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-rw-r--r--src/OffscreenView.cc284
1 files changed, 284 insertions, 0 deletions
diff --git a/src/OffscreenView.cc b/src/OffscreenView.cc
new file mode 100644
index 0000000..aa8570e
--- /dev/null
+++ b/src/OffscreenView.cc
@@ -0,0 +1,284 @@
+#include <GL/glew.h>
+#include "OffscreenView.h"
+#include "system-gl.h"
+#include <math.h>
+#include <stdio.h>
+#include <string.h>
+#include <cstdlib>
+#include <sstream>
+
+#ifdef _WIN32
+#include <GL/wglew.h>
+#elif !defined(__APPLE__)
+#include <GL/glxew.h>
+#endif
+
+
+OffscreenView::OffscreenView(size_t width, size_t height)
+{
+ object_rot << 35, 0, 25;
+ this->ctx = create_offscreen_context(width, height);
+ if ( this->ctx == NULL ) throw -1;
+ initializeGL();
+ GLView::resizeGL(width, height);
+}
+
+OffscreenView::~OffscreenView()
+{
+ teardown_offscreen_context(this->ctx);
+}
+
+void OffscreenView::enable_opencsg_shaders()
+{
+#ifdef ENABLE_OPENCSG
+ const char *openscad_disable_gl20_env = getenv("OPENSCAD_DISABLE_GL20");
+ if (openscad_disable_gl20_env && !strcmp(openscad_disable_gl20_env, "0")) {
+ openscad_disable_gl20_env = NULL;
+ }
+
+ // All OpenGL 2 contexts are OpenCSG capable
+ if (GLEW_VERSION_2_0) {
+ if (!openscad_disable_gl20_env) {
+ this->is_opencsg_capable = true;
+ this->has_shaders = true;
+ }
+ }
+
+ // If OpenGL < 2, check for extensions
+ else {
+ if (GLEW_ARB_framebuffer_object) this->is_opencsg_capable = true;
+ else if (GLEW_EXT_framebuffer_object && GLEW_EXT_packed_depth_stencil) {
+ this->is_opencsg_capable = true;
+ }
+#ifdef WIN32
+ else if (WGLEW_ARB_pbuffer && WGLEW_ARB_pixel_format) this->is_opencsg_capable = true;
+#elif !defined(__APPLE__)
+ else if (GLXEW_SGIX_pbuffer && GLXEW_SGIX_fbconfig) this->is_opencsg_capable = true;
+#endif
+ }
+
+ if (!GLEW_VERSION_2_0 || !this->is_opencsg_capable) {
+ fprintf(stderr, "OpenSCAD recommended OpenGL version is 2.0. \n");
+ }
+
+ if (opencsg_support && this->has_shaders) {
+ /*
+ Uniforms:
+ 1 color1 - face color
+ 2 color2 - edge color
+ 7 xscale
+ 8 yscale
+
+ Attributes:
+ 3 trig
+ 4 pos_b
+ 5 pos_c
+ 6 mask
+
+ Other:
+ 9 width
+ 10 height
+
+ Outputs:
+ tp
+ tr
+ shading
+ */
+ const char *vs_source =
+ "uniform float xscale, yscale;\n"
+ "attribute vec3 pos_b, pos_c;\n"
+ "attribute vec3 trig, mask;\n"
+ "varying vec3 tp, tr;\n"
+ "varying float shading;\n"
+ "void main() {\n"
+ " vec4 p0 = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
+ " vec4 p1 = gl_ModelViewProjectionMatrix * vec4(pos_b, 1.0);\n"
+ " vec4 p2 = gl_ModelViewProjectionMatrix * vec4(pos_c, 1.0);\n"
+ " 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"
+ " 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"
+ " 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"
+ " float s = (a + b + c) / 2.0;\n"
+ " float A = sqrt(s*(s-a)*(s-b)*(s-c));\n"
+ " float ha = 2.0*A/a;\n"
+ " gl_Position = p0;\n"
+ " tp = mask * ha;\n"
+ " tr = trig;\n"
+ " vec3 normal, lightDir;\n"
+ " normal = normalize(gl_NormalMatrix * gl_Normal);\n"
+ " lightDir = normalize(vec3(gl_LightSource[0].position));\n"
+ " shading = abs(dot(normal, lightDir));\n"
+ "}\n";
+
+ /*
+ Inputs:
+ tp && tr - if any components of tp < tr, use color2 (edge color)
+ shading - multiplied by color1. color2 is is without lighting
+ */
+ const char *fs_source =
+ "uniform vec4 color1, color2;\n"
+ "varying vec3 tp, tr, tmp;\n"
+ "varying float shading;\n"
+ "void main() {\n"
+ " gl_FragColor = vec4(color1.r * shading, color1.g * shading, color1.b * shading, color1.a);\n"
+ " if (tp.x < tr.x || tp.y < tr.y || tp.z < tr.z)\n"
+ " gl_FragColor = color2;\n"
+ "}\n";
+
+ GLuint vs = glCreateShader(GL_VERTEX_SHADER);
+ glShaderSource(vs, 1, (const GLchar**)&vs_source, NULL);
+ glCompileShader(vs);
+
+ GLuint fs = glCreateShader(GL_FRAGMENT_SHADER);
+ glShaderSource(fs, 1, (const GLchar**)&fs_source, NULL);
+ glCompileShader(fs);
+
+ GLuint edgeshader_prog = glCreateProgram();
+ glAttachShader(edgeshader_prog, vs);
+ glAttachShader(edgeshader_prog, fs);
+ glLinkProgram(edgeshader_prog);
+
+ shaderinfo[0] = edgeshader_prog;
+ shaderinfo[1] = glGetUniformLocation(edgeshader_prog, "color1");
+ shaderinfo[2] = glGetUniformLocation(edgeshader_prog, "color2");
+ shaderinfo[3] = glGetAttribLocation(edgeshader_prog, "trig");
+ shaderinfo[4] = glGetAttribLocation(edgeshader_prog, "pos_b");
+ shaderinfo[5] = glGetAttribLocation(edgeshader_prog, "pos_c");
+ shaderinfo[6] = glGetAttribLocation(edgeshader_prog, "mask");
+ shaderinfo[7] = glGetUniformLocation(edgeshader_prog, "xscale");
+ shaderinfo[8] = glGetUniformLocation(edgeshader_prog, "yscale");
+
+ GLenum err = glGetError();
+ if (err != GL_NO_ERROR) {
+ fprintf(stderr, "OpenGL Error: %s\n", gluErrorString(err));
+ }
+
+ GLint status;
+ glGetProgramiv(edgeshader_prog, GL_LINK_STATUS, &status);
+ if (status == GL_FALSE) {
+ int loglen;
+ char logbuffer[1000];
+ glGetProgramInfoLog(edgeshader_prog, sizeof(logbuffer), &loglen, logbuffer);
+ fprintf(stderr, "OpenGL Program Linker Error:\n%.*s", loglen, logbuffer);
+ } else {
+ int loglen;
+ char logbuffer[1000];
+ glGetProgramInfoLog(edgeshader_prog, sizeof(logbuffer), &loglen, logbuffer);
+ if (loglen > 0) {
+ fprintf(stderr, "OpenGL Program Link OK:\n%.*s", loglen, logbuffer);
+ }
+ glValidateProgram(edgeshader_prog);
+ glGetProgramInfoLog(edgeshader_prog, sizeof(logbuffer), &loglen, logbuffer);
+ if (loglen > 0) {
+ fprintf(stderr, "OpenGL Program Validation results:\n%.*s", loglen, logbuffer);
+ }
+ }
+ }
+#endif
+}
+
+void OffscreenView::initializeGL()
+{
+ glEnable(GL_DEPTH_TEST);
+ glDepthRange(-FAR_FAR_AWAY, +FAR_FAR_AWAY);
+
+ glEnable(GL_BLEND);
+ glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+ GLfloat light_diffuse[] = {1.0, 1.0, 1.0, 1.0};
+ GLfloat light_position0[] = {-1.0, -1.0, +1.0, 0.0};
+ GLfloat light_position1[] = {+1.0, +1.0, -1.0, 0.0};
+
+ glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
+ glLightfv(GL_LIGHT0, GL_POSITION, light_position0);
+ glEnable(GL_LIGHT0);
+ glLightfv(GL_LIGHT1, GL_DIFFUSE, light_diffuse);
+ glLightfv(GL_LIGHT1, GL_POSITION, light_position1);
+ glEnable(GL_LIGHT1);
+ glEnable(GL_LIGHTING);
+ glEnable(GL_NORMALIZE);
+
+ glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
+ glEnable(GL_COLOR_MATERIAL);
+
+
+}
+
+void OffscreenView::paintGL()
+{
+ glEnable(GL_LIGHTING);
+
+ if (orthomode) setupOrtho();
+ else setupPerspective();
+
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+
+ glClearColor(1.0f, 1.0f, 0.92f, 1.0f);
+
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+ gluLookAt(this->camera_eye[0], this->camera_eye[1], this->camera_eye[2],
+ this->camera_center[0], this->camera_center[1], this->camera_center[2],
+ 0.0, 0.0, 1.0);
+
+ // glRotated(object_rot[0], 1.0, 0.0, 0.0);
+ // glRotated(object_rot[1], 0.0, 1.0, 0.0);
+ // glRotated(object_rot[2], 0.0, 0.0, 1.0);
+
+ // Large gray axis cross inline with the model
+ // FIXME: This is always gray - adjust color to keep contrast with background
+ if (showaxes)
+ {
+ glLineWidth(1);
+ glColor3d(0.5, 0.5, 0.5);
+ glBegin(GL_LINES);
+ double l = 3*(this->camera_center - this->camera_eye).norm();
+ glVertex3d(-l, 0, 0);
+ glVertex3d(+l, 0, 0);
+ glVertex3d(0, -l, 0);
+ glVertex3d(0, +l, 0);
+ glVertex3d(0, 0, -l);
+ glVertex3d(0, 0, +l);
+ glEnd();
+ }
+
+ glDepthFunc(GL_LESS);
+ glCullFace(GL_BACK);
+ glDisable(GL_CULL_FACE);
+
+ glLineWidth(2);
+ glColor3d(1.0, 0.0, 0.0);
+
+ if (this->renderer) {
+ this->renderer->draw(showfaces, showedges);
+ }
+}
+
+bool OffscreenView::save(const char *filename)
+{
+ return save_framebuffer(this->ctx, filename);
+}
+
+bool OffscreenView::save(std::ostream &output)
+{
+ return save_framebuffer(this->ctx, output);
+}
+
+std::string OffscreenView::getRendererInfo() const
+{
+ std::stringstream out;
+
+ out << glew_dump()
+ << offscreen_context_getinfo(this->ctx);
+
+ return out.str();
+}
+
+/*
+void OffscreenView::setCamera(const Eigen::Vector3d &pos, const Eigen::Vector3d &center)
+{
+ this->camera_eye = pos;
+ this->camera_center = center;
+}
+
+*/
contact: Jan Huwald // Impressum