way improved post processing

src/editor/textureDebugger.jai

@@ -59,6 +59,12 @@ draw_subwindow_post_process :: (state: *GR.Subwindow_State, r: GR.Rect, data: *v
             file.write_entire_file("./game/resources/postprocess.json", json);
         }
     }
+    r3.y += r3.h;
+    r2.h -= r3.h;
+    r2.y += r3.h;
+
+    
+    GR.dropdown(r3, LUT_name_list, *g_current_lut_texture_index, *theme_ptr.dropdown_theme);
 
     autoedit(r2, *current_post_process, *theme_ptr);
 }

src/main.jai

@@ -121,6 +121,7 @@ init_after_asset_pack :: () {
     lworlds();
     init_spritesheets();
     init_rendering();
+    load_color_lut_images();
     load_post_process_from_pack();
 
     // We want to do this last.

src/rendering/backend_sokol.jai

@@ -327,16 +327,10 @@ backend_process_command_buckets :: () {
     // Draw the render texture and do post processing:
     sg_apply_pipeline(gPipelines.postprocess.pipeline);
     gPipelines.postprocess.bind.images[0] = g_postprocess_a;
+    gPipelines.postprocess.bind.images[1] = LUT_list[g_current_lut_texture_index].image;
     sg_apply_bindings(*gPipelines.postprocess.bind);
     post_process_config_uniform : Post_Process_Config;
     fill_uniform_with_engine_data(*post_process_config_uniform , *current_post_process);
-    post_process_config_uniform.vignette_intensity = current_post_process.vignette_intensity;
-    post_process_config_uniform.vignette_radius = current_post_process.vignette_radius;
-    post_process_config_uniform.scanlines_intensity = current_post_process.scanlines_intensity;
-    post_process_config_uniform.scanlines_density = current_post_process.scanlines_density;
-    post_process_config_uniform.chromatic_aberration_intensity = current_post_process.chromatic_aberration_intensity;
-    post_process_config_uniform.film_grain_intensity = current_post_process.film_grain_intensity;
-    post_process_config_uniform.barrel_distortion_intensity = current_post_process.barrel_distortion_intensity;
     sg_apply_uniforms(UB_post_process_config, *(sg_range.{ ptr = *post_process_config_uniform, size = size_of(type_of(post_process_config_uniform)) }));
     sg_draw(0, 6, 1);    
 

src/rendering/pipelines.jai

@@ -690,6 +690,13 @@ create_postprocess_pipeline :: () {
         mag_filter = .NEAREST,
     }));
 
+    gPipelines.postprocess.bind.samplers[1] = sg_make_sampler(*(sg_sampler_desc.{
+        wrap_u = .CLAMP_TO_EDGE,
+        wrap_v = .CLAMP_TO_EDGE,
+        min_filter = .LINEAR,
+        mag_filter = .LINEAR,
+    }));
+
 }
 
 // Takes in a texture, manipulates it and outputs it.

src/rendering/post_processing.jai

@@ -1,8 +1,8 @@
 Post_Process :: struct {
-    exposure          : float = 0.0; @Slider,-1,1,0.1;
-    contrast          : float = 1.0; @Slider,0.1,4.0,0.1;
+    exposure          : float = 0.0; @Slider,0,3,0.1;
+    contrast          : float = 1.0; @Slider,0,6,0.1;
     saturation        : float = 1.0; @Slider,0.0,2.0,0.1;
-    gamma             : float = 1.0; @Slider,0.3,3.0,0.1;
+    gamma             : float = 2.2; @Slider,0.3,3.0,0.1;
     tonemap           : float = 1.0; @Slider,0,1,1;
     ssao              : float = 1.0; @Slider,0,5,0.1;
     ssao_size         : s32   = 1;   @Slider,0,5,1;
@@ -16,8 +16,9 @@ Post_Process :: struct {
     dof_point         : float = 5.0; @Slider,0,30,1;
     bloom_size        : s32   = 5;   @Slider,0,10,1;
     bloom_separation  : float = 3.0; @Slider,0,10,1;
-    bloom_treshold   : float = 0.4; @Slider,0,1,0.1;
+    bloom_treshold    : float = 0.4; @Slider,0,1,0.1;
     bloom_amount      : float = 1.0; @Slider,0,5,0.1;
+    
     vignette_intensity: float = 0.5; @Slider,0,1,0.1;
     vignette_radius: float = 0.5; @Slider,0,1,0.1;
     scanlines_intensity: float = 0.1; @Slider,0,1,0.1;
@@ -25,8 +26,10 @@ Post_Process :: struct {
     chromatic_aberration_intensity: float = 0.0; @Slider,0,0.05,0.001;
     film_grain_intensity: float = 0.0; @Slider,0,0.5,0.001;
     barrel_distortion_intensity: float = 0.0; @Slider,-2,2,0.1;
+    lut_mode: s32 = 0; @Slider,0,2,1; // 0 -> no LUT, 1 -> LUT with interpolation 2 -> LUT no iterpolate
 }
 
+
 current_post_process : Post_Process;
 
 load_post_process_from_pack :: () {
@@ -40,3 +43,29 @@ load_post_process_from_pack :: () {
 reset_post_process :: () {
     load_post_process_from_pack();
 } @Command
+
+Color_LUT :: struct {
+    name:  string;
+    image: sg_image;
+}
+
+LUT_list      : [..]Color_LUT;
+LUT_name_list : [..]string;
+g_current_lut_texture_index : s32 = 0;
+
+load_color_lut_images :: () {
+    for v : g_asset_pack.lookup {
+        isSpritesheet := String.contains(v.name, ".colorgrade.png");
+        noop, remainder := String.contains(v.name, "/resources/");
+        if isSpritesheet {
+            print("Adding LUT: %\n", remainder);
+            img, w, h := create_texture_from_pack(v.name);
+            newSheet := Color_LUT.{
+                name  = remainder,
+                image = img,
+            };
+            array_add(*LUT_list, newSheet);
+            array_add(*LUT_name_list, newSheet.name);
+        }
+    }
+}

src/shaders/shader_post_process_main.glsl

@@ -16,6 +16,8 @@ out vec4 frag_color;
 
 layout(binding = 0) uniform texture2D pptex;
 layout(binding = 0) uniform sampler ppsmp;
+layout(binding = 1) uniform texture2D lut;
+layout(binding = 1) uniform sampler lut_linear;
 
 layout(binding=0) uniform post_process_config {
     float exposure;
@@ -30,6 +32,7 @@ layout(binding=0) uniform post_process_config {
     float chromatic_aberration_intensity;
     float film_grain_intensity;
     float barrel_distortion_intensity;
+    int   lut_mode;
 };
 
 vec3 aces(vec3 x) {
@@ -59,37 +62,66 @@ void main() {
         }
     }
 
-    vec4 sampled = vec4(0.0);
     float r = texture(sampler2D(pptex, ppsmp), distorted_texcoord + vec2(chromatic_aberration_intensity, 0.0)).r;
     float g = texture(sampler2D(pptex, ppsmp), distorted_texcoord).g;
     float b = texture(sampler2D(pptex, ppsmp), distorted_texcoord - vec2(chromatic_aberration_intensity, 0.0)).b;
-    sampled = vec4(r, g, b, 1.0);
+    vec3 sampled_color_hdr = vec4(r, g, b, 1.0).rgb;
 
-    vec3 tonemapped = aces(sampled.xyz);
+    
+    vec3 color_hdr = sampled_color_hdr * exposure;
+
+    vec3 color_ldr_linear;
     if(tonemap > 0.5) {
-        tonemapped = aces(sampled.xyz);
+        color_ldr_linear = aces(color_hdr);
     } else {
-        tonemapped = sampled.xyz;
+        color_ldr_linear = color_hdr;
     }
-    // tonemapped *= pow(2.0, exposure);
-    vec3 gammaCorrected = pow(tonemapped, vec3(1.0/gamma));
-    gammaCorrected.rgb = ((gammaCorrected.rgb - 0.5f) * max(contrast, 0)) + 0.5f;
-    gammaCorrected.rgb += exposure;
 
-    float lum = (0.2125 * gammaCorrected.r) + (0.7154 * gammaCorrected.g) + (0.0721 * gammaCorrected.b);
+    color_ldr_linear = ((color_ldr_linear - 0.5f) * max(contrast, 0)) + 0.5f;
+
+    float lum = dot(color_ldr_linear, vec3(0.2125, 0.7154, 0.0721));
     vec3 brtColor = vec3(lum, lum, lum);
-    gammaCorrected.rgb = mix(brtColor, gammaCorrected.rgb, saturation);
+    color_ldr_linear = mix(brtColor, color_ldr_linear, saturation);
 
+    color_ldr_linear = clamp(color_ldr_linear, 0.0, 1.0);
+    
+    if(lut_mode != 0) {
+        if(lut_mode == 2) {
+            float u = floor(color_ldr_linear.b * 15.0) * (1.0/16.0);
+            u = u + floor(color_ldr_linear.r * 15.0) * (1.0/256.0);
+            float v = floor(color_ldr_linear.g * 15.0) * (1.0 / 16.0);
+            vec3 left  = texture(sampler2D(lut, ppsmp), vec2(u, v)).rgb;
+           color_ldr_linear = left;
+        } else {
+            float b_scaled = color_ldr_linear.b * 15.0;
+            float b_floor = floor(b_scaled);
+            float b_fract = b_scaled - b_floor; // fract(b_scaled)
+
+            float v = (color_ldr_linear.g * 15.0 + 0.5) / 16.0;
+
+            float u1 = (b_floor * 16.0 + color_ldr_linear.r * 15.0 + 0.5) / 256.0;
+            vec3 sample1 = texture(sampler2D(lut, lut_linear), vec2(u1, v)).rgb;
+
+            float b_ceil = min(b_floor + 1.0, 15.0); // Clamp to last slice
+            float u2 = (b_ceil * 16.0 + color_ldr_linear.r * 15.0 + 0.5) / 256.0;
+            vec3 sample2 = texture(sampler2D(lut, lut_linear), vec2(u2, v)).rgb;
+
+            color_ldr_linear = mix(sample1, sample2, b_fract);
+        }
+    }
+
+    vec3 color_srgb = pow(color_ldr_linear, vec3(1.0 / gamma));
+    
     float vignette = 1.0 - smoothstep(0.0, vignette_radius, length(texcoord - vec2(0.5))) * vignette_intensity;
-    gammaCorrected.rgb *= vignette;
+    color_srgb *= vignette;
 
     float scanline = 1.0 - (sin(texcoord.y * textureSize(sampler2D(pptex, ppsmp), 0).y * scanlines_density) * 0.5 + 0.5) * scanlines_intensity;
-    gammaCorrected.rgb *= scanline;
+    color_srgb *= scanline;
 
     float grain = (rand(texcoord) - 0.5) * film_grain_intensity;
-    gammaCorrected.rgb += grain;
+    color_srgb += grain;
     
-    frag_color = vec4(gammaCorrected, 1.0);
+    frag_color = vec4(clamp(color_srgb, 0.0, 1.0), 1.0);
 }
 @end
 

src/world.jai

@@ -81,6 +81,9 @@ World_Config :: struct {
     planeType     : s32   = 1; @Slider,0,1,1
     waterColor    : Vector3 = .{1.0, 1.0, 1.0}; @Color // @ToDo: sensible default values.
     deepColor     : Vector3 = .{1.0, 1.0, 1.0}; @Color // @ToDo: sensible default values. 
+    
+    // ambientColor     : Vector3 = .{1.0, 1.0, 1.0}; @Color
+    // ambientIntensity : float   = 0.3; @Slider,0,3,0.1
 
 }