Compile shaders in build.zig

assets/shaders/gui_text.frag

@@ -3,6 +3,8 @@
 #extension GL_EXT_scalar_block_layout : require
 #extension GL_EXT_shader_16bit_storage : require
 
+layout(location = 0) out vec4 fragColor;
+
 uint calcRootCode(float y1, float y2, float y3) {
     uint i1 = floatBitsToUint(y1) >> 31U;
     uint i2 = floatBitsToUint(y2) >> 30U;
@@ -13,3 +15,7 @@ uint calcRootCode(float y1, float y2, float y3) {
 
     return ((0x2E74U >> shift) & 0x0101U);
 }
+
+void main() {
+    fragColor = vec4(1.0, 0.0, 1.0, 1.0);
+}

assets/shaders/gui_text.vert

@@ -8,3 +8,7 @@ layout(location = 1) in vec4 texCoordEM_band_flags;
 layout(location = 2) in vec4 jacobian;
 layout(location = 3) in vec4 scale_offset;
 layout(location = 4) in vec4 color;
+
+void main() {
+    gl_Position = vec4(0.0, 0.0, 0.0, 1.0);
+}