allemang.d/toddcox-visualize
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Add wireframe hypercube

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This commit is contained in:
David Allemang
2022-02-16 18:07:30 -05:00
parent ae10f00127
commit c302cc03a5
4 changed files with 185 additions and 3 deletions
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77
src/main.cpp
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@@ -75,7 +75,7 @@ void set_style() {
int run(GLFWwindow *window, ImGuiContext *context) {
State state;
auto mesh = ml::CubeMesh(0.5f);
auto mesh = ml::CubeMesh(0.25f);
// auto mesh = ml::read("circle.pak");
auto dynamic = (ml::DynamicMesh) mesh;
@@ -113,6 +113,39 @@ int run(GLFWwindow *window, ImGuiContext *context) {
);
glVertexArrayElementBuffer(vao, ibo);
auto wire_mesh = ml::WireCubeMesh(4, 0.33f);
auto wire_dynamic = (ml::DynamicMesh) wire_mesh;
GLuint wire_vao;
glCreateVertexArrays(1, &wire_vao);
GLuint wire_vbo;
glCreateBuffers(1, &wire_vbo);
glNamedBufferData(
wire_vbo,
(GLsizeiptr) (point_scalar_size * wire_dynamic.points().size()),
wire_dynamic.points().data(),
GL_STATIC_DRAW
);
glEnableVertexArrayAttrib(wire_vao, 0);
glVertexArrayVertexBuffer(wire_vao, 0,
wire_vbo, 0,
(GLsizeiptr) (point_scalar_size * wire_dynamic.points().rows())
);
glVertexArrayAttribFormat(wire_vao, 0, 4, GL_FLOAT, GL_FALSE, 0);
GLuint wire_ibo;
glCreateBuffers(1, &wire_ibo);
glGetError();
glNamedBufferData(
wire_ibo,
(GLsizeiptr) (cell_scalar_size * wire_dynamic.cells().size()),
wire_dynamic.cells().data(),
GL_STATIC_DRAW
);
glVertexArrayElementBuffer(wire_vao, wire_ibo);
std::ifstream vs_file("res/shaders/main.vert.glsl");
std::string vs_src(
(std::istreambuf_iterator<char>(vs_file)),
@@ -125,6 +158,18 @@ int run(GLFWwindow *window, ImGuiContext *context) {
glShaderSource(vs, 1, &vs_str, nullptr);
glCompileShader(vs);
std::ifstream wire_vs_file("res/shaders/4d.vert.glsl");
std::string wire_vs_src(
(std::istreambuf_iterator<char>(wire_vs_file)),
std::istreambuf_iterator<char>()
);
wire_vs_file.close();
const char *wire_vs_str = wire_vs_src.c_str();
GLuint wire_vs = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(wire_vs, 1, &wire_vs_str, nullptr);
glCompileShader(wire_vs);
std::ifstream fs_file("res/shaders/main.frag.glsl");
std::string fs_src(
(std::istreambuf_iterator<char>(fs_file)),
@@ -142,6 +187,11 @@ int run(GLFWwindow *window, ImGuiContext *context) {
glAttachShader(pgm, fs);
glLinkProgram(pgm);
GLuint wire_pgm = glCreateProgram();
glAttachShader(wire_pgm, wire_vs);
glAttachShader(wire_pgm, fs);
glLinkProgram(wire_pgm);
GLint link_status;
glGetProgramiv(pgm, GL_LINK_STATUS, &link_status);
if (!link_status) {
@@ -154,8 +204,16 @@ int run(GLFWwindow *window, ImGuiContext *context) {
return EXIT_FAILURE;
}
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glGetProgramiv(wire_pgm, GL_LINK_STATUS, &link_status);
if (!link_status) {
std::cerr << "Wire program link failed." << std::endl;
GLint vs_comp_status, fs_comp_status;
glGetShaderiv(vs, GL_COMPILE_STATUS, &vs_comp_status);
glGetShaderiv(fs, GL_COMPILE_STATUS, &fs_comp_status);
std::cerr << "vs compiled: " << std::boolalpha << (bool) vs_comp_status << std::endl;
std::cerr << "fs compiled: " << std::boolalpha << (bool) fs_comp_status << std::endl;
return EXIT_FAILURE;
}
glEnable(GL_DEPTH_TEST);
@@ -188,6 +246,15 @@ int run(GLFWwindow *window, ImGuiContext *context) {
glBindVertexArray(0);
glUseProgram(0);
glUseProgram(wire_pgm);
glBindVertexArray(wire_vao);
glUniform4fv(0, 1, state.fg);
glUniform1f(1, (GLfloat) glfwGetTime());
glUniformMatrix4fv(2, 1, false, proj.data());
glDrawElements(GL_LINES, (GLsizei) wire_dynamic.cells().size(), GL_UNSIGNED_INT, nullptr);
glBindVertexArray(0);
glUseProgram(0);
ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
glfwSwapBuffers(window);
}
@@ -196,6 +263,10 @@ int run(GLFWwindow *window, ImGuiContext *context) {
glDeleteBuffers(1, &ibo);
glDeleteVertexArrays(1, &vao);
glDeleteBuffers(1, &wire_vbo);
glDeleteBuffers(1, &wire_ibo);
glDeleteVertexArrays(1, &wire_vao);
return EXIT_SUCCESS;
}