shader/quad/shader.frag

@@ -53,6 +53,6 @@ void main()
     float kSigma = 7.0;
     float threshold = 0.3;
 
-    //FragColor = denoise(ourTexture, TexCoord, sigma, kSigma, threshold);
+    FragColor = denoise(ourTexture, TexCoord, sigma, kSigma, threshold);
-    FragColor = texture(ourTexture, TexCoord);
+    //FragColor = texture(ourTexture, TexCoord);
 }

shader/root/rt.glsl

@@ -108,8 +108,6 @@ void main()
 
     pixel.xyz = mix(pixel.xyz, vec3(1.0), depth);
 
-    pixel.xyz = texture(_noise, uv*.5-.5).xyz;
-
     // output to a specific pixel in the image
     imageStore(img_output, ivec2(gl_GlobalInvocationID.xy), pixel);
 }

src/gfx.c

@@ -1,4 +1,5 @@
 #include "gfx.h"
+#include "random.h"
 
 float vertices[] = {
     // position             color               uvs
@@ -195,6 +196,7 @@ int createTextures(int width, int height, struct Shaders shaders, struct Texture
     return 0;
 }
 
+// creates a noise texture in active texture 1
 GLuint createNoiseTexture(int width, int height)
 {
     // same init steps as with a regular texture
@@ -210,10 +212,14 @@ GLuint createNoiseTexture(int width, int height)
 
     int channels = 4; // rgba
     int length = width*height*channels;
+    printf("generating %d random floats\n", length);
+
     float* data = (float*)malloc(length*sizeof(float));
 
-    //writeWhiteNoiseToTexture(data, width, height);
+    for (int i = 0; i < length; i++)
-    writeBlueNoiseToTexture(data, width, height);
+    {
+        data[i] = randomFloat();
+    }
 
     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, width, height, 0, GL_RGBA, GL_FLOAT, data);
     glBindImageTexture(0, texture, 0, GL_FALSE, 0, GL_READ_ONLY, GL_RGBA32F);

src/gfx.h

@@ -7,7 +7,7 @@
 #include <SDL2/SDL_opengl.h>
 
 #include "io.h"
-#include "noise.h"
+#include "random.h"
 
 struct Shaders
 {

src/noise.c

@@ -1,131 +0,0 @@
-#include "noise.h"
-
-void writeWhiteNoiseToTexture(float* data, int width, int height)
-{
-    int channels = 4; // rgba
-    int length = width*height*channels;
-
-    printf("generating %d random floats\n", length);
-    for (int i = 0; i < length; i++)
-    {
-        data[i] = randomFloat();
-    }
-}
-
-void generateBlueNoisePoints(vec2* points, int m, int n)
-{
-    float start = now();
-    float elapsed;
-    int candidatesTested = 0;
-
-    struct Candidate
-    {
-        vec2 pos;
-        // distance to closest point already in pattern
-        float distance;
-    };
-
-    for (int i = 0; i < n; i++)
-    {
-        // generate a bunch of candidates
-        int count = m * i;
-        struct Candidate candidates[count];
-
-        for (int j = 0; j < count; j++)
-        {
-            struct Candidate* c = &candidates[j];
-
-            c->pos[0] = randomFloat();
-            c->pos[1] = randomFloat();
-            // the largest distance we should expect is sqrt(2),
-            // so pick a maximum larger than that
-            c->distance = 1.5; 
-
-            // get the distance of the closest point already in the pattern
-            for (int k = 0; k < i; k++)
-            {
-                float distance = glm_vec2_distance(c->pos, points[k]);
-                if (distance < c->distance)
-                {
-                    c->distance = distance;
-                }
-            }
-
-            candidatesTested += i;
-
-            float killAfter = 10.0;
-            elapsed = now() - start;
-            if (elapsed > killAfter)
-            {
-                printf("noise generation took too long (%fs), exiting\n", elapsed);
-                exit(1);
-            }
-        }
-
-        // of our candidates, now determine which of them has the furthest
-        // closest-distance
-        int furthest = -1;
-        float furthestDistance = 0.0;
-        for (int j = 0; j < count; j++)
-        {
-            if (candidates[j].distance > furthestDistance)
-            {
-                furthest = j;
-                furthestDistance = candidates[j].distance;
-            }
-        }
-
-        glm_vec2_copy(candidates[furthest].pos, points[i]);
-    }
-
-    elapsed = now() - start;
-    printf("generated %d blue noise (m=%d) points from %d candidates in %fs\n",
-        n,
-        m,
-        candidatesTested,
-        elapsed);
-}
-
-void writeBlueNoiseToTexture(float* data, int width, int height)
-{
-    printf("generating blue noise\n");
-    int channels = 4;
-
-    // blue noise gen parameters
-    int m = 10;     // roughly controls the evenness...?
-    int n = 100;    // number of points to generate
-
-    // for each channel
-    for (int channel = 0; channel < channels; channel++)
-    {
-        // generate a bunch of points
-        vec2 points[n];
-        generateBlueNoisePoints(points, m, n);
-
-        for (int i = 0; i < width*height; i++)
-        {
-            int pixelIdx = i;
-            int x = pixelIdx % width;
-            int y = pixelIdx / width;
-            float u = x / (float)width;
-            float v = y / (float)height;
-            vec2 pixel = {u,v};
-
-            //float value = 0.0f;
-            int componentIdx = i * channels + channel;
-            for (int j = 0; j < n; j++)
-            {
-                float d = glm_vec2_distance(points[j], pixel);
-                //value += 1.0f / (d*d);
-
-                float r = 0.01;
-                if (d < r)
-                {
-                    data[componentIdx] = 1.0;
-                }
-            }
-            //data[componentIdx] = value / (float)n;
-        }
-    }
-}
-

src/noise.h

@@ -1,13 +0,0 @@
-#pragma once
-
-#include "GL/glew.h"
-#include <cglm/vec2.h>
-
-#include "io.h"
-#include "random.h"
-#include "clock.h"
-
-void writeWhiteNoiseToTexture(float* data, int width, int height);
-
-void generateBlueNoisePoints(vec2* points, int m, int n);
-void writeBlueNoiseToTexture(float* data, int width, int height);