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-rw-r--r--src/qcam/assets/shader/identity.vert4
-rw-r--r--src/qcam/viewfinder_gl.cpp54
-rw-r--r--src/qcam/viewfinder_gl.h1
3 files changed, 47 insertions, 12 deletions
diff --git a/src/qcam/assets/shader/identity.vert b/src/qcam/assets/shader/identity.vert
index 6d6f7551..12c41377 100644
--- a/src/qcam/assets/shader/identity.vert
+++ b/src/qcam/assets/shader/identity.vert
@@ -9,8 +9,10 @@ attribute vec4 vertexIn;
attribute vec2 textureIn;
varying vec2 textureOut;
+uniform float stride_factor;
+
void main(void)
{
gl_Position = vertexIn;
- textureOut = textureIn;
+ textureOut = vec2(textureIn.x * stride_factor, textureIn.y);
}
diff --git a/src/qcam/viewfinder_gl.cpp b/src/qcam/viewfinder_gl.cpp
index aeb1ea02..3ae8b03a 100644
--- a/src/qcam/viewfinder_gl.cpp
+++ b/src/qcam/viewfinder_gl.cpp
@@ -395,6 +395,7 @@ bool ViewFinderGL::createFragmentShader()
textureUniformV_ = shaderProgram_.uniformLocation("tex_v");
textureUniformStep_ = shaderProgram_.uniformLocation("tex_step");
textureUniformSize_ = shaderProgram_.uniformLocation("tex_size");
+ textureUniformStrideFactor_ = shaderProgram_.uniformLocation("stride_factor");
textureUniformBayerFirstRed_ = shaderProgram_.uniformLocation("tex_bayer_first_red");
/* Create the textures. */
@@ -464,6 +465,9 @@ void ViewFinderGL::initializeGL()
void ViewFinderGL::doRender()
{
+ /* Stride of the first plane, in pixels. */
+ unsigned int stridePixels;
+
switch (format_) {
case libcamera::formats::NV12:
case libcamera::formats::NV21:
@@ -477,7 +481,7 @@ void ViewFinderGL::doRender()
glTexImage2D(GL_TEXTURE_2D,
0,
GL_LUMINANCE,
- size_.width(),
+ stride_,
size_.height(),
0,
GL_LUMINANCE,
@@ -491,13 +495,15 @@ void ViewFinderGL::doRender()
glTexImage2D(GL_TEXTURE_2D,
0,
GL_LUMINANCE_ALPHA,
- size_.width() / horzSubSample_,
+ stride_ / horzSubSample_,
size_.height() / vertSubSample_,
0,
GL_LUMINANCE_ALPHA,
GL_UNSIGNED_BYTE,
image_->data(1).data());
shaderProgram_.setUniformValue(textureUniformU_, 1);
+
+ stridePixels = stride_;
break;
case libcamera::formats::YUV420:
@@ -507,7 +513,7 @@ void ViewFinderGL::doRender()
glTexImage2D(GL_TEXTURE_2D,
0,
GL_LUMINANCE,
- size_.width(),
+ stride_,
size_.height(),
0,
GL_LUMINANCE,
@@ -521,7 +527,7 @@ void ViewFinderGL::doRender()
glTexImage2D(GL_TEXTURE_2D,
0,
GL_LUMINANCE,
- size_.width() / horzSubSample_,
+ stride_ / horzSubSample_,
size_.height() / vertSubSample_,
0,
GL_LUMINANCE,
@@ -535,13 +541,15 @@ void ViewFinderGL::doRender()
glTexImage2D(GL_TEXTURE_2D,
0,
GL_LUMINANCE,
- size_.width() / horzSubSample_,
+ stride_ / horzSubSample_,
size_.height() / vertSubSample_,
0,
GL_LUMINANCE,
GL_UNSIGNED_BYTE,
image_->data(2).data());
shaderProgram_.setUniformValue(textureUniformV_, 2);
+
+ stridePixels = stride_;
break;
case libcamera::formats::YVU420:
@@ -551,7 +559,7 @@ void ViewFinderGL::doRender()
glTexImage2D(GL_TEXTURE_2D,
0,
GL_LUMINANCE,
- size_.width(),
+ stride_,
size_.height(),
0,
GL_LUMINANCE,
@@ -565,7 +573,7 @@ void ViewFinderGL::doRender()
glTexImage2D(GL_TEXTURE_2D,
0,
GL_LUMINANCE,
- size_.width() / horzSubSample_,
+ stride_ / horzSubSample_,
size_.height() / vertSubSample_,
0,
GL_LUMINANCE,
@@ -579,13 +587,15 @@ void ViewFinderGL::doRender()
glTexImage2D(GL_TEXTURE_2D,
0,
GL_LUMINANCE,
- size_.width() / horzSubSample_,
+ stride_ / horzSubSample_,
size_.height() / vertSubSample_,
0,
GL_LUMINANCE,
GL_UNSIGNED_BYTE,
image_->data(2).data());
shaderProgram_.setUniformValue(textureUniformU_, 1);
+
+ stridePixels = stride_;
break;
case libcamera::formats::UYVY:
@@ -602,7 +612,7 @@ void ViewFinderGL::doRender()
glTexImage2D(GL_TEXTURE_2D,
0,
GL_RGBA,
- size_.width() / 2,
+ stride_ / 4,
size_.height(),
0,
GL_RGBA,
@@ -619,6 +629,8 @@ void ViewFinderGL::doRender()
shaderProgram_.setUniformValue(textureUniformStep_,
1.0f / (size_.width() / 2 - 1),
1.0f /* not used */);
+
+ stridePixels = stride_ / 2;
break;
case libcamera::formats::ABGR8888:
@@ -630,13 +642,15 @@ void ViewFinderGL::doRender()
glTexImage2D(GL_TEXTURE_2D,
0,
GL_RGBA,
- size_.width(),
+ stride_ / 4,
size_.height(),
0,
GL_RGBA,
GL_UNSIGNED_BYTE,
image_->data(0).data());
shaderProgram_.setUniformValue(textureUniformY_, 0);
+
+ stridePixels = stride_ / 4;
break;
case libcamera::formats::BGR888:
@@ -646,13 +660,15 @@ void ViewFinderGL::doRender()
glTexImage2D(GL_TEXTURE_2D,
0,
GL_RGB,
- size_.width(),
+ stride_ / 3,
size_.height(),
0,
GL_RGB,
GL_UNSIGNED_BYTE,
image_->data(0).data());
shaderProgram_.setUniformValue(textureUniformY_, 0);
+
+ stridePixels = stride_ / 3;
break;
case libcamera::formats::SBGGR8:
@@ -692,11 +708,27 @@ void ViewFinderGL::doRender()
shaderProgram_.setUniformValue(textureUniformStep_,
1.0f / (stride_ - 1),
1.0f / (size_.height() - 1));
+
+ /*
+ * The stride is already taken into account in the shaders, set
+ * the generic stride factor to 1.0.
+ */
+ stridePixels = size_.width();
break;
default:
+ stridePixels = size_.width();
break;
};
+
+ /*
+ * Compute the stride factor for the vertex shader, to map the
+ * horizontal texture coordinate range [0.0, 1.0] to the active portion
+ * of the image.
+ */
+ shaderProgram_.setUniformValue(textureUniformStrideFactor_,
+ static_cast<float>(size_.width() - 1) /
+ (stridePixels - 1));
}
void ViewFinderGL::paintGL()
diff --git a/src/qcam/viewfinder_gl.h b/src/qcam/viewfinder_gl.h
index 2b2b1e86..37b1ddd0 100644
--- a/src/qcam/viewfinder_gl.h
+++ b/src/qcam/viewfinder_gl.h
@@ -97,6 +97,7 @@ private:
/* Raw Bayer texture parameters */
GLuint textureUniformSize_;
+ GLuint textureUniformStrideFactor_;
GLuint textureUniformBayerFirstRed_;
QPointF firstRed_;
generated by cgit v1.2.1 (git 2.18.0) at 2024-11-02 20:45:44 +0000