69 lines
2.0 KiB
C++
69 lines
2.0 KiB
C++
#include "mesh_view.h"
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#include <QOpenGLContext>
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MeshView::MeshView(const MyMesh &mesh, QOpenGLShaderProgram &program)
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: buffer(QOpenGLBuffer::VertexBuffer),
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mesh(mesh) {
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GLfloat *verts = new GLfloat[mesh.n_faces() * 3 * 6];
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size_t i = 0;
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for (const FaceHandle face : mesh.faces()) {
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for (const VertexHandle vec : mesh.fv_range(face)) {
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verts[6*i + 0] = mesh.point(vec)[0];
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verts[6*i + 1] = mesh.point(vec)[1];
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verts[6*i + 2] = mesh.point(vec)[2];
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verts[6*i + 3] = mesh.color.red();
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verts[6*i + 4] = mesh.color.green();
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verts[6*i + 5] = mesh.color.blue();
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i++;
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}
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}
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vao.create();
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{QOpenGLVertexArrayObject::Binder binder(&vao);
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buffer.create();
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buffer.bind();
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buffer.setUsagePattern(QOpenGLBuffer::StreamDraw);
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buffer.allocate(verts, nverts * 6 * sizeof (GLfloat));
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delete[] verts;
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program.setAttributeBuffer("pos", GL_FLOAT, 0, 3, 6 * sizeof (GLfloat));
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program.enableAttributeArray("pos");
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program.setAttributeBuffer("col", GL_FLOAT, 3 * sizeof (GLfloat), 3, 6 * sizeof (GLfloat));
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program.enableAttributeArray("col");
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}
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}
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MeshView::~MeshView() {
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vao.destroy();
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buffer.destroy();
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}
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void MeshView::paint(QOpenGLShaderProgram &program) {
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QOpenGLContext *ctx = QOpenGLContext::currentContext();
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QOpenGLExtraFunctions *glf = ctx->extraFunctions();
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void (*glPolygonMode)(GLenum, GLenum) = nullptr;
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glPolygonMode = (typeof glPolygonMode) ctx->getProcAddress("glPolygonMode");
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if (!glPolygonMode)
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qWarning("glPolygonMode not available");
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program.setUniformValue("model", mesh.transform);
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{QOpenGLVertexArrayObject::Binder binder(&vao);
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/* Mesh */
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glf->glEnable(GL_POLYGON_OFFSET_FILL);
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glf->glPolygonOffset(1.0, 2);
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glf->glDrawArrays(GL_TRIANGLES, 0, nverts);
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if (glPolygonMode) glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
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glf->glDisable(GL_POLYGON_OFFSET_FILL);
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/* Wireframe */
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program.setUniformValue("wireframe", 1);
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glf->glDrawArrays(GL_TRIANGLES, 0, nverts);
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if (glPolygonMode) glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
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glf->glLineWidth(3);
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program.setUniformValue("wireframe", 1);
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}
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}
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