CODEWITHSUNDEEP
javaopenglopengl-4
WorldSEnder
WorldSEnder

Reputation: 5044

Java OpenGL 4.4: Store/Push, Pop the current program pipeline

I have a hook that allows me to render my own model. For this model I want to use a custom vertex shader. Now the problem is that the outer program still renders using the old shader/program methods (glUseProgram) and I want to keep my program compatible when they switch to the new 4.4 ProgramPipeline and at the same time provide the same functionality even if the user doesn't support OpenGL 4.x. Now I thought I could do the following:

//Start of hook
int currProgram = glGetInteger(GL_CURRENT_PROGRAM);
int currVertexShader;
int currPipeline;
if (supportsPipelines) {
    glUseProgramStages(pipelineName, EXTERNAL_SHADER_BITS, currProgram);
    glUseProgram(0);
    // How do I store the currently selected pipeline, if any?
    glBindProgramPipeline(currPipeline);
} else {
    if(currProgram == 0) {
        glUseProgram(programName);
    } else {
        // Fiddle with the shaders ?
    }
}
// Do some rendering
// How do I pop back into the original configuration?

Upvotes: 0

Views: 124

Answers (1)

trapezoid
trapezoid

Reputation: 101

To store the current pipeline:

GLint prevPipeline = 0;
glGetIntegerv(GL_PROGRAM_PIPELINE_BINDING, &previousPipeline);
// assorted error checking

And to restore it:

glBindProgramPipeline(prevPipeline);

Upvotes: 1

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