Fixed shadows not respecting offset

include/render/fx_renderer/shaders.h

@@ -91,6 +91,7 @@ struct box_shadow_shader {
 	GLint pos_attrib;
 	GLint position;
 	GLint size;
+	GLint offset;
 	GLint blur_sigma;
 	GLint corner_radius;
 };

render/fx_renderer/fx_pass.c

@@ -487,6 +487,7 @@ void fx_render_pass_add_box_shadow(struct fx_gles_render_pass *pass,
 	glUniform1f(renderer->shaders.box_shadow.blur_sigma, shadow_data->blur_sigma);
 	glUniform1f(renderer->shaders.box_shadow.corner_radius, options->corner_radius);
 	glUniform2f(renderer->shaders.box_shadow.size, shadow_box.width, shadow_box.height);
+	glUniform2f(renderer->shaders.box_shadow.offset, options->shadow_data->offset_x, options->shadow_data->offset_y);
 	glUniform2f(renderer->shaders.box_shadow.position, shadow_box.x, shadow_box.y);
 
 	render(&shadow_box, &render_region, renderer->shaders.box_shadow.pos_attrib);

render/fx_renderer/gles2/shaders/box_shadow.frag

@@ -11,6 +11,7 @@ varying vec2 v_texcoord;
 
 uniform vec2 position;
 uniform vec2 size;
+uniform vec2 offset;
 uniform float blur_sigma;
 uniform float corner_radius;
 
@@ -80,7 +81,10 @@ void main() {
     shadow_alpha += (random() - 0.5) / 128.0;
 
     // get the window alpha so we can render around the window
-    float window_alpha = 1.0 - smoothstep(-1.0, 1.0, roundRectSDF((size * 0.5) - blur_sigma, position + blur_sigma, corner_radius));
+    float window_alpha = 1.0 - smoothstep(-1.0, 1.0,
+        roundRectSDF((size * 0.5) - blur_sigma,
+            vec2(position.x + blur_sigma - offset.x, position.y + blur_sigma - offset.y),
+            corner_radius));
 
     gl_FragColor = vec4(v_color.rgb, shadow_alpha * (1.0 - window_alpha));
 }

render/fx_renderer/shaders.c

@@ -196,6 +196,7 @@ bool link_box_shadow_program(struct box_shadow_shader *shader) {
 	shader->pos_attrib = glGetAttribLocation(prog, "pos");
 	shader->position = glGetUniformLocation(prog, "position");
 	shader->size = glGetUniformLocation(prog, "size");
+	shader->offset = glGetUniformLocation(prog, "offset");
 	shader->blur_sigma = glGetUniformLocation(prog, "blur_sigma");
 	shader->corner_radius = glGetUniformLocation(prog, "corner_radius");