QOpenGL RCC Errors

jacubus

Hello, i'm trying to link shaders and .png texture file but i'm getting RCC errors.
For shaders

RCC Parse Error: 'C:/Users/Jacob/source/repos/SMGG_2_0/resources/fshader.glsl' Line: 1 Column: 1 [Start tag expected.]

For .png

RCC Parse Error: 'C:/Users/Jacob/source/repos/SMGG_2_0/resources/cube.png' Line: 1 Column: 1 [Encountered incorrectly encoded content.]

CMake

# Resources:
set(shaders_resource_files
    "resources/fshader.glsl"
    "resources/vshader.glsl"
)

qt6_add_resources(SMGG_2_0 "shaders"
    PREFIX
        "Shaders"
    FILES
        ${shaders_resource_files}
)
set(textures_resource_files
    "resources/cube.png"
)

qt6_add_resources(SMGG_2_0 "textures"
    PREFIX
        "Textures"
    FILES
        ${textures_resource_files}
)
set(PROJECT_SOURCES
        ${shaders_resource_files}
        ${textures_resource_files}
)

Shader files

#ifdef GL_ES
// Set default precision to medium
precision mediump int;
precision mediump float;
#endif

uniform sampler2D texture;

varying vec2 v_texcoord;

//! [0]
void main()
{
    // Set fragment color from texture
    gl_FragColor = texture2D(texture, v_texcoord);
}
//! [0]

#ifdef GL_ES
// Set default precision to medium
precision mediump int;
precision mediump float;
#endif

uniform mat4 mvp_matrix;

attribute vec4 a_position;
attribute vec2 a_texcoord;

varying vec2 v_texcoord;

//! [0]
void main()
{
    // Calculate vertex position in screen space
    gl_Position = mvp_matrix * a_position;

    // Pass texture coordinate to fragment shader
    // Value will be automatically interpolated to fragments inside polygon faces
    v_texcoord = a_texcoord;
}
//! [0]

Christian Ehrlicher

@jacubus said in QOpenGL RCC Errors:

qt6_add_resources

When you use the target variant you have to create the target (in your case SMGG_2_0 ) before the qt6_add_resources() call.

jacubus

@Christian-Ehrlicher
When i moved it to be after .exe i'm getting that it can't be opened.

QOpenGLShader: Unable to open file "vshader.glsl"
QOpenGLShader: Unable to open file "fshader.glsl"
QOpenGLShaderProgram::uniformLocation(mvp_matrix): shader program is not linked
QOpenGLShaderProgram::uniformLocation(texture): shader program is not linked

Project tree looks like:

            | widget.h
            | widget.cpp
mainfolder -| resources -|
                         | fshader.glsl
                         | vshader.glsl
                         | cube.png

Christian Ehrlicher

@jacubus said in QOpenGL RCC Errors:

I'm getting that it can't be opened.

but it compiles so it was correct.

Now you should show us how you're loading them in your code.

jacubus

@Christian-Ehrlicher

    // Compile vertex shader
    if (!program.addShaderFromSourceFile(QOpenGLShader::Vertex, ":/vshader.glsl"))
        close();

    // Compile fragment shader
    if (!program.addShaderFromSourceFile(QOpenGLShader::Fragment, ":/fshader.glsl"))
        close();

Christian Ehrlicher

@jacubus said in QOpenGL RCC Errors:

":/vshader.glsl"

qt6_add_resources(SMGG_2_0 "shaders"
PREFIX
"Shaders"
FILES
${shaders_resource_files}
)

I mean - how do you expect that the filename is :/vshader.glsl when you add "Shaders" as prefix. Reading the documentation to find out what the arguments are doing seems to be really hard these days...

PREFIX specifies a path prefix under which all files of this resource are accessible from C++ code. This corresponds to the XML attribute prefix of the .qrc file format. If PREFIX is not given, the target property QT_RESOURCE_PREFIX is used.