create billboard rendering pipeline

src/main.jai

@@ -11,6 +11,7 @@ MEM_DEBUG :: false;
 #import "Hash";
 #import "Simple_Package_Reader";
 
+String :: #import "String";
 Jaison :: #import "Jaison";
 stbi   :: #import "stb_image";
 

src/rendering/backend.jai

@@ -21,6 +21,7 @@ Render_Command_Type :: enum {
     UPDATE_TRIXELS;
     DRAW_TRIXELS;
     SET_LIGHT;
+    DRAW_BILLBOARD;
 }
 
 Render_Command :: struct {
@@ -60,6 +61,11 @@ Render_Command_Update_Trixels :: struct {
     colMultipliers : *[16][16][16]Vector3;
 }
 
+Render_Command_Draw_Billboard :: struct {
+    #as using c    : Render_Command;
+    c.type         = .DRAW_BILLBOARD;
+}
+
 Render_Command_Draw_Trixels :: struct {
     #as using c : Render_Command;
     c.type      = .DRAW_TRIXELS;

src/rendering/backend_sokol.jai

@@ -40,6 +40,8 @@ backend_handle_command :: (cmd: *Render_Command) {
         case .SET_LIGHT;
             set_light_command := cast(*Render_Command_Set_Light)cmd;
             current_world_config = set_light_command.worldConfig;
+        case .DRAW_BILLBOARD;
+            backend_draw_billboard();
     }
 }
 
@@ -223,6 +225,31 @@ backend_draw_ground :: (wc: *World_Config) {
     sg_draw(0, 6, 2);    
 }
 
+backend_draw_billboard :: () {
+    mvp := create_viewproj(*camera);
+    vs_params : Billboard_Vs_Params;
+    anim := table_find_pointer(*g_animations, "player_idle");
+    if anim {
+        gPipelines.billboard.bind.images[0] = anim.sheet;
+        num := cast(s32)(get_time() / 0.1) % anim.frames.count;
+        frame := anim.frames[num];
+        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;
+        vs_params.size = Vector2.{cast(float)(frame.w / 16), cast(float)(frame.h / 16)}.component;
+        vs_params.cam = camera.position.component;
+    }
+    vs_params.mvp = mvp.floats;
+    vs_params.offset = Vector3.{10, 1, 5.5}.component;
+    sg_apply_pipeline(gPipelines.billboard.pipeline);
+    sg_apply_bindings(*gPipelines.billboard.bind);
+    sg_apply_uniforms(UB_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);

src/rendering/helpers.jai

@@ -15,6 +15,7 @@ fill_uniform_with_engine_data :: (uniform: *$A, enginedata: *$B) {
 create_world_rendering_tasks :: (world: *World) {
     create_sky_rendering_task(*world.conf);
     create_set_light_rendering_task(*world.conf);
+    create_billboard_rendering_task();
     for world.positions {
         if it.positions.count < 1 then continue;
 		triletask := Rendering_Task_Trile.{};
@@ -47,6 +48,11 @@ create_ground_rendering_task :: (world: *World) {
 	add_rendering_task(groundtask);
 }
 
+create_billboard_rendering_task :: () {
+	billboardtask := Rendering_Task_Billboard.{type = .BILLBOARD };
+	add_rendering_task(billboardtask);
+}
+
 create_set_cam_rendering_task :: (cam: Camera, planeHeight: float) {
     camtask := Rendering_Task_Set_Camera.{type = .SET_CAMERA, camera = cam, planeHeight = planeHeight};
     add_rendering_task(camtask);

src/rendering/pipelines.jai

@@ -63,6 +63,8 @@ gPipelines : struct {
     op : Pipeline_Binding;
     
     mix : Pipeline_Binding;
+    
+    billboard : Pipeline_Binding;
 
     // Renders the SSAO texture using things from the gbuffer pass.
     ssao: Pipeline_Binding;
@@ -139,6 +141,7 @@ create_pipelines :: () {
     create_ssao_pipeline();
     create_op_pipeline();
     create_mix_pipeline();
+    create_billboard_pipeline();
     
     create_shadowmap_image();
     create_final_image();
@@ -761,6 +764,61 @@ create_op_pipeline :: () {
 
 }
 
+create_billboard_pipeline :: () {
+    pipeline: sg_pipeline_desc;
+    shader_desc := 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 := sg_color_target_state.{
+        pixel_format = .RGBA32F,
+        blend = .{
+            enabled = true,
+            src_factor_rgb = .SRC_ALPHA,
+            dst_factor_rgb = .ONE_MINUS_SRC_ALPHA
+        }
+    };
+
+    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 = 1;
+    pipeline.colors[0]   = color_state;
+
+    gPipelines.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.billboard.bind.index_buffer      = sg_make_buffer(*ibuffer);
+    gPipelines.billboard.bind.vertex_buffers[0] = sg_make_buffer(*vbuffer);
+
+    gPipelines.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

@@ -8,8 +8,8 @@ Rendering_Task_Type :: enum {
     SET_LIGHT;
     TRILE;     // We need to add an ability to invalidate buffer instead of updating it constantly. Also probably have a buffer for static world triles and one for moving ones.
     TRIXELS;
-    SPRITE;    
+    BILLBOARD; 
-    PARTICLES; 
+    PARTICLES;
 };
 
 Rendering_Task :: struct {
@@ -39,6 +39,11 @@ Rendering_Task_Ground :: struct {
     world : *World;
 }
 
+Rendering_Task_Billboard :: struct {
+    #as using t : Rendering_Task;
+    t.type      = .BILLBOARD;
+}
+
 Rendering_Task_Trile :: struct {
     #as using t : Rendering_Task;
     t.type      = .TRILE;
@@ -115,6 +120,9 @@ tasks_to_commands :: () {
                 commandDrawGround.worldConfig = *(cast(*Rendering_Task_Ground)it).world.conf;
                 array_add(*render_command_buckets.main, commandDrawGround);
                 array_add(*render_command_buckets.gbuffer, commandDrawGround);
+            case .BILLBOARD;
+                commandDrawBillboard := New(Render_Command_Draw_Billboard,, temp);
+                array_add(*render_command_buckets.main, commandDrawBillboard);
             case .SET_CAMERA;
                 task := (cast(*Rendering_Task_Set_Camera)it);
                 command := New(Render_Command_Set_Camera,, temp);

src/shaders/jai/shader_billboard.jai

@@ -0,0 +1,506 @@
+/*
+    #version:1# (machine generated, don't edit!)
+
+    Generated by sokol-shdc (https://github.com/floooh/sokol-tools)
+
+    Cmdline:
+        sokol-shdc -i shader_billboard.glsl -o ./jai/shader_billboard.jai -l glsl430:glsl300es:metal_macos -f sokol_jai
+
+    Overview:
+    =========
+    Shader program: 'billboard':
+        Get shader desc: billboard_shader_desc(sg_query_backend())
+        Vertex Shader: vs_billboard
+        Fragment Shader: fs_billboard
+        Attributes:
+            ATTR_billboard_position => 0
+    Bindings:
+        Uniform block 'billboard_vs_params':
+            Jai struct: Billboard_Vs_Params
+            Bind slot: UB_billboard_vs_params => 0
+        Image 'sprite':
+            Image type: ._2D
+            Sample type: .FLOAT
+            Multisampled: false
+            Bind slot: IMG_sprite => 0
+        Sampler 'spritesmp':
+            Type: .FILTERING
+            Bind slot: SMP_spritesmp => 0
+*/
+ATTR_billboard_position :: 0;
+UB_billboard_vs_params :: 0;
+IMG_sprite :: 0;
+SMP_spritesmp :: 0;
+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;
+};
+/*
+    #version 430
+
+    uniform vec4 billboard_vs_params[8];
+    layout(location = 0) in vec3 position;
+    layout(location = 0) out vec2 uv_in;
+
+    void main()
+    {
+        vec3 _53 = billboard_vs_params[5].xyz - billboard_vs_params[7].xyz;
+        _53.y = 0.0;
+        gl_Position = mat4(billboard_vs_params[0], billboard_vs_params[1], billboard_vs_params[2], billboard_vs_params[3]) * vec4((billboard_vs_params[5].xyz + (normalize(cross(vec3(0.0, 1.0, 0.0), normalize(_53))) * ((position.x - 0.5) * billboard_vs_params[6].x))) + (vec3(0.0, 1.0, 0.0) * (position.y * billboard_vs_params[6].y)), 1.0);
+        uv_in = vec2(billboard_vs_params[4].x + (position.x * billboard_vs_params[4].z), billboard_vs_params[4].y + (position.y * billboard_vs_params[4].w));
+    }
+
+*/
+vs_billboard_source_glsl430 := u8.[
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+    0x0a,0x7d,0x0a,0x0a,0x00,
+];
+/*
+    #version 430
+
+    layout(binding = 16) uniform sampler2D sprite_spritesmp;
+
+    layout(location = 0) in vec2 uv_in;
+    layout(location = 0) out vec4 color;
+
+    void main()
+    {
+        vec2 _12 = uv_in;
+        _12.y = 1.0 - _12.y;
+        vec4 _35 = texture(sprite_spritesmp, _12);
+        if (_35.w < 0.00999999977648258209228515625)
+        {
+            discard;
+        }
+        color = vec4(_35.xyz * 0.300000011920928955078125, 1.0);
+    }
+
+*/
+fs_billboard_source_glsl430 := u8.[
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+    0x2e,0x78,0x79,0x7a,0x20,0x2a,0x20,0x30,0x2e,0x33,0x30,0x30,0x30,0x30,0x30,0x30,
+    0x31,0x31,0x39,0x32,0x30,0x39,0x32,0x38,0x39,0x35,0x35,0x30,0x37,0x38,0x31,0x32,
+    0x35,0x2c,0x20,0x31,0x2e,0x30,0x29,0x3b,0x0a,0x7d,0x0a,0x0a,0x00,
+];
+/*
+    #version 300 es
+
+    uniform vec4 billboard_vs_params[8];
+    layout(location = 0) in vec3 position;
+    out vec2 uv_in;
+
+    void main()
+    {
+        vec3 _53 = billboard_vs_params[5].xyz - billboard_vs_params[7].xyz;
+        _53.y = 0.0;
+        gl_Position = mat4(billboard_vs_params[0], billboard_vs_params[1], billboard_vs_params[2], billboard_vs_params[3]) * vec4((billboard_vs_params[5].xyz + (normalize(cross(vec3(0.0, 1.0, 0.0), normalize(_53))) * ((position.x - 0.5) * billboard_vs_params[6].x))) + (vec3(0.0, 1.0, 0.0) * (position.y * billboard_vs_params[6].y)), 1.0);
+        uv_in = vec2(billboard_vs_params[4].x + (position.x * billboard_vs_params[4].z), billboard_vs_params[4].y + (position.y * billboard_vs_params[4].w));
+    }
+
+*/
+vs_billboard_source_glsl300es := u8.[
+    0x23,0x76,0x65,0x72,0x73,0x69,0x6f,0x6e,0x20,0x33,0x30,0x30,0x20,0x65,0x73,0x0a,
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+    0x0a,0x0a,0x00,
+];
+/*
+    #version 300 es
+    precision mediump float;
+    precision highp int;
+
+    uniform highp sampler2D sprite_spritesmp;
+
+    in highp vec2 uv_in;
+    layout(location = 0) out highp vec4 color;
+
+    void main()
+    {
+        highp vec2 _12 = uv_in;
+        _12.y = 1.0 - _12.y;
+        highp vec4 _35 = texture(sprite_spritesmp, _12);
+        if (_35.w < 0.00999999977648258209228515625)
+        {
+            discard;
+        }
+        color = vec4(_35.xyz * 0.300000011920928955078125, 1.0);
+    }
+
+*/
+fs_billboard_source_glsl300es := u8.[
+    0x23,0x76,0x65,0x72,0x73,0x69,0x6f,0x6e,0x20,0x33,0x30,0x30,0x20,0x65,0x73,0x0a,
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+    0x30,0x30,0x30,0x30,0x30,0x31,0x31,0x39,0x32,0x30,0x39,0x32,0x38,0x39,0x35,0x35,
+    0x30,0x37,0x38,0x31,0x32,0x35,0x2c,0x20,0x31,0x2e,0x30,0x29,0x3b,0x0a,0x7d,0x0a,
+    0x0a,0x00,
+];
+/*
+    #include <metal_stdlib>
+    #include <simd/simd.h>
+
+    using namespace metal;
+
+    struct billboard_vs_params
+    {
+        float4x4 mvp;
+        float4 uvs;
+        float3 offset;
+        float2 size;
+        float3 cam;
+    };
+
+    struct main0_out
+    {
+        float2 uv_in [[user(locn0)]];
+        float4 gl_Position [[position]];
+    };
+
+    struct main0_in
+    {
+        float3 position [[attribute(0)]];
+    };
+
+    vertex main0_out main0(main0_in in [[stage_in]], constant billboard_vs_params& _24 [[buffer(0)]])
+    {
+        main0_out out = {};
+        float3 _53 = _24.offset - _24.cam;
+        _53.y = 0.0;
+        out.gl_Position = _24.mvp * 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.uv_in = float2(_24.uvs.x + (in.position.x * _24.uvs.z), _24.uvs.y + (in.position.y * _24.uvs.w));
+        return out;
+    }
+
+*/
+vs_billboard_source_metal_macos := u8.[
+    0x23,0x69,0x6e,0x63,0x6c,0x75,0x64,0x65,0x20,0x3c,0x6d,0x65,0x74,0x61,0x6c,0x5f,
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+];
+/*
+    #include <metal_stdlib>
+    #include <simd/simd.h>
+
+    using namespace metal;
+
+    struct main0_out
+    {
+        float4 color [[color(0)]];
+    };
+
+    struct main0_in
+    {
+        float2 uv_in [[user(locn0)]];
+    };
+
+    fragment main0_out main0(main0_in in [[stage_in]], texture2d<float> sprite [[texture(0)]], sampler spritesmp [[sampler(0)]])
+    {
+        main0_out out = {};
+        float4 _27 = sprite.sample(spritesmp, in.uv_in);
+        if (_27.w < 0.00999999977648258209228515625)
+        {
+            discard_fragment();
+        }
+        out.color = float4(_27.xyz * 0.300000011920928955078125, 1.0);
+        return out;
+    }
+
+*/
+fs_billboard_source_metal_macos := u8.[
+    0x23,0x69,0x6e,0x63,0x6c,0x75,0x64,0x65,0x20,0x3c,0x6d,0x65,0x74,0x61,0x6c,0x5f,
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+    0x0a,0x00,
+];
+billboard_shader_desc :: (backend: sg_backend) -> sg_shader_desc {
+    desc: sg_shader_desc;
+    desc.label = "billboard_shader";
+    if backend == {
+    case .GLCORE;
+        desc.vertex_func.source = xx *vs_billboard_source_glsl430;
+        desc.vertex_func.entry = "main";
+        desc.fragment_func.source = xx *fs_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 = 128;
+        desc.uniform_blocks[0].glsl_uniforms[0].type = .FLOAT4;
+        desc.uniform_blocks[0].glsl_uniforms[0].array_count = 8;
+        desc.uniform_blocks[0].glsl_uniforms[0].glsl_name = "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 = "sprite_spritesmp";
+    case .GLES3;
+        desc.vertex_func.source = xx *vs_billboard_source_glsl300es;
+        desc.vertex_func.entry = "main";
+        desc.fragment_func.source = xx *fs_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 = 128;
+        desc.uniform_blocks[0].glsl_uniforms[0].type = .FLOAT4;
+        desc.uniform_blocks[0].glsl_uniforms[0].array_count = 8;
+        desc.uniform_blocks[0].glsl_uniforms[0].glsl_name = "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 = "sprite_spritesmp";
+    case .METAL_MACOS;
+        desc.vertex_func.source = xx *vs_billboard_source_metal_macos;
+        desc.vertex_func.entry = "main0";
+        desc.fragment_func.source = xx *fs_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 = 128;
+        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_billboard.glsl

@@ -0,0 +1,48 @@
+@vs vs_billboard
+
+in vec3 position;
+
+layout(binding=0) uniform billboard_vs_params {
+    mat4 mvp;
+    vec4 uvs;
+    vec3 offset;
+    vec2 size;
+    vec3 cam;
+};
+
+out vec2 uv_in;
+
+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);
+    uv_in = vec2(uvs.x + position.x * uvs.z, uvs.y + position.y * uvs.w);
+}
+@end
+
+@fs fs_billboard
+
+in vec2 uv_in;
+out vec4 color;
+
+layout(binding = 0) uniform texture2D sprite;
+layout(binding = 0) uniform sampler spritesmp;
+
+void main() {
+    vec2 uv = uv_in;
+    #if SOKOL_GLSL
+        uv.y = 1.0 - uv.y;
+    #endif
+    vec4 sampled = texture(sampler2D(sprite, spritesmp), uv);
+    if(sampled.a < 0.01) discard;
+    color = vec4(sampled.rgb * 0.3, 1.0);
+}
+
+@end
+
+@program billboard vs_billboard fs_billboard