work on ssao

src/editor/textureDebugger.jai

@@ -7,7 +7,7 @@ theme_ptr         : GR.Overall_Theme;
 
 current_pipeline : s32 = 0;
 current_slot     : s32 = 0;
-pipeline_names   : []string = .["shadowmap", "reflection", "main", "position", "normal"];
+pipeline_names   : []string = .["shadowmap", "reflection", "main", "position", "normal", "ssao"];
 
 draw_subwindow_texture_debug :: (state: *GR.Subwindow_State, r: GR.Rect, data: *void) {
     r2 := r;
@@ -29,6 +29,7 @@ draw_subwindow_texture_debug :: (state: *GR.Subwindow_State, r: GR.Rect, data: *
         case 2; image = g_rendertex;
         case 3; image = g_gbuf_position;
         case 4; image = g_gbuf_normal;
+        case 5; image = g_ssaobuf;
     }
     
     uiTex.tex = image; 

src/main.jai

@@ -114,6 +114,7 @@ init_after_asset_pack :: () {
     init_editor();
     game_init();
     lworlds();
+    init_rendering();
     load_post_process_from_pack();
 }
 

src/rendering/backend_sokol.jai

@@ -256,6 +256,19 @@ backend_process_command_buckets :: () {
     current_trile_offset_index = 0; // This is not optimal, but it is nice and simple.
 
     // --- TODO: Do SSAO pass here:
+    sg_begin_pass(*(sg_pass.{ action = state.pass_action_clear, attachments = g_ssao_attachments}));
+    sg_apply_pipeline(gPipelines.ssao.pipeline);
+    gPipelines.ssao.bind.images[0] = g_gbuf_position;
+    gPipelines.ssao.bind.images[1] = g_gbuf_normal;
+    gPipelines.ssao.bind.images[2] = g_gbuf_position;
+    sg_apply_bindings(*gPipelines.ssao.bind);
+    ssao_fs_uniform : Ssao_Fs_Params;
+    mvp := create_viewproj(*camera);
+    ssao_fs_uniform.projection = mvp.floats;
+    ssao_fs_uniform.samples    = g_ssao_samples;
+    sg_apply_uniforms(UB_ssao_fs_params, *(sg_range.{ ptr = *ssao_fs_uniform, size = size_of(type_of(ssao_fs_uniform)) }));
+    sg_draw(0, 6, 1);    
+    sg_end_pass();
 
     // 5. Main pass
 	sg_begin_pass(*(sg_pass.{ action = state.pass_action_clear, attachments = g_rendertex_attachments}));

src/rendering/core.jai

@@ -2,15 +2,14 @@
 
 #load "backend.jai";
 
+init_rendering :: () {
+    init_ssao();
+}
+
 // Core rendering function, runs several passes.
 render :: () {
     tasks_to_commands();
     process_command_buckets();
-    // // @ToDo: Consider a depth pre-pass here? Research required.
-    // shadow_pass();   
-    // reflection_pass();
-    // forward_pass();
-    // // @ToDo: Post-processing.
 }
 
 #scope_file

src/rendering/pipelines.jai

@@ -24,6 +24,9 @@ g_gbuf_depth            : sg_image;
 g_gbuf_attachments      : sg_attachments;
 
 g_ssaobuf               : sg_image;
+g_ssao_noise_buf        : sg_image;
+g_ssaobuf_depth         : sg_image;
+g_ssao_attachments      : sg_attachments;
 
 gPipelines : struct {
     // G-Buffer generation for SSAO and other effects
@@ -43,10 +46,14 @@ gPipelines : struct {
     // Renders sets of triles
     trile  : Pipeline_Binding;
 
-    // Renders the ground plane.
+    // Renders the ground plane. (just water)
     plane  : Pipeline_Binding;
 
+    // Post-processing pipeline
     postprocess : Pipeline_Binding;
+
+    // Renders the SSAO texture using things from the gbuffer pass.
+    ssao: Pipeline_Binding;
 }
 
 create_final_image :: () {
@@ -117,6 +124,7 @@ create_pipelines :: () {
     create_sky_pipeline();
     create_plane_pipeline();
     create_postprocess_pipeline();
+    create_ssao_pipeline();
     
     create_shadowmap_image();
     create_final_image();
@@ -669,6 +677,101 @@ create_postprocess_pipeline :: () {
 
 }
 
+create_ssao_pipeline :: () {
+    platconf := get_plat_conf();
+    pipeline: sg_pipeline_desc;
+    shader_desc := ssao_shader_desc(sg_query_backend());
+    pipeline.shader = sg_make_shader(*shader_desc);
+
+    pipeline.layout.attrs[ATTR_ssao_position] = .{ format = .FLOAT2 };
+    pipeline.layout.attrs[ATTR_ssao_uv]       = .{ format = .FLOAT2 };
+    pipeline.index_type = .UINT16;
+
+    color_state := sg_color_target_state.{
+        blend = .{
+            enabled = true,
+            src_factor_rgb = .SRC_ALPHA,
+            dst_factor_rgb = .ONE_MINUS_SRC_ALPHA
+        }
+    };
+
+    pipeline.color_count = 1;
+    pipeline.depth = .{
+            write_enabled = true,
+            compare = .LESS_EQUAL,
+            pixel_format = .DEPTH
+    };
+    pipeline.colors[0] = color_state;
+
+    gPipelines.ssao.pipeline = sg_make_pipeline(*pipeline);
+
+    quad_vertices : [16]float = .[
+        -1.0,  1.0, 0.0, flip_if_plat(1.0), // top-let
+        -1.0, -1.0, 0.0, flip_if_plat(0.0), // bottom-let
+         1.0, -1.0, 1.0, flip_if_plat(0.0), // bottom-right
+         1.0,  1.0, 1.0, flip_if_plat(1.0), // top-right
+    ];
+    quad_indices  : [6]u16 = .[
+        0, 1, 2, 0, 2, 3
+    ];
+
+    vbuffer := sg_buffer_desc.{ size = size_of(float) * 16, data = .{
+        ptr = quad_vertices.data,
+        size = 16 * 4
+    }};
+    ibuffer := sg_buffer_desc.{ size = size_of(u16) * 6, data = .{
+        ptr = quad_indices.data,
+        size = 6 * 2
+    },
+    type = .INDEXBUFFER,
+    };
+
+    gPipelines.ssao.bind.vertex_buffers[0] = sg_make_buffer(*vbuffer);
+    gPipelines.ssao.bind.index_buffer = sg_make_buffer(*ibuffer);
+    gPipelines.ssao.bind.samplers[0] = sg_make_sampler(*(sg_sampler_desc.{
+        wrap_u = .CLAMP_TO_EDGE,
+        wrap_v = .CLAMP_TO_EDGE,
+        min_filter = .NEAREST,
+        mag_filter = .NEAREST,
+    }));
+
+    w,h := get_render_size();
+    img_desc := sg_image_desc.{
+        width = w,
+        height = h,
+        render_target = true,
+    };
+    img_desc.sample_count = 1;
+    g_ssaobuf = sg_make_image(*img_desc);
+    img_desc = sg_image_desc.{
+        width = w,
+        height = h,
+        pixel_format = .DEPTH,
+        render_target = true,
+    };
+    img_desc.sample_count = 1;
+    g_ssaobuf_depth = sg_make_image(*img_desc);
+
+	attachmentsDesc := sg_attachments_desc.{
+	    colors[0].image = g_ssaobuf,
+        depth_stencil.image = g_ssaobuf_depth
+	};
+    sg_destroy_attachments(g_ssao_attachments);
+    g_ssao_attachments = sg_make_attachments(*attachmentsDesc);
+
+    imgdata : sg_image_data;
+    imgdata.subimage[0][0] = .{g_ssao_noise.data, cast(u64) (16*4)};
+    texdesc : sg_image_desc = .{
+        render_target = false,
+        width         = 4,
+        height        = 4,  
+        pixel_format  = sg_pixel_format.RGBA8,
+        sample_count  = 1,
+        data          = imgdata
+    };
+    g_ssao_noise_buf = sg_make_image(*texdesc);
+}
+
 init_plane_textures :: () {
     gPipelines.plane.bind.images[3] = create_texture_from_pack("./resources/utiltex/water.png");
 }

src/rendering/rendering.jai

@@ -8,6 +8,7 @@
 */
 
 #load "sky.jai";
+#load "ssao.jai";
 #load "core.jai";
 #load "tasks.jai";
 #load "camera.jai";

src/rendering/ssao.jai

@@ -0,0 +1,33 @@
+#scope_file
+
+Random :: #import "Random";
+
+#scope_export
+
+g_ssao_samples : [64][4]float;
+g_ssao_noise   : [16*4]float;
+
+init_ssao :: () {
+    for 0..63 {
+        vec := Vector3.{
+            Random.random_get_zero_to_one() * 2 - 1,
+            Random.random_get_zero_to_one() * 2 - 1,
+            Random.random_get_zero_to_one(),
+        };
+        vec = normalize(vec);
+        vec *= Random.random_get_zero_to_one();
+        scale := cast(float)it/64.0;
+        scale = lerp(0.1, 1.0, scale*scale);
+        vec *= scale;
+        g_ssao_samples[it][0] = vec.x;
+        g_ssao_samples[it][1] = vec.y;
+        g_ssao_samples[it][2] = vec.z;
+        g_ssao_samples[it][3] = 0;
+    }
+    for 0..15 {
+        g_ssao_noise[it*4+0] = Random.random_get_zero_to_one() * 2 - 1; 
+        g_ssao_noise[it*4+1] = Random.random_get_zero_to_one() * 2 - 1; 
+        g_ssao_noise[it*4+2] = 0.0; 
+        g_ssao_noise[it*4+3] = 0.0; 
+    }
+}

src/shaders/jai/shader_ssao.jai

@@ -0,0 +1,749 @@
+/*
+    #version:1# (machine generated, don't edit!)
+
+    Generated by sokol-shdc (https://github.com/floooh/sokol-tools)
+
+    Cmdline:
+        sokol-shdc -i shader_ssao.glsl -o ./jai/shader_ssao.jai -l glsl430:glsl300es:metal_macos -f sokol_jai
+
+    Overview:
+    =========
+    Shader program: 'ssao':
+        Get shader desc: ssao_shader_desc(sg_query_backend())
+        Vertex Shader: vs_ssao
+        Fragment Shader: fs_ssao
+        Attributes:
+            ATTR_ssao_position => 0
+            ATTR_ssao_uv => 1
+    Bindings:
+        Uniform block 'ssao_fs_params':
+            Jai struct: Ssao_Fs_Params
+            Bind slot: UB_ssao_fs_params => 1
+        Image 'g_position':
+            Image type: ._2D
+            Sample type: .FLOAT
+            Multisampled: false
+            Bind slot: IMG_g_position => 0
+        Image 'g_normal':
+            Image type: ._2D
+            Sample type: .FLOAT
+            Multisampled: false
+            Bind slot: IMG_g_normal => 1
+        Image 'tex_noise':
+            Image type: ._2D
+            Sample type: .FLOAT
+            Multisampled: false
+            Bind slot: IMG_tex_noise => 2
+        Sampler 'ssao_smp':
+            Type: .FILTERING
+            Bind slot: SMP_ssao_smp => 0
+*/
+ATTR_ssao_position :: 0;
+ATTR_ssao_uv :: 1;
+UB_ssao_fs_params :: 1;
+IMG_g_position :: 0;
+IMG_g_normal :: 1;
+IMG_tex_noise :: 2;
+SMP_ssao_smp :: 0;
+Ssao_Fs_Params :: struct {
+    projection: [16]float;
+    samples: [64][4]float;
+};
+/*
+    #version 430
+
+    layout(location = 0) in vec2 position;
+    layout(location = 0) out vec2 quad_uv;
+    layout(location = 1) in vec2 uv;
+
+    void main()
+    {
+        gl_Position = vec4(position, 0.0, 1.0);
+        quad_uv = uv;
+    }
+
+*/
+vs_ssao_source_glsl430 := u8.[
+    0x23,0x76,0x65,0x72,0x73,0x69,0x6f,0x6e,0x20,0x34,0x33,0x30,0x0a,0x0a,0x6c,0x61,
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+];
+/*
+    #version 430
+
+    vec4 _204;
+
+    uniform vec4 ssao_fs_params[68];
+    layout(binding = 16) uniform sampler2D g_position_ssao_smp;
+    layout(binding = 17) uniform sampler2D g_normal_ssao_smp;
+    layout(binding = 18) uniform sampler2D tex_noise_ssao_smp;
+
+    layout(location = 0) in vec2 quad_uv;
+    layout(location = 0) out vec4 out_color;
+
+    void main()
+    {
+        vec4 _25 = texture(g_position_ssao_smp, quad_uv);
+        vec3 _26 = _25.xyz;
+        vec3 _35 = normalize(texture(g_normal_ssao_smp, quad_uv).xyz);
+        vec3 _51 = normalize(texture(tex_noise_ssao_smp, quad_uv * vec2(320.0, 180.0)).xyz);
+        vec3 _60 = normalize(_51 - (_35 * dot(_51, _35)));
+        mat3 _85 = mat3(_60, cross(_35, _60), _35);
+        float occlusion = 0.0;
+        for (int i = 0; i < 64; i++)
+        {
+            vec3 _119 = _26 + (_85 * ssao_fs_params[i * 1 + 4].xyz);
+            vec4 _131 = mat4(ssao_fs_params[0], ssao_fs_params[1], ssao_fs_params[2], ssao_fs_params[3]) * vec4(_119, 1.0);
+            vec2 _138 = _131.xy / vec2(_131.w);
+            vec4 _192;
+            _192.x = _138.x;
+            _192.y = _138.y;
+            vec2 _150 = (_192.xy * 0.5) + vec2(0.5);
+            vec4 _196;
+            _196.x = _150.x;
+            _196.y = _150.y;
+            vec4 _161 = texture(g_position_ssao_smp, _196.xy);
+            float _163 = _161.z;
+            occlusion += (float(_163 >= _119.z) * smoothstep(0.0, 1.0, 1.0 - (_25.z - _163)));
+        }
+        float _182 = occlusion;
+        float _185 = 1.0 - (_182 * 0.015625);
+        occlusion = _185;
+        out_color = vec4(_185, _185, _185, 1.0);
+    }
+
+*/
+fs_ssao_source_glsl430 := u8.[
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+    0x7d,0x0a,0x0a,0x00,
+];
+/*
+    #version 300 es
+
+    layout(location = 0) in vec2 position;
+    out vec2 quad_uv;
+    layout(location = 1) in vec2 uv;
+
+    void main()
+    {
+        gl_Position = vec4(position, 0.0, 1.0);
+        quad_uv = uv;
+    }
+
+*/
+vs_ssao_source_glsl300es := u8.[
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+    0x76,0x20,0x3d,0x20,0x75,0x76,0x3b,0x0a,0x7d,0x0a,0x0a,0x00,
+];
+/*
+    #version 300 es
+    precision mediump float;
+    precision highp int;
+
+    vec4 _204;
+
+    uniform highp vec4 ssao_fs_params[68];
+    uniform highp sampler2D g_position_ssao_smp;
+    uniform highp sampler2D g_normal_ssao_smp;
+    uniform highp sampler2D tex_noise_ssao_smp;
+
+    in highp vec2 quad_uv;
+    layout(location = 0) out highp vec4 out_color;
+
+    void main()
+    {
+        highp vec4 _25 = texture(g_position_ssao_smp, quad_uv);
+        highp vec3 _26 = _25.xyz;
+        highp vec3 _35 = normalize(texture(g_normal_ssao_smp, quad_uv).xyz);
+        highp vec3 _51 = normalize(texture(tex_noise_ssao_smp, quad_uv * vec2(320.0, 180.0)).xyz);
+        highp vec3 _60 = normalize(_51 - (_35 * dot(_51, _35)));
+        highp mat3 _85 = mat3(_60, cross(_35, _60), _35);
+        highp float occlusion = 0.0;
+        for (int i = 0; i < 64; i++)
+        {
+            highp vec3 _119 = _26 + (_85 * ssao_fs_params[i * 1 + 4].xyz);
+            highp vec4 _131 = mat4(ssao_fs_params[0], ssao_fs_params[1], ssao_fs_params[2], ssao_fs_params[3]) * vec4(_119, 1.0);
+            highp vec2 _138 = _131.xy / vec2(_131.w);
+            highp vec4 _192;
+            _192.x = _138.x;
+            _192.y = _138.y;
+            highp vec2 _150 = (_192.xy * 0.5) + vec2(0.5);
+            highp vec4 _196;
+            _196.x = _150.x;
+            _196.y = _150.y;
+            highp vec4 _161 = texture(g_position_ssao_smp, _196.xy);
+            highp float _163 = _161.z;
+            occlusion += (float(_163 >= _119.z) * smoothstep(0.0, 1.0, 1.0 - (_25.z - _163)));
+        }
+        highp float _182 = occlusion;
+        highp float _185 = 1.0 - (_182 * 0.015625);
+        occlusion = _185;
+        out_color = vec4(_185, _185, _185, 1.0);
+    }
+
+*/
+fs_ssao_source_glsl300es := u8.[
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+    0x20,0x31,0x2e,0x30,0x29,0x3b,0x0a,0x7d,0x0a,0x0a,0x00,
+];
+/*
+    #include <metal_stdlib>
+    #include <simd/simd.h>
+
+    using namespace metal;
+
+    struct main0_out
+    {
+        float2 quad_uv [[user(locn0)]];
+        float4 gl_Position [[position]];
+    };
+
+    struct main0_in
+    {
+        float2 position [[attribute(0)]];
+        float2 uv [[attribute(1)]];
+    };
+
+    vertex main0_out main0(main0_in in [[stage_in]])
+    {
+        main0_out out = {};
+        out.gl_Position = float4(in.position, 0.0, 1.0);
+        out.quad_uv = in.uv;
+        return out;
+    }
+
+*/
+vs_ssao_source_metal_macos := u8.[
+    0x23,0x69,0x6e,0x63,0x6c,0x75,0x64,0x65,0x20,0x3c,0x6d,0x65,0x74,0x61,0x6c,0x5f,
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+    0x5f,0x75,0x76,0x20,0x3d,0x20,0x69,0x6e,0x2e,0x75,0x76,0x3b,0x0a,0x20,0x20,0x20,
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+    0x00,
+];
+/*
+    #include <metal_stdlib>
+    #include <simd/simd.h>
+
+    using namespace metal;
+
+    struct ssao_fs_params
+    {
+        float4x4 projection;
+        float4 samples[64];
+    };
+
+    constant float4 _204 = {};
+
+    struct main0_out
+    {
+        float4 out_color [[color(0)]];
+    };
+
+    struct main0_in
+    {
+        float2 quad_uv [[user(locn0)]];
+    };
+
+    fragment main0_out main0(main0_in in [[stage_in]], constant ssao_fs_params& _109 [[buffer(0)]], texture2d<float> g_position [[texture(0)]], texture2d<float> g_normal [[texture(1)]], texture2d<float> tex_noise [[texture(2)]], sampler ssao_smp [[sampler(0)]])
+    {
+        main0_out out = {};
+        float4 _25 = g_position.sample(ssao_smp, in.quad_uv);
+        float3 _26 = _25.xyz;
+        float3 _35 = fast::normalize(g_normal.sample(ssao_smp, in.quad_uv).xyz);
+        float3 _51 = fast::normalize(tex_noise.sample(ssao_smp, (in.quad_uv * float2(320.0, 180.0))).xyz);
+        float3 _60 = fast::normalize(_51 - (_35 * dot(_51, _35)));
+        float3x3 _85 = float3x3(_60, cross(_35, _60), _35);
+        float occlusion = 0.0;
+        for (int i = 0; i < 64; i++)
+        {
+            float3 _119 = _26 + (_85 * _109.samples[i].xyz);
+            float4 _131 = _109.projection * float4(_119, 1.0);
+            float2 _138 = _131.xy / float2(_131.w);
+            float4 _192;
+            _192.x = _138.x;
+            _192.y = _138.y;
+            float2 _150 = (_192.xy * 0.5) + float2(0.5);
+            float4 _196;
+            _196.x = _150.x;
+            _196.y = _150.y;
+            float4 _161 = g_position.sample(ssao_smp, _196.xy);
+            float _163 = _161.z;
+            occlusion += (float(_163 >= _119.z) * smoothstep(0.0, 1.0, 1.0 - (_25.z - _163)));
+        }
+        float _182 = occlusion;
+        float _185 = 1.0 - (_182 * 0.015625);
+        occlusion = _185;
+        out.out_color = float4(_185, _185, _185, 1.0);
+        return out;
+    }
+
+*/
+fs_ssao_source_metal_macos := u8.[
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+    0x5f,0x31,0x38,0x35,0x2c,0x20,0x5f,0x31,0x38,0x35,0x2c,0x20,0x31,0x2e,0x30,0x29,
+    0x3b,0x0a,0x20,0x20,0x20,0x20,0x72,0x65,0x74,0x75,0x72,0x6e,0x20,0x6f,0x75,0x74,
+    0x3b,0x0a,0x7d,0x0a,0x0a,0x00,
+];
+ssao_shader_desc :: (backend: sg_backend) -> sg_shader_desc {
+    desc: sg_shader_desc;
+    desc.label = "ssao_shader";
+    if backend == {
+    case .GLCORE;
+        desc.vertex_func.source = xx *vs_ssao_source_glsl430;
+        desc.vertex_func.entry = "main";
+        desc.fragment_func.source = xx *fs_ssao_source_glsl430;
+        desc.fragment_func.entry = "main";
+        desc.attrs[0].base_type = .FLOAT;
+        desc.attrs[0].glsl_name = "position";
+        desc.attrs[1].base_type = .FLOAT;
+        desc.attrs[1].glsl_name = "uv";
+        desc.uniform_blocks[1].stage = .FRAGMENT;
+        desc.uniform_blocks[1].layout = .STD140;
+        desc.uniform_blocks[1].size = 1088;
+        desc.uniform_blocks[1].glsl_uniforms[0].type = .FLOAT4;
+        desc.uniform_blocks[1].glsl_uniforms[0].array_count = 68;
+        desc.uniform_blocks[1].glsl_uniforms[0].glsl_name = "ssao_fs_params";
+        desc.images[0].stage = .FRAGMENT;
+        desc.images[0].multisampled = false;
+        desc.images[0].image_type = ._2D;
+        desc.images[0].sample_type = .FLOAT;
+        desc.images[1].stage = .FRAGMENT;
+        desc.images[1].multisampled = false;
+        desc.images[1].image_type = ._2D;
+        desc.images[1].sample_type = .FLOAT;
+        desc.images[2].stage = .FRAGMENT;
+        desc.images[2].multisampled = false;
+        desc.images[2].image_type = ._2D;
+        desc.images[2].sample_type = .FLOAT;
+        desc.samplers[0].stage = .FRAGMENT;
+        desc.samplers[0].sampler_type = .FILTERING;
+        desc.image_sampler_pairs[0].stage = .FRAGMENT;
+        desc.image_sampler_pairs[0].image_slot = 0;
+        desc.image_sampler_pairs[0].sampler_slot = 0;
+        desc.image_sampler_pairs[0].glsl_name = "g_position_ssao_smp";
+        desc.image_sampler_pairs[1].stage = .FRAGMENT;
+        desc.image_sampler_pairs[1].image_slot = 1;
+        desc.image_sampler_pairs[1].sampler_slot = 0;
+        desc.image_sampler_pairs[1].glsl_name = "g_normal_ssao_smp";
+        desc.image_sampler_pairs[2].stage = .FRAGMENT;
+        desc.image_sampler_pairs[2].image_slot = 2;
+        desc.image_sampler_pairs[2].sampler_slot = 0;
+        desc.image_sampler_pairs[2].glsl_name = "tex_noise_ssao_smp";
+    case .GLES3;
+        desc.vertex_func.source = xx *vs_ssao_source_glsl300es;
+        desc.vertex_func.entry = "main";
+        desc.fragment_func.source = xx *fs_ssao_source_glsl300es;
+        desc.fragment_func.entry = "main";
+        desc.attrs[0].base_type = .FLOAT;
+        desc.attrs[0].glsl_name = "position";
+        desc.attrs[1].base_type = .FLOAT;
+        desc.attrs[1].glsl_name = "uv";
+        desc.uniform_blocks[1].stage = .FRAGMENT;
+        desc.uniform_blocks[1].layout = .STD140;
+        desc.uniform_blocks[1].size = 1088;
+        desc.uniform_blocks[1].glsl_uniforms[0].type = .FLOAT4;
+        desc.uniform_blocks[1].glsl_uniforms[0].array_count = 68;
+        desc.uniform_blocks[1].glsl_uniforms[0].glsl_name = "ssao_fs_params";
+        desc.images[0].stage = .FRAGMENT;
+        desc.images[0].multisampled = false;
+        desc.images[0].image_type = ._2D;
+        desc.images[0].sample_type = .FLOAT;
+        desc.images[1].stage = .FRAGMENT;
+        desc.images[1].multisampled = false;
+        desc.images[1].image_type = ._2D;
+        desc.images[1].sample_type = .FLOAT;
+        desc.images[2].stage = .FRAGMENT;
+        desc.images[2].multisampled = false;
+        desc.images[2].image_type = ._2D;
+        desc.images[2].sample_type = .FLOAT;
+        desc.samplers[0].stage = .FRAGMENT;
+        desc.samplers[0].sampler_type = .FILTERING;
+        desc.image_sampler_pairs[0].stage = .FRAGMENT;
+        desc.image_sampler_pairs[0].image_slot = 0;
+        desc.image_sampler_pairs[0].sampler_slot = 0;
+        desc.image_sampler_pairs[0].glsl_name = "g_position_ssao_smp";
+        desc.image_sampler_pairs[1].stage = .FRAGMENT;
+        desc.image_sampler_pairs[1].image_slot = 1;
+        desc.image_sampler_pairs[1].sampler_slot = 0;
+        desc.image_sampler_pairs[1].glsl_name = "g_normal_ssao_smp";
+        desc.image_sampler_pairs[2].stage = .FRAGMENT;
+        desc.image_sampler_pairs[2].image_slot = 2;
+        desc.image_sampler_pairs[2].sampler_slot = 0;
+        desc.image_sampler_pairs[2].glsl_name = "tex_noise_ssao_smp";
+    case .METAL_MACOS;
+        desc.vertex_func.source = xx *vs_ssao_source_metal_macos;
+        desc.vertex_func.entry = "main0";
+        desc.fragment_func.source = xx *fs_ssao_source_metal_macos;
+        desc.fragment_func.entry = "main0";
+        desc.attrs[0].base_type = .FLOAT;
+        desc.attrs[1].base_type = .FLOAT;
+        desc.uniform_blocks[1].stage = .FRAGMENT;
+        desc.uniform_blocks[1].layout = .STD140;
+        desc.uniform_blocks[1].size = 1088;
+        desc.uniform_blocks[1].msl_buffer_n = 0;
+        desc.images[0].stage = .FRAGMENT;
+        desc.images[0].multisampled = false;
+        desc.images[0].image_type = ._2D;
+        desc.images[0].sample_type = .FLOAT;
+        desc.images[0].msl_texture_n = 0;
+        desc.images[1].stage = .FRAGMENT;
+        desc.images[1].multisampled = false;
+        desc.images[1].image_type = ._2D;
+        desc.images[1].sample_type = .FLOAT;
+        desc.images[1].msl_texture_n = 1;
+        desc.images[2].stage = .FRAGMENT;
+        desc.images[2].multisampled = false;
+        desc.images[2].image_type = ._2D;
+        desc.images[2].sample_type = .FLOAT;
+        desc.images[2].msl_texture_n = 2;
+        desc.samplers[0].stage = .FRAGMENT;
+        desc.samplers[0].sampler_type = .FILTERING;
+        desc.samplers[0].msl_sampler_n = 0;
+        desc.image_sampler_pairs[0].stage = .FRAGMENT;
+        desc.image_sampler_pairs[0].image_slot = 0;
+        desc.image_sampler_pairs[0].sampler_slot = 0;
+        desc.image_sampler_pairs[1].stage = .FRAGMENT;
+        desc.image_sampler_pairs[1].image_slot = 1;
+        desc.image_sampler_pairs[1].sampler_slot = 0;
+        desc.image_sampler_pairs[2].stage = .FRAGMENT;
+        desc.image_sampler_pairs[2].image_slot = 2;
+        desc.image_sampler_pairs[2].sampler_slot = 0;
+    }
+    return desc;
+}

src/shaders/shader_ssao.glsl

@@ -0,0 +1,59 @@
+@vs vs_ssao
+in vec2 position;
+in vec2 uv;
+
+out vec2 quad_uv;
+
+void main() {
+    gl_Position = vec4(position, 0.0, 1.0);
+    quad_uv = uv;
+}
+@end
+
+@fs fs_ssao
+
+layout(binding=0) uniform texture2D g_position;
+layout(binding=1) uniform texture2D g_normal;
+layout(binding=2) uniform texture2D tex_noise;
+
+layout(binding=0) uniform sampler ssao_smp;
+
+layout(binding=1) uniform ssao_fs_params {
+    mat4 projection;
+    vec4 samples[64];
+};
+
+in vec2 quad_uv;
+out vec4 out_color;
+
+void main() {
+    vec3 frag_pos = texture(sampler2D(g_position, ssao_smp), quad_uv).xyz;
+    vec3 normal = normalize(texture(sampler2D(g_normal, ssao_smp), quad_uv).rgb);
+    vec2 noise_scale = vec2(1280.0/4.0, 720.0/4.0); // @Incomplete: get screen size
+    vec3 random_vec = normalize(texture(sampler2D(tex_noise, ssao_smp), quad_uv * noise_scale).xyz);
+
+    vec3 tangent = normalize(random_vec - normal * dot(random_vec, normal));
+    vec3 bitangent = cross(normal, tangent);
+    mat3 tbn = mat3(tangent, bitangent, normal);
+
+    float occlusion = 0.0;
+    for (int i = 0; i < 64; ++i) {
+        vec3 sample_pos = tbn * samples[i].xyz;
+        sample_pos = frag_pos + sample_pos;
+
+        vec4 offset = vec4(sample_pos, 1.0);
+        offset = projection * offset;
+        offset.xy /= offset.w;
+        offset.xy = offset.xy * 0.5 + 0.5;
+
+        float sample_depth = texture(sampler2D(g_position, ssao_smp), offset.xy).z;
+        float range_check = smoothstep(0.0, 1.0, 1.0 - (frag_pos.z - sample_depth));
+        occlusion += (sample_depth >= sample_pos.z ? 1.0 : 0.0) * range_check;
+    }
+
+    occlusion = 1.0 - (occlusion / 64.0);
+    out_color = vec4(occlusion, occlusion, occlusion, 1.0);
+}
+@end
+
+@program ssao vs_ssao fs_ssao