66 lines
1.6 KiB
C++
66 lines
1.6 KiB
C++
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#include "fish_painter.h"
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#include <QtMath>
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const GLfloat vertices[] = {
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1, 0, 0,
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-1, .5, 0,
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-1, -.5, 0,
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};
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void FishPainter::create(QOpenGLExtraFunctions *glf) {
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(void) glf;
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if (!program.addShaderFromSourceFile(QOpenGLShader::Vertex,
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":/shaders/fish.vert")) {
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qCritical() << program.log();
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}
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if (!program.addShaderFromSourceFile(QOpenGLShader::Fragment,
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":/shaders/fish.frag")) {
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qCritical() << program.log();
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}
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if (!program.link()) {
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qCritical() << program.log();
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}
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vao.create();
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{QOpenGLVertexArrayObject::Binder bind(&vao);
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vbo.create();
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vbo.bind();
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vbo.allocate(vertices, 9 * sizeof (GLfloat));
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program.bind();
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program.setAttributeBuffer("position", GL_FLOAT, 0, 3);
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program.enableAttributeArray("position");
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}
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}
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void FishPainter::paint(QOpenGLExtraFunctions *glf,
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const QMatrix4x4 &projection,
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const QMatrix4x4 &view,
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const std::vector<Fish> fishes) {
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const QVector3D X(1, 0, 0);
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{QOpenGLVertexArrayObject::Binder bind(&vao);
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program.setUniformValue("projection", projection);
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program.setUniformValue("view", view);
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QMatrix4x4 model;
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for (const Fish &fish : fishes) {
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model.setToIdentity();
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model.translate(fish.position);
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if (!fish.velocity.isNull()) {
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double dot = QVector3D::dotProduct(X, fish.velocity);
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double angle = qAcos(dot / fish.velocity.length());
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if (angle != 0) {
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model.rotate(qRadiansToDegrees(angle),
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QVector3D::crossProduct(X, fish.velocity));
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}
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}
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program.setUniformValue("model", model);
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glf->glDrawArrays(GL_TRIANGLES, 0, 3);
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}
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}
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}
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