olemd/tilt-shift-camera
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Fix front camera rotation mirroring in shader

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Add uIsFrontCamera uniform to shader and adjust coordinate
transformations for front camera's mirrored texture coordinates:
- Position transform: (1-posY, 1-posX) instead of (posY, 1-posX)
- Angle transform: -angle - 90° instead of +angle + 90°

Applied to linearFocusDistance, radialFocusDistance, and blur
direction calculations in sampleBlurred.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Ole-Morten Duesund 2026-01-29 17:07:44 +01:00
commit 0cd41e9814
3 changed files with 51 additions and 17 deletions
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2
app/src/main/java/no/naiv/tiltshift/effect/TiltShiftRenderer.kt
View file

@ -126,7 +126,7 @@ class TiltShiftRenderer(
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT)
// Use shader and set parameters
shader.use(cameraTextureId, blurParameters, surfaceWidth, surfaceHeight)
shader.use(cameraTextureId, blurParameters, surfaceWidth, surfaceHeight, isFrontCamera)
// Set vertex positions
GLES20.glEnableVertexAttribArray(shader.aPositionLocation)

5
app/src/main/java/no/naiv/tiltshift/effect/TiltShiftShader.kt
View file

@ -24,6 +24,7 @@ class TiltShiftShader(private val context: Context) {
// Uniform locations
private var uTextureLocation: Int = 0
private var uModeLocation: Int = 0
private var uIsFrontCameraLocation: Int = 0
private var uAngleLocation: Int = 0
private var uPositionXLocation: Int = 0
private var uPositionYLocation: Int = 0
@ -65,6 +66,7 @@ class TiltShiftShader(private val context: Context) {
// Get uniform locations
uTextureLocation = GLES20.glGetUniformLocation(programId, "uTexture")
uModeLocation = GLES20.glGetUniformLocation(programId, "uMode")
uIsFrontCameraLocation = GLES20.glGetUniformLocation(programId, "uIsFrontCamera")
uAngleLocation = GLES20.glGetUniformLocation(programId, "uAngle")
uPositionXLocation = GLES20.glGetUniformLocation(programId, "uPositionX")
uPositionYLocation = GLES20.glGetUniformLocation(programId, "uPositionY")
@ -82,7 +84,7 @@ class TiltShiftShader(private val context: Context) {
/**
* Uses the shader program and sets uniforms.
*/
fun use(textureId: Int, params: BlurParameters, width: Int, height: Int) {
fun use(textureId: Int, params: BlurParameters, width: Int, height: Int, isFrontCamera: Boolean = false) {
GLES20.glUseProgram(programId)
// Bind camera texture
@ -92,6 +94,7 @@ class TiltShiftShader(private val context: Context) {
// Set effect parameters
GLES20.glUniform1i(uModeLocation, if (params.mode == BlurMode.RADIAL) 1 else 0)
GLES20.glUniform1i(uIsFrontCameraLocation, if (isFrontCamera) 1 else 0)
GLES20.glUniform1f(uAngleLocation, params.angle)
GLES20.glUniform1f(uPositionXLocation, params.positionX)
GLES20.glUniform1f(uPositionYLocation, params.positionY)