74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
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#include "mesh_view.h"
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#include <QOpenGLFunctions_2_1>
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MeshView::MeshView(QOpenGLExtraFunctions *glf, const MyMesh &mesh,
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int pos_attr, int col_attr)
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: glf(glf),
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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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delete[] verts;
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GLuint vao, vbo;
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glf->glGenVertexArrays(1, &vao);
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glf->glGenBuffers(1, &vbo);
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glf->glBindVertexArray(vao);
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glf->glBindBuffer(GL_ARRAY_BUFFER, vbo);
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glf->glBufferData(GL_ARRAY_BUFFER, nverts * 6 * sizeof (GLfloat), verts, GL_DYNAMIC_DRAW);
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glf->glVertexAttribPointer(pos_attr, 3, GL_FLOAT, GL_FALSE, 6 * sizeof (GLfloat), 0);
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glf->glEnableVertexAttribArray(pos_attr);
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glf->glVertexAttribPointer(col_attr, 3, GL_FLOAT, GL_FALSE, 6 * sizeof (GLfloat),
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(const void *) (3 * sizeof (GLfloat)));
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glf->glEnableVertexAttribArray(col_attr);
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glf->glBindVertexArray(0);
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}
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MeshView::~MeshView() {
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glf->glDeleteVertexArrays(1, &vao);
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glf->glDeleteBuffers(1, &vbo);
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}
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void MeshView::paint(QOpenGLContext *ctx,
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int model_attr, int wireframe_attr) const {
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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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glf->glUniformMatrix4fv(model_attr, 1, GL_FALSE,
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mesh.transform.constData());
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/* Mesh */
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glf->glBindVertexArray(vao);
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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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glf->glUniform1f(wireframe_attr, 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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glf->glUniform1f(wireframe_attr, 0);
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}
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