVERDRAW_INSPECTOR
+    fragColor = vec4(1.0);
+#endif
+}

shaders/drawable.background_pattern.vertex.glsl

@@ -0,0 +1,31 @@
+layout (std140) uniform BackgroundDrawableUBO {
+    highp mat4 u_matrix;
+};
+layout (std140) uniform BackgroundLayerUBO {
+    highp vec2 u_pattern_tl_a;
+    highp vec2 u_pattern_br_a;
+    highp vec2 u_pattern_tl_b;
+    highp vec2 u_pattern_br_b;
+    highp vec2 u_texsize;
+    highp vec2 u_pattern_size_a;
+    highp vec2 u_pattern_size_b;
+    highp vec2 u_pixel_coord_upper;
+    highp vec2 u_pixel_coord_lower;
+    highp float u_tile_units_to_pixels;
+    highp float u_scale_a;
+    highp float u_scale_b;
+    highp float u_mix;
+    highp float u_opacity;
+    highp float pad;
+};
+
+layout (location = 0) in vec2 a_pos;
+out mediump vec2 v_pos_a;
+out mediump vec2 v_pos_b;
+
+void main() {
+    gl_Position = u_matrix * vec4(a_pos, 0, 1);
+
+    v_pos_a = get_pattern_pos(u_pixel_coord_upper, u_pixel_coord_lower, u_scale_a * u_pattern_size_a, u_tile_units_to_pixels, a_pos);
+    v_pos_b = get_pattern_pos(u_pixel_coord_upper, u_pixel_coord_lower, u_scale_b * u_pattern_size_b, u_tile_units_to_pixels, a_pos);
+}

shaders/manifest.json

@@ -6,6 +6,13 @@
         "glsl_frag": "drawable.background.fragment.glsl",
         "uses_ubos": true
     },
+    {
+        "name": "BackgroundPatternShader",
+        "header": "drawable_background_pattern",
+        "glsl_vert": "drawable.background_pattern.vertex.glsl",
+        "glsl_frag": "drawable.background_pattern.fragment.glsl",
+        "uses_ubos": true
+    },
     {
         "name": "CircleShader",
         "header": "drawable_circle",