init

1 files changed, 132 insertions, 0 deletions

diff --git a/src/junkcraft.c b/src/junkcraft.c
new file mode 100644
index 0000000..0d27175
--- /dev/null
+++ b/src/junkcraft.c
@@ -0,0 +1,132 @@
+#include <SDL2/SDL_events.h>
+#include <SDL2/SDL_pixels.h>
+#include <SDL2/SDL_rect.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "SDL2/SDL.h"
+#include "SDL2/SDL_video.h"
+#include "SDL2/SDL_render.h"
+#include "glad/glad.h"
+
+const float vertices[] = {
+   0.0f,  0.5f,  0.0f, // x,y,z of first point.
+   0.5f, -0.5f,  0.0f, // x,y,z of second point.
+  -0.5f, -0.5f,  0.0f  // x,y,z of third point.
+};
+
+
+const char* fragment_shader =
+"#version 410 core\n"
+"out vec4 frag_colour;"
+"in vec3 color;"
+"void main() {"
+"  frag_colour = vec4( color, 1.0 );"
+"}";
+
+const char* vertex_shader =
+"#version 410 core\n"
+"in vec3 vp;"
+"out vec3 color;"
+"void main() {"
+"  gl_Position = vec4( vp, 1.0 );"
+"  color = vp;"
+"}";
+
+GLuint shader_init() {
+    GLuint vs = glCreateShader( GL_VERTEX_SHADER );
+glShaderSource( vs, 1, &vertex_shader, NULL );
+glCompileShader( vs );
+GLuint fs = glCreateShader( GL_FRAGMENT_SHADER );
+glShaderSource( fs, 1, &fragment_shader, NULL );
+glCompileShader( fs );
+GLuint shader_program = glCreateProgram();
+glAttachShader( shader_program, fs );
+glAttachShader( shader_program, vs );
+glLinkProgram( shader_program );
+return shader_program;
+}
+
+GLuint vbo;
+
+void quit(int _val) {
+    fprintf(stderr, "Quitting");
+    exit(1);
+}
+
+void gl_buffer_init() {
+    //tell opengl we want mem for 1 buffer object
+    glGenBuffers(1, &vbo);
+    // set aray_buffer to above
+    glBindBuffer(GL_ARRAY_BUFFER, vbo);
+    // copy vertex data to gpu memory
+    glBufferData(GL_ARRAY_BUFFER, 9* sizeof(float), vertices, GL_STATIC_DRAW);
+    // cleanup
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+}
+
+int main() {
+    signal(SIGINT, quit);
+    SDL_Init(SDL_INIT_VIDEO);
+    // This will call SDL_GL_LoadLibrary so you don't need glad to do anything
+    SDL_Window* window = SDL_CreateWindow("Junkcraft", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 800, 600, SDL_WINDOW_OPENGL);
+
+    SDL_GLContext* ctx = SDL_GL_CreateContext(window);
+    // Let GLAD use the SDL GetProcAddress loader instead of using its own
+    int version = gladLoadGLLoader(SDL_GL_GetProcAddress);
+        if (version == 0) {
+        printf("Failed to initialize OpenGL context\n");
+        return -1;
+    }
+    printf("Loaded OpenGL %d\n", version);
+
+
+    if (window == NULL) {
+        perror("Failed to create window!");
+        SDL_DestroyWindow(window);
+        SDL_Quit();
+        return -1;
+    }
+
+    SDL_Renderer* render = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
+    if (render == NULL) {
+        perror("Failed to create renderer!");
+        SDL_DestroyWindow(window);
+        SDL_Quit();
+        return -1;
+    }
+
+    // SDL_RenderClear(render);
+    // SDL_Rect rect = { 0, 0, 100, 100 };
+    // SDL_SetRenderDrawColor(render, 255, 0, 0, SDL_ALPHA_OPAQUE);
+    SDL_ShowWindow(window);
+    // SDL_RenderFillRect(render, &rect);
+
+
+    gl_buffer_init();
+
+    GLuint array;
+    // Create VAO
+    glGenVertexArrays(1, &array);
+    glBindVertexArray(array);
+    // set array_buffer to pos buffer obj
+    glBindBuffer(GL_ARRAY_BUFFER, vbo);
+    /// allow vertex shader
+    // describe data and enable
+    glEnableVertexAttribArray(0);
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
+    // draw data as a triangle
+    //glDrawArrays(GL_TRIANGLES, 0, 3);
+    // set viewport
+    //glViewport(0, 0, 200, 100);
+    //final
+    GLuint shader_program = shader_init();
+    while (1) {
+        glClear(GL_COLOR_BUFFER_BIT);
+        glUseProgram( shader_program );
+        glBindVertexArray(array);
+        glDrawArrays(GL_TRIANGLES, 0, 3);
+        SDL_RenderPresent(render);
+    }
+    return 0;
+}