olemd/tilt-shift-camera
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Revert "Revert orientation tracking on the camera image"

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This reverts commit 4f8661f648.
This commit is contained in:
Ole-Morten Duesund 2026-05-11 15:29:59 +02:00
commit c0bab85d63
7 changed files with 171 additions and 55 deletions
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30
app/src/main/java/no/naiv/tiltshift/effect/TiltShiftShader.kt
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@ -20,6 +20,15 @@ import kotlin.math.sin
*/
class TiltShiftShader(private val context: Context) {
private companion object {
val IDENTITY_MATRIX = floatArrayOf(
1f, 0f, 0f, 0f,
0f, 1f, 0f, 0f,
0f, 0f, 1f, 0f,
0f, 0f, 0f, 1f
)
}
// --- Passthrough program (camera → FBO) ---
private var passthroughProgramId: Int = 0
@ -29,6 +38,8 @@ class TiltShiftShader(private val context: Context) {
var passthroughTexCoordLoc: Int = 0
private set
private var passthroughTextureLoc: Int = 0
private var passthroughTexMatrixLoc: Int = 0
private var passthroughMirrorLoc: Int = 0
// --- Blur program (FBO → FBO/screen) ---
@ -39,6 +50,8 @@ class TiltShiftShader(private val context: Context) {
var blurTexCoordLoc: Int = 0
private set
private var blurTextureLoc: Int = 0
private var blurTexMatrixLoc: Int = 0
private var blurMirrorLoc: Int = 0
private var blurModeLoc: Int = 0
private var blurPositionXLoc: Int = 0
private var blurPositionYLoc: Int = 0
@ -68,6 +81,8 @@ class TiltShiftShader(private val context: Context) {
passthroughPositionLoc = GLES20.glGetAttribLocation(passthroughProgramId, "aPosition")
passthroughTexCoordLoc = GLES20.glGetAttribLocation(passthroughProgramId, "aTexCoord")
passthroughTextureLoc = GLES20.glGetUniformLocation(passthroughProgramId, "uTexture")
passthroughTexMatrixLoc = GLES20.glGetUniformLocation(passthroughProgramId, "uTexMatrix")
passthroughMirrorLoc = GLES20.glGetUniformLocation(passthroughProgramId, "uMirrorX")
// Blur program
val blurFragSource = loadShaderSource(R.raw.tiltshift_fragment)
@ -78,6 +93,8 @@ class TiltShiftShader(private val context: Context) {
blurPositionLoc = GLES20.glGetAttribLocation(blurProgramId, "aPosition")
blurTexCoordLoc = GLES20.glGetAttribLocation(blurProgramId, "aTexCoord")
blurTextureLoc = GLES20.glGetUniformLocation(blurProgramId, "uTexture")
blurTexMatrixLoc = GLES20.glGetUniformLocation(blurProgramId, "uTexMatrix")
blurMirrorLoc = GLES20.glGetUniformLocation(blurProgramId, "uMirrorX")
blurModeLoc = GLES20.glGetUniformLocation(blurProgramId, "uMode")
blurPositionXLoc = GLES20.glGetUniformLocation(blurProgramId, "uPositionX")
blurPositionYLoc = GLES20.glGetUniformLocation(blurProgramId, "uPositionY")
@ -96,12 +113,19 @@ class TiltShiftShader(private val context: Context) {
/**
* Activates the passthrough program and binds the camera texture.
*
* @param cameraTextureId The OES texture receiving camera frames.
* @param texMatrix 4x4 transform from SurfaceTexture.getTransformMatrix() —
* encodes sensor-to-display rotation and Y-flip.
* @param mirrorX true to horizontally mirror (front camera selfie view).
*/
fun usePassthrough(cameraTextureId: Int) {
fun usePassthrough(cameraTextureId: Int, texMatrix: FloatArray, mirrorX: Boolean) {
GLES20.glUseProgram(passthroughProgramId)
GLES20.glActiveTexture(GLES20.GL_TEXTURE0)
GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, cameraTextureId)
GLES20.glUniform1i(passthroughTextureLoc, 0)
GLES20.glUniformMatrix4fv(passthroughTexMatrixLoc, 1, false, texMatrix, 0)
GLES20.glUniform1f(passthroughMirrorLoc, if (mirrorX) 1f else 0f)
}
/**
@ -128,6 +152,10 @@ class TiltShiftShader(private val context: Context) {
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, fboTextureId)
GLES20.glUniform1i(blurTextureLoc, 0)
// FBO content is already in display orientation — pass identity matrix and no mirror.
GLES20.glUniformMatrix4fv(blurTexMatrixLoc, 1, false, IDENTITY_MATRIX, 0)
GLES20.glUniform1f(blurMirrorLoc, 0f)
GLES20.glUniform1i(blurModeLoc, if (params.mode == BlurMode.RADIAL) 1 else 0)
GLES20.glUniform1f(blurPositionXLoc, params.positionX)
GLES20.glUniform1f(blurPositionYLoc, params.positionY)