Add outline pass to cubes

shaders/src/cube.glsl

@@ -3,11 +3,11 @@
 
 @ctype mat4 Mat4
 
-@vs vs
+@vs vs_cube
 in vec3 pos;
 in vec2 uv;
 
-layout(binding = 0) uniform VsParams {
+layout(binding = 0) uniform VsParamsCube {
     mat4 mvp;
     vec4 col;
 };
@@ -23,7 +23,7 @@ void main() {
 
 @end
 
-@fs fs
+@fs fs_cube
 in vec4 color;
 in vec2 tex_coord;
 
@@ -38,4 +38,4 @@ void main() {
 
 @end
 
-@program main vs fs
+@program cube vs_cube fs_cube

shaders/src/outline.glsl

@@ -0,0 +1,31 @@
+@header package shaders
+@header import sg "../../sokol/gfx"
+
+@ctype mat4 Mat4
+
+@vs vs_outline
+in vec3 pos;
+in vec2 uv;
+
+layout(binding = 0) uniform VsParamsOutline {
+    mat4 mvp;
+};
+
+void main() {
+    gl_Position = mvp * vec4(pos, 1);
+}
+@end
+
+@fs fs_outline
+layout(binding = 1) uniform FsParamsOutline {
+    vec4 col;
+};
+
+out vec4 frag_color;
+
+void main() {
+    frag_color = col;
+}
+@end
+
+@program outline vs_outline fs_outline