将 Qt 着色器从 Qt 5.15 更新到 Qt 6.2

Question

with the new Qt6.2 update, vertex and fragment shaders are required to be packaged in a.qsb file instead of embedded as strings in the ShaderEffect component.

I'm trying to change my vertexShader to use the new standard. Below is the code currently

vertexShader: "
                uniform highp mat4 qt_Matrix;
                attribute highp vec4 qt_Vertex;
                attribute highp vec2 qt_MultiTexCoord0;
                varying highp vec2 coord;
                void main() {
                    coord = qt_MultiTexCoord0;
                    gl_Position = qt_Matrix * qt_Vertex;
                } 
"

How can I go about creating the.qsb file and using it in the ShaderEffect?

Answer 1

there are some link about how to create, use qsb files

QSB Manual

ShaderEffect QML Type

Qt Shader Tools

Answer 2

In CMake, you can use qt6_add_shaders to bake shaders into qsb files. For example here is something I used in my project:

qt6_add_shaders(graph "graph-shaders"
  BATCHABLE
  PRECOMPILE
  OPTIMIZED
  PREFIX
  "/"
  FILES
  "shaders/cube/cube.frag"
  "shaders/cube/cube.vert"
  "shaders/line/line.frag"
  "shaders/line/line.vert"
  "shaders/noisy/noisy.frag"
  "shaders/noisy/noisy.vert"
  )

You can see that I have a folder where all of my shaders are located In there, and when I run CMake I receive the following information:

shaders/cube/cube.frag -> shaders/cube/cube.frag.qsb exposed as ://shaders/cube/cube.frag.qsb
shaders/cube/cube.vert -> shaders/cube/cube.vert.qsb exposed as ://shaders/cube/cube.vert.qsb
shaders/line/line.frag -> shaders/line/line.frag.qsb exposed as ://shaders/line/line.frag.qsb
shaders/line/line.vert -> shaders/line/line.vert.qsb exposed as ://shaders/line/line.vert.qsb
shaders/noisy/noisy.frag -> shaders/noisy/noisy.frag.qsb exposed as ://shaders/noisy/noisy.frag.qsb
shaders/noisy/noisy.vert -> shaders/noisy/noisy.vert.qsb exposed as ://shaders/noisy/noisy.vert.qsb

All of these compiled QSB files are located in the QT resource (which is included with the executable file). And Using it in QML or C++ is as simple as:

vertexShader: ":/shaders/noisy/noisy.vert.qsb"

It's so much cleaner now, as you can see:)