use cmdDrawIndexedIndirect instead of normal draw

assets/shaders/shader.frag

@@ -1,11 +1,12 @@
 #version 450
 
-layout(location = 0) in vec2 fragTexCoord;
+layout(location = 0) in vec3 fragTexCoord;
 
 layout(location = 0) out vec4 outColor;
 
-layout(binding = 1) uniform sampler2D texSampler;
+// TODO: array of normal samplers instead using indexed descriptor sets
+layout(binding = 0) uniform sampler2D texSampler;
 
 void main() {
-    outColor = texture(texSampler, fragTexCoord);
+    outColor = texture(texSampler, fragTexCoord.xy);
 }

assets/shaders/shader.vert

@@ -1,21 +1,22 @@
 #version 450
 
-layout(binding = 0) uniform UniformBufferObject {
-    mat4 transform;
-} ubo;
-
-//push constants block
+// Push constants block
 layout(push_constant) uniform push_constants
 {
 	mat4 projection_view;
 } camera;
 
+// Vertex attributes
 layout(location = 0) in vec3 inPosition;
 layout(location = 1) in vec2 inTexCoord;
 
-layout(location = 0) out vec2 fragTexCoord;
+// Instanced attributes
+layout(location = 2) in int instanceTexIndex;
+layout(location = 3) in mat4 instanceTransform;
+
+layout(location = 0) out vec3 fragTexCoord;
 
 void main() {
-    gl_Position = camera.projection_view * ubo.transform * vec4(inPosition, 1.0);
-    fragTexCoord = inTexCoord;
+    gl_Position = camera.projection_view * instanceTransform * vec4(inPosition, 1.0);
+    fragTexCoord = vec3(inTexCoord, instanceTexIndex);
 }