Work on passes/pipeline, render targets

camera.odin

@@ -6,27 +6,95 @@ import "core:math/linalg"
 Camera :: struct {
     position: [3]f32,
     forward, up, right: [3]f32,
-
-    fov_degrees: f32,
     near, far: f32,
+    yaw, pitch, roll: f32,
+
+    type: Camera_Type,
 }
 
-create_camera :: proc(renderer: ^Renderer, position: [3]f32, forward, up: [3]f32, fov_degrees, near, far: f32) -> Camera {
+Camera_Type :: union {
+    Camera_Perspective,
+    Camera_Orthographic,
+}
+
+Camera_Perspective :: struct {
+    fov_degrees: f32,
+}
+
+Camera_Orthographic :: struct {
+    height: f32,
+}
+
+@(private) create_camera_base :: proc(
+    renderer: ^Renderer,
+    position: [3]f32,
+    forward, up: [3]f32,
+    near, far: f32,
+    type: Camera_Type,
+    yaw: f32 = 0, pitch: f32 = 0, roll: f32 = 0
+) -> Camera
+{
     c: Camera
     c.position = position
     c.forward = forward
     c.up = up
-    c.fov_degrees = fov_degrees
     c.near = near
     c.far = far
+    c.type = type
+    c.yaw = yaw
+    c.pitch = pitch
+    c.roll = roll
 
     assert(c.forward != {})
     assert(c.up != {})
+    assert(c.near > 0)
+    assert(c.far > 0)
+
+    return c
+}
+
+create_camera_perspective :: proc(
+    renderer: ^Renderer,
+    position: [3]f32,
+    forward, up: [3]f32,
+    near, far: f32,
+    fov_degrees: f32,
+    yaw: f32 = 0, pitch: f32 = 0, roll: f32 = 0
+) -> Camera
+{
     assert(fov_degrees > 0)
     assert(near > 0)
     assert(far > 0)
 
-    return c
+    return create_camera_base(
+        renderer, position, forward, up,
+        near, far,
+        Camera_Perspective {
+            fov_degrees = fov_degrees,
+        },
+        yaw, pitch, roll
+    )
+}
+
+create_camera_orthographic :: proc(
+    renderer: ^Renderer,
+    position: [3]f32,
+    forward, up: [3]f32,
+    near, far: f32,
+    height: f32,
+    yaw: f32 = 0, pitch: f32 = 0, roll: f32 = 0
+) -> Camera
+{
+    assert(height > 0)
+
+    return create_camera_base(
+        renderer, position, forward, up,
+        near, far,
+        Camera_Orthographic {
+            height = height,
+        },
+        yaw, pitch, roll
+    )
 }
 
 get_camera_view_matrix :: proc(camera: ^Camera) -> (linalg.Matrix4f32, bool) {
@@ -48,23 +116,50 @@ get_camera_projection_matrix :: proc(renderer: ^Renderer, camera: ^Camera) -> (l
     }
 
     projection_matrix := linalg.MATRIX4F32_IDENTITY
+
+    switch t in camera.type {
+        case Camera_Perspective: {
             projection_matrix *= linalg.matrix4_perspective(
-        linalg.to_radians(f32(camera.fov_degrees)),
+                linalg.to_radians(f32(t.fov_degrees)),
                 get_aspect_ratio(renderer),
                 camera.near,
                 camera.far,
                 flip_z_axis = true,
             )
+        }
+        case Camera_Orthographic: {
+            half_h := t.height / 2
+            half_w := half_h * get_aspect_ratio(renderer)
+
+            projection_matrix *= linalg.matrix_ortho3d(
+                -half_w, half_w,
+                -half_h, half_h,
+                camera.near,
+                camera.far,
+                flip_z_axis = true,
+            )
+        }
+    }
     
     return projection_matrix, true
 }
 
 rotate_camera :: proc(camera: ^Camera, yaw, pitch, roll: f32) {
-    pitch := clamp(pitch, -89.0, 89.0)
+    new_yaw   := camera.yaw   + yaw
+    new_pitch := camera.pitch + pitch
+    new_roll  := camera.roll  + roll
 
-    pitch_rad := linalg.to_radians(pitch)
-    yaw_rad   := linalg.to_radians(yaw)
-    roll_rad  := linalg.to_radians(roll)
+    set_camera_rotation(camera, new_yaw, new_pitch, new_roll)
+}
+
+set_camera_rotation :: proc(camera: ^Camera, yaw, pitch, roll: f32) {
+    camera.yaw   = yaw
+    camera.pitch = pitch
+    camera.roll  = roll
+
+    pitch_rad := linalg.to_radians(camera.pitch)
+    yaw_rad   := linalg.to_radians(camera.yaw)
+    roll_rad  := linalg.to_radians(camera.roll)
 
     camera.forward = [3]f32{
         math.cos(pitch_rad) * math.cos(yaw_rad),
@@ -73,9 +168,9 @@ rotate_camera :: proc(camera: ^Camera, yaw, pitch, roll: f32) {
     }
 
     WORLD_UP :: [3]f32{0, 1, 0}
+
     camera.right = linalg.normalize(linalg.cross(camera.forward, WORLD_UP))
     camera.up    = linalg.normalize(linalg.cross(camera.right, camera.forward))
-    // TODO: SS - Support 'roll'.
 }
 
 set_active_camera :: proc(renderer: ^Renderer, camera: ^Camera) {
@@ -83,5 +178,6 @@ set_active_camera :: proc(renderer: ^Renderer, camera: ^Camera) {
 }
 
 get_active_camera :: proc(renderer: ^Renderer) -> ^Camera {
+    assert(renderer != nil)
     return renderer.active_camera
 }

material.odin

@@ -1,7 +1,16 @@
 package renderer
 
 Material :: struct {
-    shader_program: Shader_Program,
-    texture: Texture, // Diffuse, normal etc later.
+    // 'Name'?
+    shader_program: ^Shader_Program,
+    texture: ^Texture, // Diffuse, normal etc later.
     // uniforms, textures, etc.
 }
+
+create_material :: proc(program: ^Shader_Program, texture0: ^Texture) -> (Material, bool) {
+    m: Material
+    m.shader_program = program
+    m.texture = texture0
+
+    return m, true
+}

mesh.odin

@@ -8,8 +8,13 @@ Mesh :: struct {
 Mesh_Handle     :: distinct u32
 Buffer_Handle   :: distinct u32
 
+Mesh_Layout :: struct {
+    name: string,
+    amount: u8,
+    type_size: u32,
+}
 
-create_mesh :: proc(renderer: ^Renderer, vertices: []f32, indices: []u32) -> (Mesh, bool) { // TODO: SS - Should probably return a Mesh_Handle.
+create_mesh :: proc(renderer: ^Renderer, layout: []Mesh_Layout, vertices: []f32, indices: []u32) -> (Mesh, bool) { // TODO: SS - Should probably return a Mesh_Handle.
     mesh: Mesh
 
     if len(vertices) == 0 {
@@ -23,7 +28,7 @@ create_mesh :: proc(renderer: ^Renderer, vertices: []f32, indices: []u32) -> (Me
     m.amount_of_indices = u32(len(indices))
     
     when RENDER_BACKEND_OPENGL {
-        opengl_mesh, ok := opengl_create_mesh(renderer, vertices, indices)
+        opengl_mesh, ok := opengl_create_mesh(renderer, layout, vertices, indices)
         if !ok {
             return {}, false
         }

pass.odin

@@ -2,35 +2,155 @@ package renderer
 
 import "core:fmt"
 
-MAX_DRAW_COMMANDS_PER_PASS :: 1024
+MAX_DRAW_COMMANDS_CAPACITY :: 4096
 
-Pass :: struct {
+PASS_MAX_INPUT_TEXTURES :: 8
+
+Scene_Pass :: struct {
     name: string,
-    clear_color: RGB_Color,
 
-    should_test_depth: bool,
-    should_clear_depth: bool,
+    input_textures: [PASS_MAX_INPUT_TEXTURES]^Texture, // TODO: SS - Make this a map?
+    input_texture_count: u8,
 
-    draw_commands: [MAX_DRAW_COMMANDS_PER_PASS]Draw_Command,
-    draw_command_count: u32,
+    output_rt: ^Render_Target,
+
+    draw_commands: [dynamic]Draw_Command, // Capacity is 'MAX_DRAW_COMMANDS_CAPACITY'.
+
+    clear_color: Maybe(RGB_Color),
+    blend_mode: Blend_Mode,
+    sort_mode: Sort_Mode,
+}
+
+Post_Processing_Pass :: struct {
+    name: string,
+    
+    input_texture: ^Texture, // TODO: SS - Make this an array of texture-pointers, or maybe a map.
+    input_depth_texture: ^Texture,
+    output_rt: ^Render_Target,
+
+    shader_program: Shader_Program,
 }
 
 Draw_Command :: struct {
+    renderer: ^Renderer, // Needed for sorting.
+
     mesh: Mesh,
     material: Material,
     position: [3]f32,
     rotation: [3]f32,
     scale: [3]f32,
-    // TODO: SS - Add rotation.
 }
 
-add_command_to_pass :: proc(pass: ^Pass, command: Draw_Command) -> bool {
-    if pass.draw_command_count >= len(pass.draw_commands) {
-        return false
+Blend_Mode :: enum {
+    None,
+    Alpha,
+    Additive,
+    Multiply,
 }
 
-    pass.draw_commands[pass.draw_command_count] = command
-    pass.draw_command_count += 1
+Blend_Factor :: enum {
+    Zero,
+	One,
+	Src_Color,
+	One_Minus_Src_Color,
+	Dst_Color,
+	One_Minus_Dst_Color,
+	Src_Alpha,
+	One_Minus_Src_Alpha,
+	Dst_Alpha,
+	One_Minus_Dst_Alpha,
+    // ..
+}
+
+Blend_Factors :: struct {
+    source, destination: Blend_Factor
+}
+
+@(private) BLEND_FACTOR_TABLE :: [Blend_Mode]Blend_Factors {
+    .None       = { .One, .Zero },
+    .Alpha      = { .Src_Alpha, .One_Minus_Src_Alpha },
+    .Additive   = { .Src_Alpha, .One },
+    .Multiply   = { .Dst_Color, .Zero },
+}
+
+Sort_Mode :: enum {
+    None, // Draws the commands in the order they're placed in the 'draw_commmands' array.
+    Back_To_Front, // Sorts the commands in the 'draw_commmands' array (from back to front) before drawing them.
+    Front_To_Back, // Sorts the commands in the 'draw_commmands' array (from front to back) before drawing them.
+}
+
+create_scene_pass :: proc(
+    name: string,
+    input_textures: []^Texture,
+    output_rt: ^Render_Target,
+    clear_color: Maybe(RGB_Color),
+    blend_mode: Blend_Mode,
+    sort_mode: Sort_Mode,
+) -> Scene_Pass
+{
+    // if input_depth_texture == nil {
+    //     if test_depth || clear_depth || write_depth {
+    //         assert(false)
+    //     }
+    // }
+
+    p := Scene_Pass {
+        name = name,
+
+        output_rt = output_rt,
+        
+        draw_commands = make([dynamic]Draw_Command, 0, MAX_DRAW_COMMANDS_CAPACITY),
+
+        clear_color = clear_color,
+        blend_mode = blend_mode,
+        sort_mode = sort_mode,
+    }
+    
+    for texture, i in input_textures {
+        if p.input_texture_count >= PASS_MAX_INPUT_TEXTURES {
+            fmt.printfln("Hit max capacity of textures per pass.")
+            break
+        }
+
+        p.input_textures[p.input_texture_count] = texture
+        p.input_texture_count += 1
+    }
+
+    return p
+}
+
+create_post_processing_pass :: proc(
+    name: string,
+    input_texture, input_depth_texture: ^Texture,
+    output_rt: ^Render_Target,
+    shader_program: Shader_Program,
+) -> Post_Processing_Pass
+{
+    return {
+        name = name,
+        input_texture = input_texture,
+        input_depth_texture = input_depth_texture,
+        output_rt = output_rt,
+        shader_program = shader_program,
+    }
+}
+
+delete_pass :: proc {
+    delete_scene_pass,
+}
+
+@(private) delete_scene_pass :: proc(pass: ^Scene_Pass) {
+    delete(pass.draw_commands)
+}
+
+add_command_to_pass :: proc(renderer: ^Renderer, pass: ^Scene_Pass, command: Draw_Command) -> bool {
+    assert(renderer != nil)
+    assert(pass != nil)
+
+    cmd := command
+    cmd.renderer = renderer
+    n, err := append(&pass.draw_commands, cmd)
+    assert(err == .None)
 
     return true
 }

pipeline.odin

@@ -3,45 +3,92 @@ package renderer
 import "core:mem"
 import "core:log"
 
-MAX_PASSES_IN_PIPELINE :: 8
+PIPELINE_MAX_SCENE_PASSES :: 8
+PIPELINE_MAX_POST_PROCESSING_PASSES :: 8
 
 Pipeline :: struct {
-    passes: [MAX_PASSES_IN_PIPELINE]^Pass,
-    amount_of_passes: u8,
+    scene_passes: [PIPELINE_MAX_SCENE_PASSES]^Scene_Pass,
+    amount_of_scene_passes: u8,
+
+    post_processing_passes: [PIPELINE_MAX_POST_PROCESSING_PASSES]^Post_Processing_Pass,
+    amount_of_post_processing_passes: u8,
+
+    fullscreen_material: ^Material,
+    fullscreen_mesh: ^Mesh,
 }
 
 clear_pipeline :: proc(renderer: ^Renderer) {
     assert(renderer != nil)
-    pipeline := &renderer.pipeline
+    p := &renderer.pipeline
     
-    pipeline.amount_of_passes = 0;
-    mem.set(&pipeline.passes[0], 0, MAX_PASSES_IN_PIPELINE * size_of(^Pass))
+    p.amount_of_scene_passes = 0;
+    mem.set(&p.scene_passes[0], 0, PIPELINE_MAX_SCENE_PASSES * size_of(^Scene_Pass))
+
+    p.amount_of_post_processing_passes = 0;
+    mem.set(&p.post_processing_passes[0], 0, PIPELINE_MAX_POST_PROCESSING_PASSES * size_of(^Post_Processing_Pass))
 }
 
-set_pipeline :: proc(renderer: ^Renderer, passes: []^Pass) {
-    clear_pipeline(renderer)
-    for p in passes {
-        if !add_pass_to_pipeline(renderer, p) {
-            return
-        }
-    }
-}
-
-@(private="file") add_pass_to_pipeline :: proc(renderer: ^Renderer, pass: ^Pass) -> bool {
+set_pipeline :: proc(
+    renderer: ^Renderer,
+    fullscreen_material: ^Material, fullscreen_mesh: ^Mesh,
+    scene_passes: []^Scene_Pass,
+    post_processing_passes: []^Post_Processing_Pass,
+){
     assert(renderer != nil)
-    assert(pass != nil)
+
+    clear_pipeline(renderer)
+
+    renderer.pipeline.fullscreen_material = fullscreen_material
+    renderer.pipeline.fullscreen_mesh = fullscreen_mesh
+    
+    for p in scene_passes {
+        if !add_pass_to_pipeline(renderer, p) {
+            break
+        }
+    }
+
+    for p in post_processing_passes {
+        if !add_pass_to_pipeline(renderer, p) {
+            break
+        }
+    }
+}
+
+add_pass_to_pipeline :: proc {
+    add_scene_pass_to_pipeline,
+    add_post_processing_pass_to_pipeline,
+}
+
+@(private="file") add_scene_pass_to_pipeline :: proc(renderer: ^Renderer, scene_pass: ^Scene_Pass) -> bool {
+    assert(renderer != nil)
+    assert(scene_pass != nil)
 
     pipeline := &renderer.pipeline
     
-    if pipeline.amount_of_passes == MAX_PASSES_IN_PIPELINE {
-        log.warnf("Failed to add pass '%v' to renderer's pipeline; hit max capacity (%v).", pass.name, MAX_PASSES_IN_PIPELINE)
+    if pipeline.amount_of_scene_passes == PIPELINE_MAX_SCENE_PASSES {
+        log.warnf("Failed to add scene-pass '%v' to renderer's pipeline; hit max capacity (%v).", scene_pass.name, PIPELINE_MAX_SCENE_PASSES)
         return false
     }
 
-    pipeline.passes[pipeline.amount_of_passes] = pass
-    pipeline.amount_of_passes += 1
-
-    // log.infof("Successfully added pass '%v' to pipeline.", pass.name)
+    pipeline.scene_passes[pipeline.amount_of_scene_passes] = scene_pass
+    pipeline.amount_of_scene_passes += 1
+
+    return true
+}
+
+@(private="file") add_post_processing_pass_to_pipeline :: proc(renderer: ^Renderer, post_processing_pass: ^Post_Processing_Pass) -> bool {
+    assert(renderer != nil)
+    assert(post_processing_pass != nil)
+
+    pipeline := &renderer.pipeline
+    
+    if pipeline.amount_of_post_processing_passes == PIPELINE_MAX_POST_PROCESSING_PASSES {
+        log.warnf("Failed to add post-processing pass '%v' to renderer's pipeline; hit max capacity (%v).", post_processing_pass.name, PIPELINE_MAX_POST_PROCESSING_PASSES)
+        return false
+    }
+
+    pipeline.post_processing_passes[pipeline.amount_of_post_processing_passes] = post_processing_pass
+    pipeline.amount_of_post_processing_passes += 1
 
     return true
 }

renderer.odin

@@ -1,5 +1,7 @@
 package renderer
 
+import "core:slice"
+import "core:sort"
 import "core:math/linalg"
 import "core:fmt"
 import "core:log"
@@ -75,9 +77,9 @@ set_viewport :: proc(renderer: ^Renderer, x, y, width, height: u16) {
     }
 }
 
-@(private="file") clear_screen :: proc(renderer: ^Renderer, clear_depth: bool) {
+@(private="file") clear_screen :: proc(renderer: ^Renderer, clear_color: bool, clear_depth: bool) {
     when RENDER_BACKEND_OPENGL {
-        opengl_clear_screen(renderer, clear_depth)
+        opengl_clear_screen(renderer, clear_color, clear_depth)
     }
 }
 
@@ -87,54 +89,103 @@ render_frame :: proc(renderer: ^Renderer) {
         return
     }
 
-    view_matrix, view_matrix_ok := get_camera_view_matrix(renderer.active_camera)
-    assert(view_matrix_ok)
-    projection_matrix, projection_matrix_ok := get_camera_projection_matrix(renderer, renderer.active_camera)
-    assert(projection_matrix_ok)
+    view_matrix, _       := get_camera_view_matrix(renderer.active_camera)
+    projection_matrix, _ := get_camera_projection_matrix(renderer, renderer.active_camera)
 
     pipeline := &renderer.pipeline
-    for i in 0 ..< pipeline.amount_of_passes {
-        pass := pipeline.passes[i]
 
-        set_clear_color(renderer, pass.clear_color)
-        clear_screen(renderer, pass.should_clear_depth)
-        enable_depth_testing(renderer, pass.should_test_depth)
-
-        for i in 0..<pass.draw_command_count {
-            command := &pass.draw_commands[i]
-            
-            model_matrix := linalg.identity(linalg.Matrix4x4f32)
-
-            // Translate.
-            translation := linalg.matrix4_translate(command.position)
-            
-            // Rotate.
-            rot_x := linalg.matrix4_rotate(linalg.to_radians(command.rotation.x), [3]f32 { 1, 0, 0 })
-            rot_y := linalg.matrix4_rotate(linalg.to_radians(command.rotation.y), [3]f32 { 0, 1, 0 })
-            rot_z := linalg.matrix4_rotate(linalg.to_radians(command.rotation.z), [3]f32 { 0, 0, 1 })
-            rotation := rot_z * rot_y * rot_x
-            
-            // Scale.
-            scale := linalg.matrix4_scale(command.scale)
-
-            model_matrix *= translation * rotation * scale
-
-            activate_material(&command.material, model_matrix, view_matrix, projection_matrix)
-
-            draw_mesh(&command.mesh)
+    for i in 0 ..< pipeline.amount_of_scene_passes {
+        execute_scene_pass(renderer, pipeline.scene_passes[i], view_matrix, projection_matrix)
     }
 
-        // TODO: SS - "Deactivate" the pass.
+    for i in 0 ..< pipeline.amount_of_post_processing_passes {
+        execute_post_processing_pass(renderer, pipeline.post_processing_passes[i], view_matrix, projection_matrix)
+    }
 
-        // Clear the pass' draw-commands.
-        pass.draw_command_count = 0
+    bind_render_target(renderer, nil) // Det görs ju här..
+
+    if pipeline.fullscreen_material != nil {
+        if pipeline.fullscreen_material.texture != nil {
+            activate_fullscreen_material(renderer)
+            
+            if pipeline.fullscreen_mesh != nil {
+                draw_mesh(pipeline.fullscreen_mesh)
+            }
+            else {
+                log.warn("Renderer is missing a fullscreen-mesh.")
+            }
+
+            deactivate_fullscreen_material(renderer)
+        }
+        else {
+            log.warn("Fullscreen-material does not have a texture.")
+        }
+    }
+    else {
+        log.warn("Renderer is missing a fullscreen-material.")
     }
 
     when RENDER_BACKEND_OPENGL {
         opengl_swap_buffers(renderer)
     }
+}
 
-    clear_screen(renderer, true)
+execute_scene_pass :: proc(renderer: ^Renderer, pass: ^Scene_Pass, view_matrix, projection_matrix: linalg.Matrix4x4f32) {
+    // fmt.printfln("Rendering pass '%v' to output_rt %v.", pass.name, pass.output_rt)
+
+    // TODO: SS - Use 'pass.input_textures'
+    
+    assert(pass.output_rt != nil)
+    bind_render_target(renderer, pass.output_rt)
+
+    should_write_depth := pass.output_rt.depth_texture != nil
+    should_test_depth  := should_write_depth
+    should_clear_depth := should_write_depth
+
+    cc, has_clear_color := pass.clear_color.?
+    if has_clear_color {
+        set_clear_color(renderer, cc)
+    }
+
+    should_clear_color := has_clear_color && pass.output_rt.color_texture != nil
+    
+    clear_screen(renderer, should_clear_color, should_clear_depth)
+    apply_depth(renderer, should_test_depth, should_write_depth)
+
+    apply_blend_mode(renderer, pass.blend_mode)
+
+    sort_draw_commands(renderer, pass)
+
+    for &dc in &pass.draw_commands { // TODO: SS - Don't think we need the address of the draw-commands.
+        model_matrix := linalg.identity(linalg.Matrix4x4f32)
+
+        // Translate.
+        translation := linalg.matrix4_translate(dc.position)
+        
+        // Rotate.
+        rot_x := linalg.matrix4_rotate(linalg.to_radians(dc.rotation.x), [3]f32 { 1, 0, 0 })
+        rot_y := linalg.matrix4_rotate(linalg.to_radians(dc.rotation.y), [3]f32 { 0, 1, 0 })
+        rot_z := linalg.matrix4_rotate(linalg.to_radians(dc.rotation.z), [3]f32 { 0, 0, 1 })
+        rotation := rot_z * rot_y * rot_x
+        
+        // Scale.
+        scale := linalg.matrix4_scale(dc.scale)
+
+        model_matrix *= translation * rotation * scale
+
+        activate_material(&dc.material, model_matrix, view_matrix, projection_matrix)
+
+        draw_mesh(&dc.mesh)
+    }
+
+    // TODO: SS - "Deactivate" the pass.
+
+    // Clear the pass' draw-commands.
+    clear(&pass.draw_commands)
+}
+
+execute_post_processing_pass :: proc(renderer: ^Renderer, pass: ^Post_Processing_Pass, view_matrix, projection_matrix: linalg.Matrix4x4f32) {
+    fmt.printfln("TODO: SS - Execute post-processing pass '%v'.", pass.name)
 }
 
 destroy :: proc(renderer: ^Renderer) {
@@ -154,6 +205,21 @@ destroy :: proc(renderer: ^Renderer) {
     }
 }
 
+@(private) activate_fullscreen_material :: proc(renderer: ^Renderer) {
+    assert(renderer != nil)
+    mat := renderer.pipeline.fullscreen_material
+    when RENDER_BACKEND_OPENGL {
+        opengl_activate_fullscreen_material(mat)
+    }
+}
+
+@(private) deactivate_fullscreen_material :: proc(renderer: ^Renderer) {
+    assert(renderer != nil)
+    when RENDER_BACKEND_OPENGL {
+        opengl_deactivate_fullscreen_material()
+    }
+}
+
 @(private) draw_mesh :: proc(mesh: ^Mesh) {
     assert(mesh != nil)
 
@@ -162,8 +228,89 @@ destroy :: proc(renderer: ^Renderer) {
     }
 }
 
-@(private) enable_depth_testing :: proc(renderer: ^Renderer, enable: bool) {
+@(private) apply_depth :: proc(renderer: ^Renderer, test_depth, write_depth: bool) {
     when RENDER_BACKEND_OPENGL {
-        opengl_enable_depth_testing(renderer, true)
+        opengl_apply_depth(renderer, test_depth, write_depth)
+    }
+}
+
+@(private) apply_blend_mode :: proc(renderer: ^Renderer, blend_mode: Blend_Mode) {
+    table := BLEND_FACTOR_TABLE
+
+    when RENDER_BACKEND_OPENGL {
+        opengl_set_blending(renderer, blend_mode != .None, table[blend_mode])
+    }
+}
+
+@(private) sort_draw_commands :: proc(renderer: ^Renderer, pass: ^Scene_Pass) {
+    switch pass.sort_mode {
+        case .None: {}
+        case .Back_To_Front: {
+            slice.sort_by(
+                pass.draw_commands[:],
+                proc(i, j: Draw_Command) -> bool {
+                    assert(i.renderer != nil)
+                    assert(j.renderer != nil)
+                    assert(i.renderer == j.renderer)
+
+                    active_camera := get_active_camera(i.renderer)
+                    if active_camera == nil {
+                        return false
+                    }
+
+                    i_dist := distance_to_camera(active_camera, i.position)
+                    j_dist := distance_to_camera(active_camera, j.position)
+                    
+                    return i_dist > j_dist
+                }
+            )
+        }
+        case .Front_To_Back: {
+            slice.sort_by(
+                pass.draw_commands[:],
+                proc(i, j: Draw_Command) -> bool {
+                    assert(i.renderer != nil)
+                    assert(j.renderer != nil)
+                    assert(i.renderer == j.renderer)
+                    
+                    active_camera := get_active_camera(i.renderer)
+                    if active_camera == nil {
+                        return false
+                    }
+
+                    i_dist := distance_to_camera(active_camera, i.position)
+                    j_dist := distance_to_camera(active_camera, j.position)
+                    
+                    return i_dist < j_dist
+                }
+            )
+        }
+    }
+}
+
+distance_to_camera :: proc(camera: ^Camera, position: [3]f32) -> f32 {
+    assert(camera != nil)
+    return linalg.distance(camera.position, position)
+}
+
+@(private) bind_framebuffer :: proc(renderer: ^Renderer, rt: ^Render_Target) -> bool {
+    // when RENDER_BACKEND_OPENGL {
+    //     return opengl_bind_framebuffer(renderer, rt)
+    // }
+
+    return false
+}
+
+@(private) bind_depth_texture :: proc(renderer: ^Renderer, rt: ^Render_Target) -> bool {
+    // when RENDER_BACKEND_OPENGL {
+    //     return opengl_bind_depth_texture(renderer, rt)
+    // }
+
+    return false
+}
+
+@(private) bind_render_target :: proc(renderer: ^Renderer, rt: ^Render_Target) {
+    when RENDER_BACKEND_OPENGL {
+        opengl_bind_render_target(renderer, rt)
     }
 }

renderer_backend_opengl_windows.odin

@@ -101,14 +101,15 @@ when RENDER_BACKEND_OPENGL {
         )
     }
     
-    opengl_clear_screen :: proc(renderer: ^Renderer, clear_depth: bool) {
-        mask := u32(gl.COLOR_BUFFER_BIT)
-        if clear_depth {
-            gl.ClearDepth(1.0)
-            mask |= gl.DEPTH_BUFFER_BIT
+    opengl_clear_screen :: proc(renderer: ^Renderer, clear_color: bool, clear_depth: bool) {
+        flags := u32(0)
+        if clear_color {
+            flags |= gl.COLOR_BUFFER_BIT  
         }
-
-        gl.Clear(mask)
+        if clear_depth {
+            flags |= gl.DEPTH_BUFFER_BIT
+        }
+        gl.Clear(flags)
     }
 
     opengl_swap_buffers :: proc(renderer: ^Renderer) {
@@ -127,6 +128,7 @@ when RENDER_BACKEND_OPENGL {
     Shader_Backend :: Shader_OpenGL
     Shader_Program_Backend :: Shader_Program_OpenGL
     Texture_Backend :: Texture_OpenGL
+    Render_Target_Backend :: Render_Target_OpenGL
 
     Mesh_OpenGL :: struct {
         vbo, vao, ebo: u32,
@@ -144,7 +146,11 @@ when RENDER_BACKEND_OPENGL {
         handle: u32,
     }
 
-    opengl_create_mesh :: proc(renderer: ^Renderer, vertices: []f32, indices: []u32) -> (Mesh_OpenGL, bool) {
+    Render_Target_OpenGL :: struct {
+        handle: u32,
+    }
+
+    opengl_create_mesh :: proc(renderer: ^Renderer, layout: []Mesh_Layout, vertices: []f32, indices: []u32) -> (Mesh_OpenGL, bool) {
         // fmt.printfln("OPENGL: Creating mesh from vertices: %v.", vertices)
         
         m: Mesh_OpenGL
@@ -161,14 +167,20 @@ when RENDER_BACKEND_OPENGL {
             gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, m.ebo)
             gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(indices) * size_of(u32), raw_data(indices), gl.STATIC_DRAW)
 
-            gl.VertexAttribPointer(0, 3, gl.FLOAT, gl.FALSE, 8 * size_of(f32), uintptr(0))
-            gl.EnableVertexAttribArray(0)
+            layout_total_stride := u32(0)
+            for l in layout {
+                layout_total_stride += u32(l.amount) * l.type_size;
+            }
 
-            gl.VertexAttribPointer(1, 3, gl.FLOAT, gl.FALSE, 8 * size_of(f32), uintptr(3 * size_of(f32)))
-            gl.EnableVertexAttribArray(1)
+            offset := u32(0)
+            for l, i in layout {
+                // NOTE: SS - Hardcoded to 'gl.FLOAT'
+                gl.VertexAttribPointer(u32(i), i32(l.amount), gl.FLOAT, gl.FALSE, i32(layout_total_stride), uintptr(offset))
+                gl.EnableVertexAttribArray(u32(i))
+
+                offset += u32(l.amount) * l.type_size
+            }
 
-            gl.VertexAttribPointer(2, 2, gl.FLOAT, gl.FALSE, 8 * size_of(f32), uintptr(6 * size_of(f32)))
-            gl.EnableVertexAttribArray(2)
         }
         gl.BindVertexArray(0)
         gl.BindBuffer(gl.ARRAY_BUFFER, 0)
@@ -260,72 +272,153 @@ when RENDER_BACKEND_OPENGL {
         gl.UniformMatrix4fv(projection_matrix_loc, 1, false, &projection_matrix_as_f32_array[0])
     }
 
+    opengl_activate_fullscreen_material :: proc(material: ^Material) {
+        assert(material != nil)
+        gl.UseProgram(material.shader_program.backend.handle)
+
+        gl.ActiveTexture(gl.TEXTURE0)
+        gl.BindTexture(gl.TEXTURE_2D, material.texture.backend.handle)
+
+        loc := gl.GetUniformLocation(material.shader_program.backend.handle, "texture0") // eller "uTex"
+        if loc != -1 {
+            gl.Uniform1i(loc, 0)
+        }
+
+        gl.Disable(gl.DEPTH_TEST)
+        gl.DepthMask(gl.FALSE)
+    }
+
+    opengl_deactivate_fullscreen_material :: proc() {
+        gl.DepthMask(gl.TRUE)
+        gl.Enable(gl.DEPTH_TEST)
+    }
+
     opengl_draw_mesh :: proc(mesh: ^Mesh) {
         gl.BindVertexArray(mesh.backend.vao)
         assert(mesh.amount_of_indices < u32(max(i32)))
         gl.DrawElements(gl.TRIANGLES, i32(mesh.amount_of_indices), gl.UNSIGNED_INT, nil)
     }
 
+    opengl_texture_format_from_texture :: proc(t: ^Texture) -> (u32, u32, u32) {
+        internal, format, type: u32
+
+        switch t.format {
+            case .R8: {
+                internal = gl.R8
+                format   = gl.RED
+                type     = gl.UNSIGNED_BYTE
+            }
+            case .R16F: {
+                internal = gl.R16F
+                format   = gl.RED
+                type     = gl.HALF_FLOAT
+            }
+            case .R32F: {
+                internal = gl.R32F
+                format   = gl.RED
+                type     = gl.FLOAT
+            }
+            case .RGBA8: {
+                internal = gl.RGBA8
+
+                if t.channels == 3 {
+                    format = gl.RGB
+                } else {
+                    format = gl.RGBA
+                }
+
+                type = gl.UNSIGNED_BYTE
+            }
+            case .RGBA16F: {
+                internal = gl.RGBA16F
+                format   = gl.RGBA
+                type     = gl.HALF_FLOAT
+            }
+            case .R11G11B10F: {
+                internal = gl.R11F_G11F_B10F
+                format   = gl.RGB
+                type     = gl.UNSIGNED_INT_10F_11F_11F_REV
+            }
+            case .Depth16: {
+                internal = gl.DEPTH_COMPONENT16
+                format   = gl.DEPTH_COMPONENT
+                type     = gl.UNSIGNED_SHORT
+            }
+            case .Depth24: {
+                internal = gl.DEPTH_COMPONENT24
+                format   = gl.DEPTH_COMPONENT
+                type     = gl.UNSIGNED_INT
+            }
+            case .Depth32F: {
+                internal = gl.DEPTH_COMPONENT32F
+                format   = gl.DEPTH_COMPONENT
+                type     = gl.FLOAT
+            }
+            case .Depth24_Stencil8: {
+                internal = gl.DEPTH24_STENCIL8
+                format   = gl.DEPTH_STENCIL
+                type     = gl.UNSIGNED_INT_24_8
+            }
+            case .Depth32F_Stencil8: {
+                internal = gl.DEPTH32F_STENCIL8
+                format   = gl.DEPTH_STENCIL
+                type     = gl.FLOAT_32_UNSIGNED_INT_24_8_REV
+            }
+        }
+
+        return internal, format, type
+    }
+
+
     opengl_load_texture :: proc(renderer: ^Renderer, t: ^Texture, pixels: rawptr) -> bool {
         handle: u32
         gl.GenTextures(1, &handle)
         gl.BindTexture(gl.TEXTURE_2D, handle)
 
-        gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
-        gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
+        switch t.filter_mode {
+            case .Nearest:
+                gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
+                gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
+            case .Linear:
+                gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
+                gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
+            case .Nearest_MipMap:
+                gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST_MIPMAP_NEAREST)
+                gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
+            case .Linear_MipMap:
                 gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
                 gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
-
-        type := gl.UNSIGNED_BYTE
-        switch t.depth {
-            case 8: type = gl.UNSIGNED_BYTE
-            case 16: type = gl.UNSIGNED_SHORT
-            case 32: type = gl.UNSIGNED_INT
         }
 
-        format := gl.RGBA
-        switch t.channels {
-            case 1: format = gl.RED
-            case 2: format = gl.RG
-            case 3: format = gl.RGB
-            case 4: format = gl.RGBA
+        switch t.wrap_mode {
+            case .Clamp:
+                gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP)
+                gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP)
+            case .Repeat:
+                gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
+                gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
+            case .Mirror:
+                gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.MIRRORED_REPEAT)
+                gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.MIRRORED_REPEAT)
         }
 
-        internal := gl.RGBA8
-
-        if t.depth == 8 {
-            switch t.channels {
-                case 1: internal = gl.R8
-                case 2: internal = gl.RG8
-                case 3: internal = gl.RGB8
-                case 4: internal = gl.RGBA8
-            }
-        } else if t.depth == 16 {
-            switch t.channels {
-                case 1: internal = gl.R16
-                case 2: internal = gl.RG16
-                case 3: internal = gl.RGB16
-                case 4: internal = gl.RGBA16
-            }
-        }
-        
-        // bytes.reverse(bytes.buffer_to_bytes(img.pixels))
+        internal_format, format, type := opengl_texture_format_from_texture(t)
 
         gl.TexImage2D(
-            target          = gl.TEXTURE_2D,
-            level           = 0,
-            internalformat  = i32(internal),
-            width           = i32(t.width),
-            height          = i32(t.height),
-            border          = 0,
-            format          = u32(format),
-            type            = u32(type),
-            pixels          = pixels,
-            // pixels          = &pixels[0]
-            // pixels          = &bytes.reverse(bytes.buffer_to_bytes(&img.pixels))[0]
+            gl.TEXTURE_2D,
+            0,
+            i32(internal_format),
+            i32(t.width),
+            i32(t.height),
+            0,
+            u32(format),
+            u32(type),
+            pixels,
         )
 
+        if !t.is_depth {
             gl.GenerateMipmap(gl.TEXTURE_2D)
+        }
 
         t.backend = Texture_OpenGL { handle = handle }
         return true
@@ -335,12 +428,105 @@ when RENDER_BACKEND_OPENGL {
         gl.DeleteTextures(1, &t.backend.handle)
     }
 
-    opengl_enable_depth_testing :: proc(renderer: ^Renderer, enable: bool) {
-        if enable {
+    opengl_apply_depth :: proc(renderer: ^Renderer, test_depth, write_depth: bool) {
+        if test_depth {
             gl.Enable(gl.DEPTH_TEST)
         }
         else {
             gl.Disable(gl.DEPTH_TEST)
         }
+
+        gl.DepthMask(write_depth)
     }
+
+    @(private="file") OPENGL_BLEND_FACTOR_U32_TABLE :: [Blend_Factor]u32 {
+        .Zero = gl.ZERO,
+        .One = gl.ONE,
+        // Color.
+        .Src_Color = gl.SRC_COLOR,
+        .One_Minus_Src_Color = gl.ONE_MINUS_SRC_COLOR,
+        .Dst_Color = gl.DST_COLOR,
+        .One_Minus_Dst_Color = gl.ONE_MINUS_DST_COLOR,
+        // Alpha.
+        .Src_Alpha = gl.SRC_ALPHA,
+        .One_Minus_Src_Alpha = gl.ONE_MINUS_SRC_ALPHA,
+        .Dst_Alpha = gl.DST_ALPHA,
+        .One_Minus_Dst_Alpha = gl.ONE_MINUS_DST_ALPHA,
+    }
+
+    opengl_set_blending :: proc(renderer: ^Renderer, enable: bool, factors: Blend_Factors) {
+        if enable {
+            gl.Enable(gl.BLEND)
+        }
+        else {
+            gl.Disable(gl.BLEND)
+            // Not sure that I want to return here.. Pretty nice that the blendfunc gets reset correctly even if we're disabling blending.
+        }
+
+        table := OPENGL_BLEND_FACTOR_U32_TABLE
+
+        gl.BlendFunc(
+            sfactor = table[factors.source],
+            dfactor = table[factors.destination],
+        )
+    }
+
+    opengl_bind_render_target :: proc(renderer: ^Renderer, rt: ^Render_Target) {
+        if rt == nil {
+            gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
+
+            gl.Viewport(
+                0,
+                0,
+                i32(renderer.viewport.width),
+                i32(renderer.viewport.height),
+            )
+
+            return
+        }
+
+        gl.BindFramebuffer(gl.FRAMEBUFFER, rt.backend.handle)
+
+        gl.Viewport(
+            0,
+            0,
+            i32(rt.color_texture.width),
+            i32(rt.color_texture.height),
+        )
+    }
+
+    opengl_create_render_target :: proc(renderer: ^Renderer, rt: ^Render_Target) -> bool {
+        fb: u32
+        gl.GenFramebuffers(1, &fb)
+        gl.BindFramebuffer(gl.FRAMEBUFFER, fb)
+
+        gl.FramebufferTexture2D(
+            gl.FRAMEBUFFER,
+            gl.COLOR_ATTACHMENT0,
+            gl.TEXTURE_2D,
+            rt.color_texture.backend.handle,
+            0
+        )
+
+        if rt.depth_texture != nil {
+            gl.FramebufferTexture2D(
+                gl.FRAMEBUFFER,
+                gl.DEPTH_ATTACHMENT,
+                gl.TEXTURE_2D,
+                rt.depth_texture.backend.handle,
+                0
+            )
+        }
+
+        if gl.CheckFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE {
+            fmt.printfln("Framebuffer status: %v", gl.CheckFramebufferStatus(gl.FRAMEBUFFER))
+            return false
+        }
+
+        rt.backend = Render_Target_OpenGL {
+            handle = fb
+        }
+        return true
+    }
+
 }

texture.odin

@@ -6,20 +6,61 @@ import "vendor:stb/image"
 import "core:fmt"
 
 Texture :: struct {
-    width, height, channels, depth: u32,
+    width, height, depth, channels: u16,
+
+    format: Texture_Format,
+    filter_mode: Texture_Filter_Mode,
+    wrap_mode: Texture_Wrap_Mode,
+    is_depth: bool,
+    
     backend: Texture_Backend,
 }
 
+Texture_Format :: enum {
+	RGBA8,
+	RGBA16F,
+	R11G11B10F,
+
+	R8,
+	R16F,
+	R32F,
+
+	Depth16,
+	Depth24,
+	Depth32F,
+	Depth24_Stencil8,
+	Depth32F_Stencil8,
+}
+
+Render_Target :: struct {
+    color_texture, depth_texture: ^Texture,
+    backend: Render_Target_Backend,
+}
+
+Texture_Filter_Mode :: enum {
+    Nearest,
+    Linear,
+    Nearest_MipMap,
+    Linear_MipMap,
+}
+
+Texture_Wrap_Mode :: enum {
+    Clamp,
+    Repeat,
+    Mirror,
+}
+
 create_texture :: proc {
     create_texture_from_path,
+    create_texture_raw,
 }
 
-create_texture_from_path :: proc(renderer: ^Renderer, path: string) -> (Texture, bool) {
-    width, height, depth, channels: c.int
+create_texture_from_path :: proc(renderer: ^Renderer, path: string, filter_mode := Texture_Filter_Mode.Linear, wrap_mode := Texture_Wrap_Mode.Repeat) -> (Texture, bool) {
+	width, height, channels, depth: c.int
 
 	path_cstr := strings.clone_to_cstring(path)
 	defer delete(path_cstr)
-    image.set_flip_vertically_on_load(1) // NOTE: SS - This should not necessarily happen on all graphics-apis.
+	image.set_flip_vertically_on_load(1)
 	data := image.load(path_cstr, &width, &height, &channels, desired_channels = 0)
 	if data == nil {
 		return {}, false
@@ -27,23 +68,72 @@ create_texture_from_path :: proc(renderer: ^Renderer, path: string) -> (Texture,
 	depth = 8
 
 	t: Texture
-    t.width     = u32(width)
-    t.height    = u32(height)
-    t.channels  = u32(channels)
-    t.depth     = u32(depth)
+	t.width       = u16(width)
+	t.height      = u16(height)
+	t.filter_mode = filter_mode
+	t.wrap_mode   = wrap_mode
+	t.depth       = u16(depth)
+	t.channels    = u16(channels)
+
+	switch channels {
+        case 1: {
+            t.format = .R8
+        }
+        case 3: {
+            t.format = .RGBA8
+        }
+        case 4: {
+            t.format = .RGBA8
+        }
+        case: {
+            t.format = .RGBA8
+        }
+	}
 
 	when RENDER_BACKEND_OPENGL {
 		if !opengl_load_texture(renderer, &t, data) {
 			return {}, false
 		}
 	}
-    else {
+
+	return t, true
+}
+
+
+create_texture_raw :: proc(renderer: ^Renderer, width, height: u16, format: Texture_Format, filter_mode: Texture_Filter_Mode, wrap_mode: Texture_Wrap_Mode, is_depth: bool = false) -> (Texture, bool) {    t: Texture
+    t.width  = width
+    t.height = height
+    t.format = format
+    t.filter_mode = filter_mode
+    t.wrap_mode = wrap_mode
+    t.is_depth = is_depth
+
+    when RENDER_BACKEND_OPENGL {
+        if !opengl_load_texture(renderer, &t, nil) {
+            return {}, false
+        }
+    } else {
         #assert(false)
     }
 
     return t, true
 }
 
+create_render_target :: proc(renderer: ^Renderer, color_texture, depth_texture: ^Texture) -> (Render_Target, bool) {
+    rt: Render_Target
+    rt.color_texture = color_texture
+    rt.depth_texture = depth_texture
+
+    when RENDER_BACKEND_OPENGL {
+        if !opengl_create_render_target(renderer, &rt) {
+            return {}, false
+        }
+    }
+
+    return rt, true
+}
+
+
 delete_texture :: proc(renderer: ^Renderer, texture: ^Texture) {
     when RENDER_BACKEND_OPENGL {
         opengl_delete_texture(renderer, texture)