add billboard rendering to gbuffer pass

src/main.jai

@@ -133,7 +133,7 @@ init_after_asset_pack :: () {
     // We want to do this last.
     game_init();
 
-    #if UNCAPPED_FRAMES then sapp_glx_swapinterval(0);
+    // #if UNCAPPED_FRAMES then sapp_glx_swapinterval(0);
 }
 
 is_in_reflection_pass : bool = false;
@@ -168,7 +168,6 @@ frame :: () {
         while delta_time_accumulator > (1.0/60.0) {
             game_tick(1.0/60.0);
             delta_time_accumulator -= (1.0/60.0);
-            input_per_frame_event_and_flag_update();
         }
     }
     fonsClearState(state.fons);
@@ -196,6 +195,7 @@ frame :: () {
     reset_temporary_storage();
     frame_end_time := get_time();
     latest_frametime = frame_end_time - frame_start_time;
+    input_per_frame_event_and_flag_update();
 }
 
 cleanup :: () {

src/platform_specific/common.jai

@@ -38,7 +38,6 @@ sapp_init :: () {
         window_title = wi.title,
         // icon = .{ sokol_default = true },
         logger = .{ func = slog_func },
-        swap_interval = 0,
         sample_count = 1, // I think I'll end up pixelifying the whole thing, so I don't think we need MSAA.
     }));
     }

src/rendering/backend_sokol.jai

@@ -42,7 +42,11 @@ backend_handle_command :: (cmd: *Render_Command) {
             current_world_config = set_light_command.worldConfig;
         case .DRAW_BILLBOARD;
             command := cast(*Render_Command_Draw_Billboard)cmd;
+            if !in_gbuffer_pass {
                 backend_draw_billboard(command.position, command.animation, command.frame, command.flipX);
+            } else {
+                backend_gbuffer_draw_billboard(command.position, command.animation, command.frame, command.flipX);
+            }
     }
 }
 
@@ -265,6 +269,38 @@ backend_draw_billboard :: (position: Vector3, anim: *Animation, frame_idx: s32,
     sg_draw(0, 6, 1);    
 }
 
+backend_gbuffer_draw_billboard :: (position: Vector3, anim: *Animation, frame_idx: s32, flipX: bool) {
+    if !anim then return;
+    mvp := create_viewproj(*camera);
+    view := create_lookat(*camera);
+    vs_params : Gbuffer_Billboard_Vs_Params;
+    vs_params.view_matrix = view.floats;
+    gPipelines.gbuffer_billboard.bind.images[0] = anim.sheet;
+    frame := anim.frames[frame_idx];
+    vs_params.uvs = Vector4.{
+        cast(float) frame.x / cast(float)anim.sheet_w,
+        cast(float) frame.y / cast(float)anim.sheet_h,
+        cast(float) frame.w / cast(float)anim.sheet_w,
+        cast(float) frame.h / cast(float)anim.sheet_h,
+    }.component;
+    if flipX {
+        vs_params.uvs[0] += vs_params.uvs[2];
+        vs_params.uvs[2] *= -1.0;
+    }
+    vs_params.size = Vector2.{cast(float)(frame.w / 16), cast(float)(frame.h / 16)}.component;
+    vs_params.cam = camera.position.component;
+    if !in_shadowmap_pass {
+        vs_params.mvp = mvp.floats;
+    } else {
+        vs_params.mvp = shadow_mvp.floats;
+    }
+    vs_params.offset = position.component;
+    sg_apply_pipeline(gPipelines.gbuffer_billboard.pipeline);
+    sg_apply_bindings(*gPipelines.gbuffer_billboard.bind);
+    sg_apply_uniforms(UB_gbuffer_billboard_vs_params, *(sg_range.{ ptr = *vs_params, size = size_of(type_of(vs_params)) }));
+    sg_draw(0, 6, 1);    
+}
+
 backend_draw_ground_gbuf :: (wc: *World_Config) {
     mvp := create_viewproj(*camera);
     view := create_lookat(*camera);
@@ -316,14 +352,14 @@ backend_process_command_buckets :: () {
     current_trile_offset_index = 0; // This is not optimal, but it is nice and simple.
     
     // 4. G-Buffer pass
-    // in_gbuffer_pass = true;
+    in_gbuffer_pass = true;
-    // sg_begin_pass(*(sg_pass.{ action = state.pass_action_clear_gbuf, attachments = g_gbuf_attachments}));
+    sg_begin_pass(*(sg_pass.{ action = state.pass_action_clear_gbuf, attachments = g_gbuf_attachments}));
-    // for render_command_buckets.gbuffer {
+    for render_command_buckets.gbuffer {
-    //     backend_handle_command(it);
+        backend_handle_command(it);
-    // }
+    }
-    // sg_end_pass();
+    sg_end_pass();
-    // in_gbuffer_pass = false;
+    in_gbuffer_pass = false;
-    // current_trile_offset_index = 0; // This is not optimal, but it is nice and simple.
+    current_trile_offset_index = 0; // This is not optimal, but it is nice and simple.
  
     sg_begin_pass(*(sg_pass.{ action = state.pass_action_clear, attachments = g_postprocess_attach_a }));
     sg_apply_pipeline(gPipelines.ssao.pipeline);

src/rendering/helpers.jai

@@ -77,8 +77,8 @@ get_low_res :: (width: s32, height: s32, max_dimension: s32 = 720) -> (s32, s32)
 
 get_render_size :: () -> (s32, s32) {
 	w,h := get_window_size();
-	// wl, hl := get_low_res(w,h, 360);
+	wl, hl := get_low_res(w,h, 800);
-	return w, h;
+	return wl, hl;
 }
 
 flip_y_if_plat :: inline (v: Vector2) -> Vector2 {

src/rendering/pipelines.jai

@@ -66,6 +66,8 @@ gPipelines : struct {
     
     billboard : Pipeline_Binding;
     
+    gbuffer_billboard : Pipeline_Binding;
+
     // Renders the SSAO texture using things from the gbuffer pass.
     ssao: Pipeline_Binding;
 }
@@ -74,6 +76,7 @@ create_final_image :: () {
     // @ToDo: Some smarter logic for this.
     w,h := get_render_size();
 
+
     if g_rendertex.id != INVALID_ID then sg_destroy_image(g_rendertex);
     if g_rendertex_depth.id != INVALID_ID then sg_destroy_image(g_rendertex);
 
@@ -142,6 +145,7 @@ create_pipelines :: () {
     create_op_pipeline();
     create_mix_pipeline();
     create_billboard_pipeline();
+    create_gbuffer_billboard_pipeline();
     
     create_shadowmap_image();
     create_final_image();
@@ -812,6 +816,64 @@ create_billboard_pipeline :: () {
     }));
 }
 
+create_gbuffer_billboard_pipeline :: () {
+    pipeline: sg_pipeline_desc;
+    shader_desc := gbuffer_billboard_shader_desc(sg_query_backend());
+    pipeline.shader = sg_make_shader(*shader_desc);
+    pipeline.layout.buffers[0].stride = 4*3;
+
+    pipeline.layout.attrs[ATTR_billboard_position] = .{ format = .FLOAT3, buffer_index = 0 };
+    pipeline.index_type = .UINT16;
+    pipeline.depth = .{
+        write_enabled = true,
+        compare = .LESS_EQUAL,
+        pixel_format = .DEPTH
+    };
+
+    color_state_pos := sg_color_target_state.{
+        pixel_format = .RGBA16F,
+    };
+    color_state_normal := sg_color_target_state.{
+        pixel_format = .RGBA16F,
+    };
+
+
+    pipeline.color_count = 2;
+    pipeline.colors[0]   = color_state_pos;
+    pipeline.colors[1]   = color_state_normal;
+
+    vertices: [4]Vector3 = .[
+        .{ 0.0,  0.0, 0.0},
+        .{ 1.0,  0.0, 0.0},
+        .{ 1.0,  1.0, 0.0},
+        .{ 0.0,  1.0, 0.0},
+    ];
+
+    indices: [6]u16 = .[
+        0, 1, 2,
+        0, 2, 3,
+    ];
+
+    pipeline.color_count = 2;
+    pipeline.colors[0]   = color_state_pos;
+    pipeline.colors[1]   = color_state_normal;
+
+    gPipelines.gbuffer_billboard.pipeline = sg_make_pipeline(*pipeline);
+
+    ibuffer         := sg_buffer_desc.{ type = .INDEXBUFFER, data = .{ ptr = indices.data, size = 6 * 2 } };
+    vbuffer         := sg_buffer_desc.{ data = .{ ptr = vertices.data, size = 4 * 3 * 4 } };
+
+    gPipelines.gbuffer_billboard.bind.index_buffer      = sg_make_buffer(*ibuffer);
+    gPipelines.gbuffer_billboard.bind.vertex_buffers[0] = sg_make_buffer(*vbuffer);
+
+    gPipelines.gbuffer_billboard.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,
+    }));
+}
+
 // Takes in 2-3 textures, and mixes them.
 create_mix_pipeline :: () {
     platconf := get_plat_conf();

src/rendering/tasks.jai

@@ -133,6 +133,7 @@ tasks_to_commands :: () {
                 commandDrawBillboard.flipX = billboardTask.flipX;
                 commandDrawBillboard.flipY = billboardTask.flipY;
                 commandDrawBillboard.animation = billboardTask.animation;
+                array_add(*render_command_buckets.gbuffer, commandDrawBillboard);
                 array_add(*render_command_buckets.main, commandDrawBillboard);
                 array_add(*render_command_buckets.shadow, commandDrawBillboard);
                 array_add(*render_command_buckets.reflection, commandDrawBillboard);

src/shaders/jai/shader_gbuffer_billboard.jai

@@ -0,0 +1,646 @@
+/*
+    #version:1# (machine generated, don't edit!)
+
+    Generated by sokol-shdc (https://github.com/floooh/sokol-tools)
+
+    Cmdline:
+        sokol-shdc -i shader_gbuffer_billboard.glsl -o ./jai/shader_gbuffer_billboard.jai -l glsl430:glsl300es:metal_macos -f sokol_jai
+
+    Overview:
+    =========
+    Shader program: 'gbuffer_billboard':
+        Get shader desc: gbuffer_billboard_shader_desc(sg_query_backend())
+        Vertex Shader: vs_gbuffer_billboard
+        Fragment Shader: fs_gbuffer_billboard
+        Attributes:
+            ATTR_gbuffer_billboard_position => 0
+    Bindings:
+        Uniform block 'gbuffer_billboard_vs_params':
+            Jai struct: Gbuffer_Billboard_Vs_Params
+            Bind slot: UB_gbuffer_billboard_vs_params => 0
+        Image 'gsprite':
+            Image type: ._2D
+            Sample type: .FLOAT
+            Multisampled: false
+            Bind slot: IMG_gsprite => 0
+        Sampler 'gspritesmp':
+            Type: .FILTERING
+            Bind slot: SMP_gspritesmp => 0
+*/
+ATTR_gbuffer_billboard_position :: 0;
+UB_gbuffer_billboard_vs_params :: 0;
+IMG_gsprite :: 0;
+SMP_gspritesmp :: 0;
+Gbuffer_Billboard_Vs_Params :: struct {
+    mvp: [16]float;
+    uvs: [4]float;
+    offset: [3]float;
+    _: [4]u8;
+    size: [2]float;
+    _: [8]u8;
+    cam: [3]float;
+    _: [4]u8;
+    view_matrix: [16]float;
+};
+/*
+    #version 430
+
+    uniform vec4 gbuffer_billboard_vs_params[12];
+    layout(location = 0) in vec3 position;
+    layout(location = 1) out vec3 view_space_pos;
+    layout(location = 2) out vec3 view_space_normal;
+    layout(location = 0) out vec2 uv_in;
+
+    void main()
+    {
+        vec3 _53 = gbuffer_billboard_vs_params[5].xyz - gbuffer_billboard_vs_params[7].xyz;
+        _53.y = 0.0;
+        vec4 _88 = vec4((gbuffer_billboard_vs_params[5].xyz + (normalize(cross(vec3(0.0, 1.0, 0.0), normalize(_53))) * ((position.x - 0.5) * gbuffer_billboard_vs_params[6].x))) + (vec3(0.0, 1.0, 0.0) * (position.y * gbuffer_billboard_vs_params[6].y)), 1.0);
+        gl_Position = mat4(gbuffer_billboard_vs_params[0], gbuffer_billboard_vs_params[1], gbuffer_billboard_vs_params[2], gbuffer_billboard_vs_params[3]) * _88;
+        mat4 _96 = mat4(gbuffer_billboard_vs_params[8], gbuffer_billboard_vs_params[9], gbuffer_billboard_vs_params[10], gbuffer_billboard_vs_params[11]);
+        view_space_pos = (_96 * _88).xyz;
+        view_space_normal = mat3(_96[0].xyz, _96[1].xyz, _96[2].xyz) * vec3(0.0, 1.0, 0.0);
+        uv_in = vec2(gbuffer_billboard_vs_params[4].x + (position.x * gbuffer_billboard_vs_params[4].z), gbuffer_billboard_vs_params[4].y + (position.y * gbuffer_billboard_vs_params[4].w));
+    }
+
+*/
+vs_gbuffer_billboard_source_glsl430 := u8.[
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+];
+/*
+    #version 430
+
+    layout(binding = 16) uniform sampler2D gsprite_gspritesmp;
+
+    layout(location = 0) in vec2 uv_in;
+    layout(location = 0) out vec4 out_position;
+    layout(location = 1) in vec3 view_space_pos;
+    layout(location = 1) out vec4 out_normal;
+    layout(location = 2) in vec3 view_space_normal;
+
+    void main()
+    {
+        vec2 _12 = uv_in;
+        _12.y = 1.0 - _12.y;
+        if (texture(gsprite_gspritesmp, _12).w < 0.00999999977648258209228515625)
+        {
+            discard;
+        }
+        out_position = vec4(view_space_pos, 1.0);
+        out_normal = vec4(normalize(view_space_normal), 1.0);
+    }
+
+*/
+fs_gbuffer_billboard_source_glsl430 := u8.[
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+    0x3b,0x0a,0x7d,0x0a,0x0a,0x00,
+];
+/*
+    #version 300 es
+
+    uniform vec4 gbuffer_billboard_vs_params[12];
+    layout(location = 0) in vec3 position;
+    out vec3 view_space_pos;
+    out vec3 view_space_normal;
+    out vec2 uv_in;
+
+    void main()
+    {
+        vec3 _53 = gbuffer_billboard_vs_params[5].xyz - gbuffer_billboard_vs_params[7].xyz;
+        _53.y = 0.0;
+        vec4 _88 = vec4((gbuffer_billboard_vs_params[5].xyz + (normalize(cross(vec3(0.0, 1.0, 0.0), normalize(_53))) * ((position.x - 0.5) * gbuffer_billboard_vs_params[6].x))) + (vec3(0.0, 1.0, 0.0) * (position.y * gbuffer_billboard_vs_params[6].y)), 1.0);
+        gl_Position = mat4(gbuffer_billboard_vs_params[0], gbuffer_billboard_vs_params[1], gbuffer_billboard_vs_params[2], gbuffer_billboard_vs_params[3]) * _88;
+        mat4 _96 = mat4(gbuffer_billboard_vs_params[8], gbuffer_billboard_vs_params[9], gbuffer_billboard_vs_params[10], gbuffer_billboard_vs_params[11]);
+        view_space_pos = (_96 * _88).xyz;
+        view_space_normal = mat3(_96[0].xyz, _96[1].xyz, _96[2].xyz) * vec3(0.0, 1.0, 0.0);
+        uv_in = vec2(gbuffer_billboard_vs_params[4].x + (position.x * gbuffer_billboard_vs_params[4].z), gbuffer_billboard_vs_params[4].y + (position.y * gbuffer_billboard_vs_params[4].w));
+    }
+
+*/
+vs_gbuffer_billboard_source_glsl300es := u8.[
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+    0x0a,0x00,
+];
+/*
+    #version 300 es
+    precision mediump float;
+    precision highp int;
+
+    uniform highp sampler2D gsprite_gspritesmp;
+
+    in highp vec2 uv_in;
+    layout(location = 0) out highp vec4 out_position;
+    in highp vec3 view_space_pos;
+    layout(location = 1) out highp vec4 out_normal;
+    in highp vec3 view_space_normal;
+
+    void main()
+    {
+        highp vec2 _12 = uv_in;
+        _12.y = 1.0 - _12.y;
+        if (texture(gsprite_gspritesmp, _12).w < 0.00999999977648258209228515625)
+        {
+            discard;
+        }
+        out_position = vec4(view_space_pos, 1.0);
+        out_normal = vec4(normalize(view_space_normal), 1.0);
+    }
+
+*/
+fs_gbuffer_billboard_source_glsl300es := u8.[
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+];
+/*
+    #include <metal_stdlib>
+    #include <simd/simd.h>
+
+    using namespace metal;
+
+    struct gbuffer_billboard_vs_params
+    {
+        float4x4 mvp;
+        float4 uvs;
+        float3 offset;
+        float2 size;
+        float3 cam;
+        float4x4 view_matrix;
+    };
+
+    struct main0_out
+    {
+        float2 uv_in [[user(locn0)]];
+        float3 view_space_pos [[user(locn1)]];
+        float3 view_space_normal [[user(locn2)]];
+        float4 gl_Position [[position]];
+    };
+
+    struct main0_in
+    {
+        float3 position [[attribute(0)]];
+    };
+
+    vertex main0_out main0(main0_in in [[stage_in]], constant gbuffer_billboard_vs_params& _24 [[buffer(0)]])
+    {
+        main0_out out = {};
+        float3 _53 = _24.offset - _24.cam;
+        _53.y = 0.0;
+        float4 _88 = float4((_24.offset + (fast::normalize(cross(float3(0.0, 1.0, 0.0), fast::normalize(_53))) * ((in.position.x - 0.5) * _24.size.x))) + (float3(0.0, 1.0, 0.0) * (in.position.y * _24.size.y)), 1.0);
+        out.gl_Position = _24.mvp * _88;
+        out.view_space_pos = (_24.view_matrix * _88).xyz;
+        out.view_space_normal = float3x3(_24.view_matrix[0].xyz, _24.view_matrix[1].xyz, _24.view_matrix[2].xyz) * float3(0.0, 1.0, 0.0);
+        out.uv_in = float2(_24.uvs.x + (in.position.x * _24.uvs.z), _24.uvs.y + (in.position.y * _24.uvs.w));
+        return out;
+    }
+
+*/
+vs_gbuffer_billboard_source_metal_macos := u8.[
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+    0x0a,0x0a,0x00,
+];
+/*
+    #include <metal_stdlib>
+    #include <simd/simd.h>
+
+    using namespace metal;
+
+    struct main0_out
+    {
+        float4 out_position [[color(0)]];
+        float4 out_normal [[color(1)]];
+    };
+
+    struct main0_in
+    {
+        float2 uv_in [[user(locn0)]];
+        float3 view_space_pos [[user(locn1)]];
+        float3 view_space_normal [[user(locn2)]];
+    };
+
+    fragment main0_out main0(main0_in in [[stage_in]], texture2d<float> gsprite [[texture(0)]], sampler gspritesmp [[sampler(0)]])
+    {
+        main0_out out = {};
+        if (gsprite.sample(gspritesmp, in.uv_in).w < 0.00999999977648258209228515625)
+        {
+            discard_fragment();
+        }
+        out.out_position = float4(in.view_space_pos, 1.0);
+        out.out_normal = float4(fast::normalize(in.view_space_normal), 1.0);
+        return out;
+    }
+
+*/
+fs_gbuffer_billboard_source_metal_macos := u8.[
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+    0x00,
+];
+gbuffer_billboard_shader_desc :: (backend: sg_backend) -> sg_shader_desc {
+    desc: sg_shader_desc;
+    desc.label = "gbuffer_billboard_shader";
+    if backend == {
+    case .GLCORE;
+        desc.vertex_func.source = xx *vs_gbuffer_billboard_source_glsl430;
+        desc.vertex_func.entry = "main";
+        desc.fragment_func.source = xx *fs_gbuffer_billboard_source_glsl430;
+        desc.fragment_func.entry = "main";
+        desc.attrs[0].base_type = .FLOAT;
+        desc.attrs[0].glsl_name = "position";
+        desc.uniform_blocks[0].stage = .VERTEX;
+        desc.uniform_blocks[0].layout = .STD140;
+        desc.uniform_blocks[0].size = 192;
+        desc.uniform_blocks[0].glsl_uniforms[0].type = .FLOAT4;
+        desc.uniform_blocks[0].glsl_uniforms[0].array_count = 12;
+        desc.uniform_blocks[0].glsl_uniforms[0].glsl_name = "gbuffer_billboard_vs_params";
+        desc.images[0].stage = .FRAGMENT;
+        desc.images[0].multisampled = false;
+        desc.images[0].image_type = ._2D;
+        desc.images[0].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 = "gsprite_gspritesmp";
+    case .GLES3;
+        desc.vertex_func.source = xx *vs_gbuffer_billboard_source_glsl300es;
+        desc.vertex_func.entry = "main";
+        desc.fragment_func.source = xx *fs_gbuffer_billboard_source_glsl300es;
+        desc.fragment_func.entry = "main";
+        desc.attrs[0].base_type = .FLOAT;
+        desc.attrs[0].glsl_name = "position";
+        desc.uniform_blocks[0].stage = .VERTEX;
+        desc.uniform_blocks[0].layout = .STD140;
+        desc.uniform_blocks[0].size = 192;
+        desc.uniform_blocks[0].glsl_uniforms[0].type = .FLOAT4;
+        desc.uniform_blocks[0].glsl_uniforms[0].array_count = 12;
+        desc.uniform_blocks[0].glsl_uniforms[0].glsl_name = "gbuffer_billboard_vs_params";
+        desc.images[0].stage = .FRAGMENT;
+        desc.images[0].multisampled = false;
+        desc.images[0].image_type = ._2D;
+        desc.images[0].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 = "gsprite_gspritesmp";
+    case .METAL_MACOS;
+        desc.vertex_func.source = xx *vs_gbuffer_billboard_source_metal_macos;
+        desc.vertex_func.entry = "main0";
+        desc.fragment_func.source = xx *fs_gbuffer_billboard_source_metal_macos;
+        desc.fragment_func.entry = "main0";
+        desc.attrs[0].base_type = .FLOAT;
+        desc.uniform_blocks[0].stage = .VERTEX;
+        desc.uniform_blocks[0].layout = .STD140;
+        desc.uniform_blocks[0].size = 192;
+        desc.uniform_blocks[0].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.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;
+    }
+    return desc;
+}

src/shaders/shader_gbuffer_billboard.glsl

@@ -0,0 +1,59 @@
+@vs vs_gbuffer_billboard
+
+in vec3 position;
+
+layout(binding=0) uniform gbuffer_billboard_vs_params {
+    mat4 mvp;
+    vec4 uvs;
+    vec3 offset;
+    vec2 size;
+    vec3 cam;
+    mat4 view_matrix;
+};
+
+out vec2 uv_in;
+out vec3 view_space_pos;
+out vec3 view_space_normal;
+
+void main() {
+    vec3 local_pos = vec3((position.x - 0.5) * size.x, (position.y) * size.y, position.z);
+    vec3 world_up = vec3(0.0, 1.0, 0.0);
+    vec3 look_dir = offset - cam;
+    look_dir.y = 0.0;
+    look_dir = normalize(look_dir);
+    vec3 world_right = normalize(cross(world_up, look_dir));
+    vec3 world_pos = offset + (world_right * local_pos.x) + (world_up * local_pos.y);
+    gl_Position = mvp * vec4(world_pos, 1.0);
+    vec4 view_pos_4 = view_matrix * vec4(world_pos, 1.0);
+    view_space_pos = view_pos_4.xyz;
+    view_space_normal = mat3(view_matrix) * vec3(0,1,0);
+    uv_in = vec2(uvs.x + position.x * uvs.z, uvs.y + position.y * uvs.w);
+}
+@end
+
+@fs fs_gbuffer_billboard
+
+in vec2 uv_in;
+in vec3 view_space_pos;
+in vec3 view_space_normal;
+
+layout(binding = 0) uniform texture2D gsprite;
+layout(binding = 0) uniform sampler gspritesmp;
+
+layout(location=0) out vec4 out_position;
+layout(location=1) out vec4 out_normal;
+
+void main() {
+    vec2 uv = uv_in;
+    #if SOKOL_GLSL
+        uv.y = 1.0 - uv.y;
+    #endif
+    vec4 sampled = texture(sampler2D(gsprite, gspritesmp), uv);
+    if(sampled.a < 0.01) discard;
+    out_position = vec4(view_space_pos, 1.0);
+    out_normal = vec4(normalize(view_space_normal), 1.0);
+}
+
+@end
+
+@program gbuffer_billboard vs_gbuffer_billboard fs_gbuffer_billboard