[tzsl] added texsize(id) which is equivalent to GLSL's textureSize(..…

…., 0). also added post_render graph to quad_renderer. it works but note that post_render should definitely depend on the main pass, which it doesnt

include/tz/ren/quad.hpp

@@ -81,6 +81,7 @@ namespace tz::ren
 				return {std::begin(default_targets), std::end(default_targets)};
 			}();
 		std::span<const tz::gpu::resource_handle> extra_resources = {};
+		tz::gpu::graph_handle post_render = tz::nullhand;
 		/// Any extra optional flags to specify?
 		quad_renderer_flag flags = static_cast<quad_renderer_flag>(0);
 		/// Custom fragment shader. Unless @ref quad_renderer_flag::custom_fragment_shader is specified, this value is ignored and a default fragment shader is used.

src/tz/ren/quad.cpp

@@ -145,6 +145,10 @@ namespace tz::ren
 
 		ren.graph = tz::gpu::create_graph();
 		tz::gpu::graph_add_pass(ren.graph, ren.main_pass);
+		if(info.post_render != tz::nullhand)
+		{
+			tz::gpu::graph_add_subgraph(ren.graph, info.post_render);
+		}
 		if(info.flags & quad_renderer_flag::graph_present_after)
 		{
 			tz::gpu::graph_add_pass(ren.graph, tz::gpu::present_pass);

tools/tzslc/tzsl.cpp

@@ -249,7 +249,7 @@ namespace tzslc
 			{
 				ret = "#pragma shader_stage(" + *beg + ")" + stage_define;
 			}
-			return ret + "\n" + "layout(binding = 1) uniform sampler2D tz_textures[];\n#define sample(id, uv) texture(tz_textures[id], uv)";
+			return ret + "\n" + "layout(binding = 1) uniform sampler2D tz_textures[];\n#define sample(id, uv) texture(tz_textures[id], uv)\n#define texsize(id) textureSize(tz_textures[id], 0)\n";
 		});
 
 		tzslc_assert(stage_specifier_count == 1, "Unexpected number of shader stage specifiers. Expected 1, got %zu", stage_specifier_count);