olemd/tilt-shift-camera
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Fix GLSL shader for OpenGL ES 2.0 compatibility

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- Move #extension directive to first line (required by GLSL)
- Replace array initializer syntax with getWeight() function
  (float[]() constructor not supported in GLSL ES 1.00)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Ole-Morten Duesund 2026-01-28 15:27:55 +01:00
commit cc367bc713
1 changed files with 19 additions and 15 deletions
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34
app/src/main/res/raw/tiltshift_fragment.glsl
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@ -1,8 +1,8 @@
#extension GL_OES_EGL_image_external : require
// Fragment shader for tilt-shift effect // Fragment shader for tilt-shift effect
// Applies gradient blur based on distance from focus line // Applies gradient blur based on distance from focus line
#extension GL_OES_EGL_image_external : require
precision mediump float; precision mediump float;
// Camera texture (external texture for camera preview) // Camera texture (external texture for camera preview)
@ -17,16 +17,6 @@ uniform vec2 uResolution; // Texture resolution for proper sampling
varying vec2 vTexCoord; varying vec2 vTexCoord;
// Blur kernel size (must be odd)
const int KERNEL_SIZE = 9;
const float KERNEL_HALF = 4.0;
// Gaussian weights for 9-tap blur (sigma ~= 2.0)
const float weights[9] = float[](
0.0162, 0.0540, 0.1216, 0.1933, 0.2258,
0.1933, 0.1216, 0.0540, 0.0162
);
// Calculate signed distance from the focus line // Calculate signed distance from the focus line
float focusDistance(vec2 uv) { float focusDistance(vec2 uv) {
// Rotate coordinate system around center // Rotate coordinate system around center
@ -57,6 +47,19 @@ float blurFactor(float dist) {
return smoothstep(0.0, 1.0, normalizedDist) * uBlurAmount; return smoothstep(0.0, 1.0, normalizedDist) * uBlurAmount;
} }
// Get Gaussian weight for blur kernel (9-tap, sigma ~= 2.0)
float getWeight(int i) {
if (i == 0) return 0.0162;
if (i == 1) return 0.0540;
if (i == 2) return 0.1216;
if (i == 3) return 0.1933;
if (i == 4) return 0.2258;
if (i == 5) return 0.1933;
if (i == 6) return 0.1216;
if (i == 7) return 0.0540;
return 0.0162; // i == 8
}
// Sample with Gaussian blur // Sample with Gaussian blur
vec4 sampleBlurred(vec2 uv, float blur) { vec4 sampleBlurred(vec2 uv, float blur) {
if (blur < 0.01) { if (blur < 0.01) {
@ -73,10 +76,11 @@ vec4 sampleBlurred(vec2 uv, float blur) {
// Scale blur radius by blur amount // Scale blur radius by blur amount
float radius = blur * 20.0; float radius = blur * 20.0;
for (int i = 0; i < KERNEL_SIZE; i++) { // 9-tap Gaussian blur
float offset = (float(i) - KERNEL_HALF); for (int i = 0; i < 9; i++) {
float offset = float(i) - 4.0;
vec2 samplePos = uv + blurDir * texelSize * offset * radius; vec2 samplePos = uv + blurDir * texelSize * offset * radius;
color += texture2D(uTexture, samplePos) * weights[i]; color += texture2D(uTexture, samplePos) * getWeight(i);
} }
return color; return color;