mirror of https://github.com/vitalif/openscad
248 lines
7.2 KiB
C++
248 lines
7.2 KiB
C++
/*
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* OpenSCAD (www.openscad.at)
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* Copyright (C) 2009 Clifford Wolf <clifford@clifford.at>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "openscad.h"
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#include <QWheelEvent>
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#include <QMouseEvent>
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#define FAR_FAR_AWAY 100000.0
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GLView::GLView(QWidget *parent) : QGLWidget(parent)
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{
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viewer_distance = 500;
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object_rot_y = 35;
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object_rot_z = 25;
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mouse_drag_active = false;
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last_mouse_x = 0;
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last_mouse_y = 0;
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renderfunc = NULL;
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renderfunc_vp = NULL;
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for (int i = 0; i < 10; i++)
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shaderinfo[i] = 0;
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setMouseTracking(true);
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}
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extern GLint e1, e2, e3;
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void GLView::initializeGL()
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{
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glEnable(GL_DEPTH_TEST);
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glDepthRange(-FAR_FAR_AWAY, +FAR_FAR_AWAY);
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glEnable(GL_BLEND);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glClearColor(1.0, 1.0, 0.9, 0.0);
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#ifdef ENABLE_OPENCSG
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GLenum err = glewInit();
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if (GLEW_OK != err) {
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fprintf(stderr, "GLEW Error: %s\n", glewGetErrorString(err));
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}
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if (glewIsSupported("GL_VERSION_2_0"))
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{
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const char *vs_source =
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"uniform float xscale, yscale;\n"
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"attribute vec3 pos_b, pos_c;\n"
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"attribute vec3 trig, mask;\n"
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"varying vec3 tp, tr;\n"
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"varying float shading;\n"
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"void main() {\n"
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" vec4 p0 = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
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" vec4 p1 = gl_ModelViewProjectionMatrix * vec4(pos_b, 1.0);\n"
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" vec4 p2 = gl_ModelViewProjectionMatrix * vec4(pos_c, 1.0);\n"
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" float a = distance(vec2(xscale*p1.x/p1.w, yscale*p1.y/p1.w), vec2(xscale*p2.x/p2.w, yscale*p2.y/p2.w));\n"
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" float b = distance(vec2(xscale*p0.x/p0.w, yscale*p0.y/p0.w), vec2(xscale*p1.x/p1.w, yscale*p1.y/p1.w));\n"
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" float c = distance(vec2(xscale*p0.x/p0.w, yscale*p0.y/p0.w), vec2(xscale*p2.x/p2.w, yscale*p2.y/p2.w));\n"
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" float s = (a + b + c) / 2.0;\n"
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" float A = sqrt(s*(s-a)*(s-b)*(s-c));\n"
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" float ha = 2.0*A/a;\n"
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" gl_Position = p0;\n"
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" tp = mask * ha;\n"
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" tr = trig;\n"
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" vec3 normal, lightDir;\n"
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" normal = normalize(gl_NormalMatrix * gl_Normal);\n"
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" lightDir = normalize(vec3(gl_LightSource[0].position));\n"
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" shading = abs(dot(normal, lightDir));\n"
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"}\n";
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const char *fs_source =
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"uniform vec4 color1, color2;\n"
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"varying vec3 tp, tr, tmp;\n"
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"varying float shading;\n"
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"void main() {\n"
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" gl_FragColor = vec4(color1.r * shading, color1.g * shading, color1.b * shading, color1.a);\n"
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" if (tp.x < tr.x || tp.y < tr.y || tp.z < tr.z)\n"
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" gl_FragColor = color2;\n"
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"}\n";
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GLuint vs = glCreateShader(GL_VERTEX_SHADER);
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glShaderSource(vs, 1, (const GLchar**)&vs_source, NULL);
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glCompileShader(vs);
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GLuint fs = glCreateShader(GL_FRAGMENT_SHADER);
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glShaderSource(fs, 1, (const GLchar**)&fs_source, NULL);
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glCompileShader(fs);
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GLuint edgeshader_prog = glCreateProgram();
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glAttachShader(edgeshader_prog, vs);
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glAttachShader(edgeshader_prog, fs);
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glLinkProgram(edgeshader_prog);
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shaderinfo[0] = edgeshader_prog;
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shaderinfo[1] = glGetUniformLocation(edgeshader_prog, "color1");
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shaderinfo[2] = glGetUniformLocation(edgeshader_prog, "color2");
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shaderinfo[3] = glGetAttribLocation(edgeshader_prog, "trig");
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shaderinfo[4] = glGetAttribLocation(edgeshader_prog, "pos_b");
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shaderinfo[5] = glGetAttribLocation(edgeshader_prog, "pos_c");
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shaderinfo[6] = glGetAttribLocation(edgeshader_prog, "mask");
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shaderinfo[7] = glGetUniformLocation(edgeshader_prog, "xscale");
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shaderinfo[8] = glGetUniformLocation(edgeshader_prog, "yscale");
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GLenum err = glGetError();
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if (err != GL_NO_ERROR) {
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fprintf(stderr, "OpenGL Error: %s\n", gluErrorString(err));
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}
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GLint status;
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glGetProgramiv(edgeshader_prog, GL_LINK_STATUS, &status);
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if (status == GL_FALSE) {
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int loglen;
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char logbuffer[1000];
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glGetProgramInfoLog(edgeshader_prog, sizeof(logbuffer), &loglen, logbuffer);
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fprintf(stderr, "OpenGL Program Linker Error:\n%.*s", loglen, logbuffer);
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} else {
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int loglen;
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char logbuffer[1000];
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glGetProgramInfoLog(edgeshader_prog, sizeof(logbuffer), &loglen, logbuffer);
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if (loglen > 0) {
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fprintf(stderr, "OpenGL Program Link OK:\n%.*s", loglen, logbuffer);
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}
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glValidateProgram(edgeshader_prog);
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glGetProgramInfoLog(edgeshader_prog, sizeof(logbuffer), &loglen, logbuffer);
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if (loglen > 0) {
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fprintf(stderr, "OpenGL Program Validation results:\n%.*s", loglen, logbuffer);
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}
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}
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} else {
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fprintf(stdout, "GLEW: GL_VERSION_2_0 is not supported!\n");
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}
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#endif /* ENABLE_OPENCSG */
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}
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void GLView::resizeGL(int w, int h)
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{
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#ifdef ENABLE_OPENCSG
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shaderinfo[9] = w;
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shaderinfo[10] = h;
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#endif
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glViewport(0, 0, w, h);
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w_h_ratio = sqrt((double)w / (double)h);
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}
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void GLView::paintGL()
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{
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glFrustum(-w_h_ratio, +w_h_ratio, -(1/w_h_ratio), +(1/w_h_ratio), +10.0, +FAR_FAR_AWAY);
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gluLookAt(0.0, -viewer_distance, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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GLfloat light_diffuse[] = {1.0, 1.0, 1.0, 1.0};
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GLfloat light_position0[] = {-1.0, -1.0, +1.0, 0.0};
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GLfloat light_position1[] = {+1.0, +1.0, -1.0, 0.0};
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glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
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glLightfv(GL_LIGHT0, GL_POSITION, light_position0);
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glEnable(GL_LIGHT0);
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glLightfv(GL_LIGHT1, GL_DIFFUSE, light_diffuse);
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glLightfv(GL_LIGHT1, GL_POSITION, light_position1);
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glEnable(GL_LIGHT1);
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glEnable(GL_LIGHTING);
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glEnable(GL_NORMALIZE);
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glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
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glEnable(GL_COLOR_MATERIAL);
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glRotated(object_rot_y, 1.0, 0.0, 0.0);
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glRotated(object_rot_z, 0.0, 0.0, 1.0);
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glDepthFunc(GL_LESS);
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#if 0
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glLineWidth(1);
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glColor3d(0.0, 0.0, 1.0);
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glBegin(GL_LINES);
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glVertex3d(0, 0, 0); glVertex3d(10, 0, 0);
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glVertex3d(0, 0, 0); glVertex3d(0, 10, 0);
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glVertex3d(0, 0, 0); glVertex3d(0, 0, 10);
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glEnd();
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#endif
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glLineWidth(2);
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glColor3d(1.0, 0.0, 0.0);
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if (renderfunc)
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renderfunc(renderfunc_vp);
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}
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void GLView::wheelEvent(QWheelEvent *event)
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{
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viewer_distance *= pow(0.9, event->delta() / 120.0);
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updateGL();
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}
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void GLView::mousePressEvent(QMouseEvent *event)
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{
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mouse_drag_active = true;
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last_mouse_x = event->globalX();
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last_mouse_y = event->globalY();
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grabMouse();
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}
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void GLView::mouseMoveEvent(QMouseEvent *event)
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{
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int this_mouse_x = event->globalX();
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int this_mouse_y = event->globalY();
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if (mouse_drag_active) {
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object_rot_y += (this_mouse_y-last_mouse_y) * 0.7;
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object_rot_z += (this_mouse_x-last_mouse_x) * 0.7;
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updateGL();
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}
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last_mouse_x = this_mouse_x;
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last_mouse_y = this_mouse_y;
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}
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void GLView::mouseReleaseEvent(QMouseEvent*)
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{
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mouse_drag_active = false;
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releaseMouse();
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}
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