summaryrefslogtreecommitdiff
path: root/src/qcam/viewfinder_gl.cpp
diff options
context:
space:
mode:
authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2020-09-13 01:04:20 +0300
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2020-10-04 22:51:45 +0300
commitdcc47ff715ef1a8b97df53c810ec0c4b069b06e5 (patch)
treedcfb3fc39fa69ec4c04bfa68550834dee075770f /src/qcam/viewfinder_gl.cpp
parentae9e7fbf3a8bf45b08951b650aec3f91997fafc3 (diff)
qcam: viewfinder_gl: Add shader to render packed YUV formats
The shader supports all 4 packed 8-bit YUV variants. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Diffstat (limited to 'src/qcam/viewfinder_gl.cpp')
-rw-r--r--src/qcam/viewfinder_gl.cpp56
1 files changed, 56 insertions, 0 deletions
diff --git a/src/qcam/viewfinder_gl.cpp b/src/qcam/viewfinder_gl.cpp
index b8a48272..0b5c9426 100644
--- a/src/qcam/viewfinder_gl.cpp
+++ b/src/qcam/viewfinder_gl.cpp
@@ -14,12 +14,19 @@
#include <libcamera/formats.h>
static const QList<libcamera::PixelFormat> supportedFormats{
+ /* Packed (single plane) */
+ libcamera::formats::UYVY,
+ libcamera::formats::VYUY,
+ libcamera::formats::YUYV,
+ libcamera::formats::YVYU,
+ /* Semi planar (two planes) */
libcamera::formats::NV12,
libcamera::formats::NV21,
libcamera::formats::NV16,
libcamera::formats::NV61,
libcamera::formats::NV24,
libcamera::formats::NV42,
+ /* Fully planar (three planes) */
libcamera::formats::YUV420,
libcamera::formats::YVU420,
};
@@ -149,6 +156,22 @@ bool ViewFinderGL::selectFormat(const libcamera::PixelFormat &format)
vertSubSample_ = 2;
fragmentShaderFile_ = ":YUV_3_planes.frag";
break;
+ case libcamera::formats::UYVY:
+ fragmentShaderDefines_.append("#define YUV_PATTERN_UYVY");
+ fragmentShaderFile_ = ":YUV_packed.frag";
+ break;
+ case libcamera::formats::VYUY:
+ fragmentShaderDefines_.append("#define YUV_PATTERN_VYUY");
+ fragmentShaderFile_ = ":YUV_packed.frag";
+ break;
+ case libcamera::formats::YUYV:
+ fragmentShaderDefines_.append("#define YUV_PATTERN_YUYV");
+ fragmentShaderFile_ = ":YUV_packed.frag";
+ break;
+ case libcamera::formats::YVYU:
+ fragmentShaderDefines_.append("#define YUV_PATTERN_YVYU");
+ fragmentShaderFile_ = ":YUV_packed.frag";
+ break;
default:
ret = false;
qWarning() << "[ViewFinderGL]:"
@@ -235,6 +258,7 @@ bool ViewFinderGL::createFragmentShader()
textureUniformY_ = shaderProgram_.uniformLocation("tex_y");
textureUniformU_ = shaderProgram_.uniformLocation("tex_u");
textureUniformV_ = shaderProgram_.uniformLocation("tex_v");
+ textureUniformStepX_ = shaderProgram_.uniformLocation("tex_stepx");
if (!textureY_.isCreated())
textureY_.create();
@@ -431,6 +455,38 @@ void ViewFinderGL::doRender()
shaderProgram_.setUniformValue(textureUniformU_, 1);
break;
+ case libcamera::formats::UYVY:
+ case libcamera::formats::VYUY:
+ case libcamera::formats::YUYV:
+ case libcamera::formats::YVYU:
+ /*
+ * Packed YUV formats are stored in a RGBA texture to match the
+ * OpenGL texel size with the 4 bytes repeating pattern in YUV.
+ * The texture width is thus half of the image with.
+ */
+ glActiveTexture(GL_TEXTURE0);
+ configureTexture(textureY_);
+ glTexImage2D(GL_TEXTURE_2D,
+ 0,
+ GL_RGBA,
+ size_.width() / 2,
+ size_.height(),
+ 0,
+ GL_RGBA,
+ GL_UNSIGNED_BYTE,
+ yuvData_);
+ shaderProgram_.setUniformValue(textureUniformY_, 0);
+
+ /*
+ * The shader needs the step between two texture pixels in the
+ * horizontal direction, expressed in texture coordinate units
+ * ([0, 1]). There are exactly width - 1 steps between the
+ * leftmost and rightmost texels.
+ */
+ shaderProgram_.setUniformValue(textureUniformStepX_,
+ 1.0f / (size_.width() / 2 - 1));
+ break;
+
default:
break;
};