Update shaders

samples/01-physics/core/shaders/default.shader

@@ -101,7 +101,7 @@ bgfx_shaders = {
 			vec2 v_texcoord0 : TEXCOORD0 = vec2(0.0, 0.0);
 			vec4 v_color0    : COLOR0 = vec4(0.0, 0.0, 0.0, 0.0);
 
-			vec2 a_position  : POSITION;
+			vec3 a_position  : POSITION;
 			vec2 a_texcoord0 : TEXCOORD0;
 			vec4 a_color0    : COLOR0;
 		"
@@ -114,7 +114,7 @@ bgfx_shaders = {
 		vs_code = "
 			void main()
 			{
-				gl_Position = mul(u_modelViewProj, vec4(a_position, 0.0, 1.0));
+				gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0));
 			#ifdef DIFFUSE_MAP
 				v_texcoord0 = a_texcoord0;
 			#endif // DIFFUSE_MAP