From 9d3cdc7f5ee96c3b2a9342e44b62102f5b05be3b Mon Sep 17 00:00:00 2001 From: Matthias Schiffer Date: Mon, 1 Feb 2016 14:03:21 +0100 Subject: Add glslwrite tool and some examples --- examples/polygon.frag | 54 ++++++++++++++++++++++++++++++ examples/snail.frag | 41 +++++++++++++++++++++++ examples/square-in-circle.frag | 66 +++++++++++++++++++++++++++++++++++++ examples/square-in-square.frag | 74 ++++++++++++++++++++++++++++++++++++++++++ examples/square-ring.frag | 41 +++++++++++++++++++++++ examples/square-ring2.frag | 47 +++++++++++++++++++++++++++ examples/squares.frag | 42 ++++++++++++++++++++++++ examples/supersnail.frag | 37 +++++++++++++++++++++ examples/torus.frag | 41 +++++++++++++++++++++++ 9 files changed, 443 insertions(+) create mode 100644 examples/polygon.frag create mode 100644 examples/snail.frag create mode 100644 examples/square-in-circle.frag create mode 100644 examples/square-in-square.frag create mode 100644 examples/square-ring.frag create mode 100644 examples/square-ring2.frag create mode 100644 examples/squares.frag create mode 100644 examples/supersnail.frag create mode 100644 examples/torus.frag (limited to 'examples') diff --git a/examples/polygon.frag b/examples/polygon.frag new file mode 100644 index 0000000..20d5cdc --- /dev/null +++ b/examples/polygon.frag @@ -0,0 +1,54 @@ +#version 330 + +out vec4 fragColor; + +uniform vec2 res; +uniform float time; + +const float sharpness = 300; + +const float PI = 3.14159265358979323846; + + +mat2 rot(float a) { + return mat2( + cos(a), -sin(a), + sin(a), cos(a) + ); +} + +float poly(float n, vec2 m, float r, float rt, vec2 p) { + vec2 diff = (m - p) * rot(rt); + float d = length(diff); + float alpha = PI / n; + float gamma = mod(abs(atan(diff.x, diff.y)), alpha*2); + + if (gamma > alpha) + gamma -= 2*alpha; + + float r2 = r * cos(alpha) / cos(gamma); + + return clamp((r2 - d)*sharpness, 0.0, 1.0); +} + +float poly_d(float n, vec2 m, float r, float rt, vec2 p) { + return poly(n, m, r, rt, p) - poly(n, m, r - 1/sharpness, rt, p); +} + +void main(void) { + vec2 m = res/2; + float s = min(m.x, m.y); + vec2 p = (gl_FragCoord.xy - m) / s; + + float scene = 0; + + float c; + + c = poly_d(5 - 3*cos(time/1000), vec2(0, 0), 0.5, PI * time/1000, p); + scene = abs(scene - c); + + c = poly_d(5 - 3*cos(time/1000), vec2(0, 0), 0.5, -PI * time/1000, p); + scene = abs(scene - c); + + fragColor = vec4(vec3(1, 1, 1) * scene, 1); +} diff --git a/examples/snail.frag b/examples/snail.frag new file mode 100644 index 0000000..491c53a --- /dev/null +++ b/examples/snail.frag @@ -0,0 +1,41 @@ +#version 330 + +out vec4 fragColor; + +uniform vec2 res; +uniform float time; + +const float sharpness = 300; + +mat2 rot(float a) { + return mat2( + cos(a), -sin(a), + sin(a), cos(a) + ); +} + +float circle(vec2 m, float r, vec2 p) { + vec2 diff = m - p; + float d = sqrt(dot(diff, diff)); + + return clamp((r - d)*sharpness, 0.0, 1.0); +} + +float circle_d(vec2 m, float r, vec2 p) { + return circle(m, r, p) - circle(m, r - 1/sharpness, p); +} + +void main(void) { + vec2 m = res/2; + float s = min(m.x, m.y); + vec2 p = (gl_FragCoord.xy - m) / s; + + float scene = 0; + + for (int i = 1; i <= 50; i++) { + float c = circle_d(vec2(0.5, 0) * rot(time/500/i), 0.1 + 0.005*i, p); + scene = abs(scene - c); + } + + fragColor = vec4(vec3(1, 1, 1) * scene, 1); +} diff --git a/examples/square-in-circle.frag b/examples/square-in-circle.frag new file mode 100644 index 0000000..ad6c615 --- /dev/null +++ b/examples/square-in-circle.frag @@ -0,0 +1,66 @@ +#version 330 + +out vec4 fragColor; + +uniform vec2 res; +uniform float time; + +const float sharpness = 300; + +const float PI = 3.14159265358979323846; + + +mat2 rot(float a) { + return mat2( + cos(a), -sin(a), + sin(a), cos(a) + ); +} + +float circle(vec2 m, float r, vec2 p) { + vec2 diff = m - p; + float d = sqrt(dot(diff, diff)); + + return clamp((r - d)*sharpness, 0.0, 1.0); +} + +float circle_d(vec2 m, float r, vec2 p) { + return circle(m, r, p) - circle(m, r - 1/sharpness, p); +} + +float square(vec2 m, float a, float r, vec2 p) { + vec2 diff = abs((m - p) * rot(r)); + float d = max(diff.x, diff.y); + + return clamp((a - d)*sharpness, 0.0, 1.0); +} + +void main(void) { + vec2 m = res/2; + float s = min(m.x, m.y); + vec2 p = (gl_FragCoord.xy - m) / s; + + float scene = 0; + + int n = 20; + float b = 1; + float alpha = 0; + for (int i = 0; i < n; i++) { + float c; + + c = circle_d(vec2(0, 0), b, p); + scene = abs(scene - c); + + float delta = mod(time/5000, PI/2); + alpha = mod(alpha + delta, PI/2); + b /= sqrt(2); + + c = square(vec2(0, 0), b, alpha, p); + scene = abs(scene - c); + + c = square(vec2(0, 0), b, -alpha, p); + scene = abs(scene - c); + } + + fragColor = vec4(vec3(1, 1, 1) * scene, 1); +} diff --git a/examples/square-in-square.frag b/examples/square-in-square.frag new file mode 100644 index 0000000..cc00388 --- /dev/null +++ b/examples/square-in-square.frag @@ -0,0 +1,74 @@ +#version 330 + +out vec4 fragColor; + +uniform vec2 res; +uniform float time; + +const float sharpness = 300; + +const float PI = 3.14159265358979323846; + + +mat2 rot(float a) { + return mat2( + cos(a), -sin(a), + sin(a), cos(a) + ); +} + +float circle(vec2 m, float r, vec2 p) { + vec2 diff = m - p; + float d = sqrt(dot(diff, diff)); + + return clamp((r - d)*sharpness, 0.0, 1.0); +} + +float circle_d(vec2 m, float r, vec2 p) { + return circle(m, r, p) - circle(m, r - 1/sharpness, p); +} + +float square(vec2 m, float a, float r, vec2 p) { + vec2 diff = abs((m - p) * rot(r)); + float d = max(diff.x, diff.y); + + return clamp((a - d)*sharpness, 0.0, 1.0); +} + +float square_d(vec2 m, float a, float r, vec2 p) { + return square(m, a, r, p) - square(m, a - 1/sharpness, r, p); +} + +void main(void) { + vec2 m = res/2; + float s = min(m.x, m.y); + vec2 p = (gl_FragCoord.xy - m) / s; + + float scene = 0; + + int n = 20; + float b = 1; + float alpha = 0; + for (int i = 0; i < n; i++) { + float delta = mod(time/5000, PI/2); + alpha = mod(alpha + delta, PI/2); + b /= (sin(delta) + cos(delta)); + + float c = square(vec2(0, 0), b, alpha, p); + scene = abs(scene - c); + } + + + b = 1; + alpha = 0; + for (int i = 0; i < n; i++) { + float delta = mod(-time/5000, PI/2); + alpha = mod(alpha + delta, PI/2); + b /= (sin(delta) + cos(delta)); + + float c = square(vec2(0, 0), b, alpha, p); + scene = abs(scene - c); + } + + fragColor = vec4(vec3(1, 1, 1) * scene, 1); +} diff --git a/examples/square-ring.frag b/examples/square-ring.frag new file mode 100644 index 0000000..1ef1c2c --- /dev/null +++ b/examples/square-ring.frag @@ -0,0 +1,41 @@ +#version 330 + +out vec4 fragColor; + +uniform vec2 res; +uniform float time; + +const float sharpness = 300; + +const float PI = 3.14159265358979323846; + + +mat2 rot(float a) { + return mat2( + cos(a), -sin(a), + sin(a), cos(a) + ); +} + +float square(vec2 m, float a, float r, vec2 p) { + vec2 diff = abs((m - p) * rot(r)); + float d = max(diff.x, diff.y); + + return clamp((a - d)*sharpness, 0.0, 1.0); +} + +void main(void) { + vec2 m = res/2; + float s = min(m.x, m.y); + vec2 p = (gl_FragCoord.xy - m) / s; + + float scene = 0; + + int n = 10; + for (int i = 1; i <= n; i++) { + float c = square(vec2(0, 0), 0.5, PI/2*i/n - time/500, p); + scene = abs(scene - c); + } + + fragColor = vec4(vec3(1, 1, 1) * scene, 1); +} diff --git a/examples/square-ring2.frag b/examples/square-ring2.frag new file mode 100644 index 0000000..e90b633 --- /dev/null +++ b/examples/square-ring2.frag @@ -0,0 +1,47 @@ +#version 330 + +out vec4 fragColor; + +uniform vec2 res; +uniform float time; + +const float sharpness = 300; + +const float PI = 3.14159265358979323846; + + +mat2 rot(float a) { + return mat2( + cos(a), -sin(a), + sin(a), cos(a) + ); +} + +float square(vec2 m, float a, float r, vec2 p) { + vec2 diff = abs((m - p) * rot(r)); + float d = max(diff.x, diff.y); + + return clamp((a - d)*sharpness, 0.0, 1.0); +} + +void main(void) { + vec2 m = res/2; + float s = min(m.x, m.y); + vec2 p = (gl_FragCoord.xy - m) / s; + + float scene = 0; + + int n = 5; + for (int i = 1; i <= n; i++) { + float c = square(vec2(0, 0), 0.5, PI/2*i/n - time/3000, p); + scene = abs(scene - c); + } + + n = 5; + for (int i = 1; i <= n; i++) { + float c = square(vec2(0, 0), 0.5, PI/2*i/n + time/3000, p); + scene = abs(scene - c); + } + + fragColor = vec4(vec3(1, 1, 1) * scene, 1); +} diff --git a/examples/squares.frag b/examples/squares.frag new file mode 100644 index 0000000..fd5dc94 --- /dev/null +++ b/examples/squares.frag @@ -0,0 +1,42 @@ +#version 330 + +out vec4 fragColor; + +uniform vec2 res; +uniform float time; + +const float sharpness = 500; + +mat2 rot(float a) { + return mat2( + cos(a), -sin(a), + sin(a), cos(a) + ); +} + +float square(vec2 m, float a, float r, vec2 p) { + vec2 diff = abs((m - p) * rot(r)); + float d = max(diff.x, diff.y); + + return clamp((a - d)*sharpness, 0.0, 1.0); +} + +void main(void) { + vec2 m = res/2; + float s = min(m.x, m.y); + vec2 p = (gl_FragCoord.xy - m) / s; + + float a = atan(p.x, p.y); + + float x = mod(p.x, 0.1); + float y = mod(p.y, 0.1); + + float scene = 0; + + for (int i = 1; i <= 50; i++) { + float c = square(vec2(0.5, 0) * rot(time/500/i), 0.1 + 0.005*i, time/500/i + time/(100*i), p); + scene = abs(scene - c); + } + + fragColor = vec4(vec3(1, 1, 1) * scene, 1); +} diff --git a/examples/supersnail.frag b/examples/supersnail.frag new file mode 100644 index 0000000..154652a --- /dev/null +++ b/examples/supersnail.frag @@ -0,0 +1,37 @@ +#version 330 + +out vec4 fragColor; + +uniform vec2 res; +uniform float time; + +const float sharpness = 300; + +mat2 rot(float a) { + return mat2( + cos(a), -sin(a), + sin(a), cos(a) + ); +} + +float circle(vec2 m, float r, vec2 p) { + vec2 diff = m - p; + float d = sqrt(dot(diff, diff)); + + return clamp((r - d)*sharpness, 0.0, 1.0); +} + +void main(void) { + vec2 m = res/2; + float s = min(m.x, m.y); + vec2 p = (gl_FragCoord.xy - m) / s; + + float scene = 0; + + for (int i = 1; i <= 100; i++) { + float c = circle(vec2(0.5, 0) * rot(time/200/i), 0.1 + 0.002*i, p); + scene = abs(scene - c); + } + + fragColor = vec4(vec3(1, 1, 1) * scene, 1); +} diff --git a/examples/torus.frag b/examples/torus.frag new file mode 100644 index 0000000..9758e1d --- /dev/null +++ b/examples/torus.frag @@ -0,0 +1,41 @@ +#version 330 + +out vec4 fragColor; + +uniform vec2 res; +uniform float time; + +const float sharpness = 300; + +const float PI = 3.14159265358979323846; + + +mat2 rot(float a) { + return mat2( + cos(a), -sin(a), + sin(a), cos(a) + ); +} + +float square(vec2 m, float a, float r, vec2 p) { + vec2 diff = abs((m - p) * rot(r)); + float d = max(diff.x, diff.y); + + return clamp((a - d)*sharpness, 0.0, 1.0); +} + +void main(void) { + vec2 m = res/2; + float s = min(m.x, m.y); + vec2 p = (gl_FragCoord.xy - m) / s; + + float scene = 0; + + int n = 48; + for (int i = 1; i <= n; i++) { + float c = square(vec2(0.5, 0) * rot(PI/2*(time/8000 + 4.0*i/n)) * vec2(1, 0.5), 0.1, PI/2*(24.0*i/n - time/800), p); + scene = abs(scene - c); + } + + fragColor = vec4(vec3(1, 1, 1) * scene, 1); +} -- cgit v1.2.3