Add poly2tri and C++ wrapper for polygon tesselation.
This commit is contained in:
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commit
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@ -6,3 +6,6 @@
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path = 3rdparty/libfort
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url = https://git.shimatta.de/3rd-party/libfort
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branch = develop
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[submodule "3rdparty/poly2tri"]
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path = 3rdparty/poly2tri
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url = https://git.shimatta.de/3rd-party/poly2tri.git
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@ -0,0 +1 @@
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Subproject commit 3380f5c805dd25a06de21f7dacd4db529dbe07e7
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@ -2,7 +2,7 @@ if (POLICY CMP0048)
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cmake_policy(SET CMP0048 NEW)
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endif (POLICY CMP0048)
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project(gds-render LANGUAGES C)
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project(gds-render LANGUAGES C CXX)
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if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
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set(CMAKE_INSTALL_PREFIX "/usr/" CACHE PATH "..." FORCE)
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@ -75,8 +75,6 @@ SET_SOURCE_FILES_PROPERTIES(${SOURCE_GENERATED} PROPERTIES GENERATED 1)
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add_subdirectory(test)
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add_compile_options(-Wall -Wextra -Wold-style-declaration -Wuninitialized -Wmaybe-uninitialized -Wunused-parameter)
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add_subdirectory(resources)
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add_subdirectory(doxygen)
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add_subdirectory(translations)
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@ -91,6 +89,8 @@ if(OPENGL_PREVIEW)
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add_subdirectory(preview-rendering)
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endif(OPENGL_PREVIEW)
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add_compile_options(-Wall -Wextra -Wold-style-declaration -Wuninitialized -Wmaybe-uninitialized -Wunused-parameter)
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link_directories(${GLIB_LINK_DIRS} ${GTK3_LINK_DIRS} ${CAIRO_LINK_DIRS})
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add_definitions(${GLIB2_CFLAGS_OTHER})
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@ -8,8 +8,11 @@ pkg_check_modules(GTK3 REQUIRED gtk+-3.0)
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aux_source_directory("src" SRCS)
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add_subdirectory(poly2tri-wrapper)
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add_library(${PROJECT_NAME} STATIC ${SRCS})
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target_include_directories(${PROJECT_NAME} PUBLIC "include")
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target_include_directories(${PROJECT_NAME} PRIVATE ${EPOXY_INCLUDE_DIRS} ${GLIB_INCLUDE_DIRS} ${GTK3_INCLUDE_DIRS})
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target_link_directories(${PROJECT_NAME} PUBLIC ${EPOXY_LINK_DIRS} ${GLIB_LINK_DIRS} ${GTK3_LINK_DIRS})
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target_link_libraries(${PROJECT_NAME} ${GLIB_LDFLAGS} ${EPOXY_LDFLAGS} ${GTK3_LDFLAGS})
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target_link_libraries(${PROJECT_NAME} ${GLIB_LDFLAGS} ${EPOXY_LDFLAGS} ${GTK3_LDFLAGS} poly2tri-wrapper)
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@ -0,0 +1,11 @@
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project(poly2tri-wrapper LANGUAGES CXX)
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cmake_minimum_required(VERSION 3.12)
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add_subdirectory(../../3rdparty/poly2tri poly2tri)
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set(CMAKE_CXX_STANDARD 14)
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aux_source_directory("src" WRAPPER_SOURCES)
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add_library(${PROJECT_NAME} STATIC ${WRAPPER_SOURCES})
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target_link_libraries(${PROJECT_NAME} poly2tri)
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target_include_directories(${PROJECT_NAME} PUBLIC "include")
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@ -0,0 +1,16 @@
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#ifndef _POLY2TRI_WRAPPER_H_
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#define _POLY2TRI_WRAPPER_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <gds-render/gds-utils/gds-types.h>
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int tesselator_triangulate_polygon(const struct gds_graphics *gfx, double scale, float **output_vertices, size_t *vertex_count);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* _POLY2TRI_WRAPPER_H_ */
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@ -0,0 +1,58 @@
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#include <iostream>
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#include <poly2tri/poly2tri.h>
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#include <poly2tri-wrapper/poly2tri-wrapper.h>
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//#include <gds-render/gds-utils/gds-types.h>
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#include <vector>
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int tesselator_triangulate_polygon(const struct gds_graphics *gfx, double scale, float** output_vertices, size_t *vertex_count)
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{
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GList *vertex_iter;
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std::vector<p2t::Point*> polyline;
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if (gfx->gfx_type != GRAPHIC_POLYGON)
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return -1;
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for (vertex_iter = gfx->vertices; vertex_iter; vertex_iter = g_list_next(vertex_iter)) {
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struct gds_point *gds_pt = (struct gds_point *)vertex_iter->data;
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auto pt = new p2t::Point((double)gds_pt->x/scale, (double)gds_pt->y/scale);
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polyline.push_back(pt);
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}
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auto my_cdt = p2t::CDT(polyline);
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my_cdt.Triangulate();
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auto triangles = my_cdt.GetTriangles();
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/* Free the triangles */
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for (auto it = triangles.begin(); it != triangles.end(); it++) {
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auto triangle = *it;
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std::cout << "Triangle: " <<
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triangle->GetPoint(0)->x << "|" << triangle->GetPoint(0)->y << ","
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<< triangle->GetPoint(1)->x << "|" << triangle->GetPoint(1)->x << ","
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<< triangle->GetPoint(2)->x << "|" << triangle->GetPoint(2)->y
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<< std::endl;
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}
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/* Get the amount of triangles */
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auto count = triangles.size();
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*output_vertices = (float *)malloc(2*sizeof(float)*3*count);
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*vertex_count = count * 3;
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/* Free the points in the vector */
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for (unsigned int i = 0; i < count; i++) {
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for (int j = 0; j < 3; j++) {
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auto pt = triangles[i]->GetPoint(j);
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unsigned int idx = i * 6 + j * 2;
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(*output_vertices)[idx] = (float)pt->x;
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(*output_vertices)[idx + 1] = (float)pt->y;
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}
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}
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for (auto it = polyline.begin(); it != polyline.end(); it++)
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delete *it;
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return 0;
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}
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@ -1,4 +1,5 @@
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#include <preview-rendering/preview-rendering-gui.h>
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#include <poly2tri-wrapper/poly2tri-wrapper.h>
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#include <epoxy/gl.h>
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struct _OpenGlPreviewGui {
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@ -9,6 +10,7 @@ struct _OpenGlPreviewGui {
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unsigned int vao;
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unsigned int vbo;
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float color[4];
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gboolean line;
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};
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G_DEFINE_TYPE(OpenGlPreviewGui, opengl_preview_gui, G_TYPE_OBJECT)
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@ -47,12 +49,12 @@ static gboolean gl_area_render(GtkGLArea *area, GdkGLContext *context, gpointer
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glClearColor (0, 0, 0, 1.0);
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glClear (GL_COLOR_BUFFER_BIT);
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glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
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glPolygonMode(GL_FRONT_AND_BACK, gui->line ? GL_LINE : GL_FILL);
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glUseProgram(gui->polygon_shader_prog);
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glBindVertexArray(gui->vao);
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loc = glGetUniformLocation(gui->polygon_shader_prog, "const_color");
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glUniform4fv(loc, 1, gui->color);
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glDrawArrays(GL_TRIANGLES, 0, 3);
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glDrawArrays(GL_TRIANGLES, 0, 10*3);
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glFlush();
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@ -78,6 +80,7 @@ static int compile_shader_from_resource(GLenum shader_type, const char *res_name
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g_bytes_unref(res_bytes);
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if (shader)
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*shader = sh;
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return success;
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}
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@ -90,6 +93,9 @@ static gboolean gl_area_realize(GtkGLArea *area, gpointer user)
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unsigned int vao;
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OpenGlPreviewGui *gui;
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int success;
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struct gds_graphics gfx;
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struct gds_point points[12];
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size_t vertex_count;
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gui = GDS_RENDER_OPENGL_PREVIEW_GUI(user);
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@ -120,30 +126,85 @@ static gboolean gl_area_realize(GtkGLArea *area, gpointer user)
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glDeleteShader(fs);
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float vertices[] = {
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-0.5f, -0.5f,
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0.5f, -0.5f,
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0.0f, 0.5f,
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};
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gui->polygon_shader_prog = prog;
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gfx.vertices = NULL;
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points[0].x = -100;
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points[0].y = -100;
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points[1].x = -100;
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points[1].y = +100;
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points[2].x = +0;
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points[2].y = +100;
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points[3].x = +0;
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points[3].y = 20;
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points[4].x = -20;
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points[4].y = 20;
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points[5].x = -20;
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points[5].y = -20;
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points[6].x = 20;
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points[6].y = -20;
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points[7].x = 20;
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points[7].y = 20;
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points[8].x = 1;
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points[8].y = 20;
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points[9].x = 1;
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points[9].y = 100;
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points[10].x = 100;
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points[10].y = 100;
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points[11].x = 100;
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points[11].y = -100;
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gfx.gfx_type = GRAPHIC_POLYGON;
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for (int i = 0; i < 12; i++) {
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gfx.vertices = g_list_append(gfx.vertices, &points[i]);
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}
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float *vertices = NULL;
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tesselator_triangulate_polygon(&gfx, 180.0, &vertices, &vertex_count);
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glGenVertexArrays(1, &vao);
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glBindVertexArray(vao);
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glGenBuffers(1, &vbo);
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glBindBuffer(GL_ARRAY_BUFFER, vbo);
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glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
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glBufferData(GL_ARRAY_BUFFER, vertex_count*2*sizeof(float), vertices, GL_STATIC_DRAW);
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glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 2*sizeof(float), (void *)0);
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glEnableVertexAttribArray(0);
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free(vertices);
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gui->polygon_shader_prog = prog;
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gui->vao = vao;
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gui->vbo = vbo;
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g_list_free(gfx.vertices);
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return TRUE;
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}
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static void on_clicked(GtkWidget *sender, gboolean *p)
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{
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*p = !*p;
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}
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static void opengl_preview_gui_init(OpenGlPreviewGui *self)
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{
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GtkBuilder *builder;
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@ -153,6 +214,9 @@ static void opengl_preview_gui_init(OpenGlPreviewGui *self)
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self->gl_area = GTK_GL_AREA(gtk_builder_get_object(builder, "gl-area"));
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g_signal_connect(self->gl_area, "render", G_CALLBACK(gl_area_render), self);
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g_signal_connect(self->gl_area, "realize", G_CALLBACK(gl_area_realize), self);
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g_signal_connect(gtk_builder_get_object(builder, "test-button"), "clicked", G_CALLBACK(on_clicked), &self->line);
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self->line = FALSE;
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g_object_ref(self->gl_area);
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}
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@ -12,7 +12,7 @@
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<property name="can-focus">False</property>
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<property name="baseline-position">bottom</property>
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<child>
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<object class="GtkButton">
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<object class="GtkButton" id="test-button">
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<property name="label" translatable="yes">button</property>
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<property name="visible">True</property>
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<property name="can-focus">True</property>
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