Can build the project. Now trying to isolate opengl problem

src/body.cpp

@@ -0,0 +1,141 @@
+#include <cassert>
+#include <glad/glad.h>
+#include <map>
+#include <string>
+
+#include "util.hpp"
+#include "body.hpp"
+#include "shaders.hpp"
+
+using namespace std;
+
+enum class ParserState {
+    PREFIX,
+    VERTEX,
+    FACE,
+    FACE_SKIP,
+};
+
+static map<string, ObjData> cache;
+
+bool _parse_obj(ObjData* data, const char* obj_filepath);
+
+bool load_body(Body* out_body, const char* obj_filepath) {
+    ObjData data;
+    if (auto it = cache.find(obj_filepath); it != cache.end()) {
+        data = it->second;
+    } else if (_parse_obj(&data, obj_filepath)) {
+        cache[obj_filepath] = data;
+    } else {
+        return false;
+    }
+
+    // Need a good validation check here. This is a stand in.
+    if (data.verts_len == 0 || data.faces_len == 0) {
+        printf("Obj file appears incomplete or corrupted. Num verts %d. Num Faces %d.\n", data.verts_len,
+            data.faces_len);
+        return false;
+    }
+
+    uint vao, vbo, ebo;
+    vao = 0;
+    vbo = 0;
+    ebo = 0;
+
+    glGenVertexArrays(1, &vao);
+    glGenBuffers(1, &vbo);
+    glGenBuffers(1, &ebo);
+
+    glBindVertexArray(vao);
+
+    glBindBuffer(GL_ARRAY_BUFFER, vbo);
+    glBufferData(GL_ARRAY_BUFFER, data.verts_len * sizeof(float), data.verts, GL_STATIC_DRAW);
+
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, data.faces_len * sizeof(int), data.faces, GL_STATIC_DRAW);
+
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
+    glEnableVertexAttribArray(0);
+
+    *out_body = { .pose = glm::mat4(1), .ebo = ebo, .vao = vao, .vbo = vbo, .shader = 0, .data = data };
+    return true;
+}
+
+void draw_body(const Body& b) {
+    use_shader(b.shader);
+    set_uniform(b.shader, "global_t", glm::scale(b.pose, glm::vec3(b.scale)));
+    set_uniform(b.shader, "color", b.color);
+    glBindVertexArray(b.vao);
+    glDrawElements(GL_TRIANGLES, b.data.faces_len, GL_UNSIGNED_INT, 0);
+}
+
+void create_new_sphere(Body* b, float scale) { 
+    assert(load_body(b, "Icosphere.obj"));
+    b->scale = scale;
+}
+
+// I need to write a good obj file parser at some point. This is basically garbage
+bool _parse_obj(ObjData* data, const char* obj_filepath) {
+    string source;
+    if (!read_file(&source, obj_filepath)) {
+        return {};
+    }
+
+    size_t num_verts = 0;
+    size_t num_faces = 0;
+    for (int i = 1; i < source.size(); i++) {
+        if (source[i] == ' ' && source[i - 1] == 'v') {
+            num_verts++;
+        } else if (source[i] == ' ' && source[i - 1] == 'f') {
+            num_faces++;
+        }
+    }
+
+    float* verts = (float*)malloc(sizeof(float) * num_verts * 3);
+    int* faces = (int*)malloc(sizeof(int) * num_faces * 3);
+
+    int vert_i = 0;
+    int face_i = 0;
+
+    // Get ready for the parsing loop
+    ParserState state = ParserState::PREFIX;
+    int start = 0;
+
+    for (int i = 1; i < source.size(); i++) {
+        switch (state) {
+        case ParserState::PREFIX:
+            if (source[i - 1] == 'v' && source[i] == ' ') {
+                state = ParserState::VERTEX;
+                start = i + 1;
+            } else if (i > 0 && source[i - 1] == 'f' && source[i] == ' ') {
+                state = ParserState::FACE;
+                start = i + 1;
+            }
+            break;
+        case ParserState::VERTEX:
+            if (iswspace(source[i])) {
+                verts[vert_i++] = atof(&source[start]);
+                start = i + 1;
+            }
+            break;
+        case ParserState::FACE:
+            if (source[i] == '/') {
+                state = ParserState::FACE_SKIP;
+                faces[face_i++] = atoi(&source[start]) - 1;
+            }
+            break;
+        case ParserState::FACE_SKIP:
+            if (iswspace(source[i])) {
+                state = ParserState::FACE;
+                start = i + 1;
+            }
+        }
+        if (source[i] == '\n' || source[i] == '\r') {
+            state = ParserState::PREFIX;
+            continue;
+        }
+    }
+
+    *data = { .verts = verts, .verts_len = vert_i, .faces = faces, .faces_len = face_i };
+    return true;
+}