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qcam: viewfinder_gl: Add shader to render packed YUV formats

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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>
This commit is contained in:
Laurent Pinchart
2020-09-13 01:04:20 +03:00
parent ae9e7fbf3a
commit dcc47ff715
4 changed files with 140 additions and 0 deletions
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src/qcam/viewfinder_gl.cpp
+56
View File
@@ -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;
};