more stuff

const.h

@@ -5,15 +5,18 @@ typedef struct Vertex {
   float pos[3];
 } Vertex;
 
-#define CHUNK_LENGTH 16
+#define CHUNK_LENGTH 64 //32
 #define CHUNK_RADIUS_H 8
 #define CHUNK_RADIUS_V 4
 
+#define CTRI_ALL BLOCK_ALL * 18 * sizeof(Vertex)
+#define TEXT_GAP_H 1 / 3.0
+#define TEXT_GAP_V 1 / 1.0
+
 #define CHUNK_DIAMETER_H (CHUNK_RADIUS_H * 2 + 1)
 #define CHUNK_DIAMETER_V (CHUNK_RADIUS_V * 2 + 1)
 #define CHUNK_ALL CHUNK_DIAMETER_H *CHUNK_DIAMETER_H *CHUNK_DIAMETER_V
 #define BLOCK_ALL CHUNK_LENGTH *CHUNK_LENGTH *CHUNK_LENGTH
 #define CBLOCK_ALL BLOCK_ALL *CHUNK_ALL
-#define CTRI_ALL BLOCK_ALL * 18 * sizeof(Vertex)
 
 #endif

cubes.c

@@ -1,18 +1,41 @@
 #include "const.h"
+//#include <stdio.h>
+#include <stdlib.h>
 
 // placeholder function
 int cubeExists(int x, int y, int z) {
-  return ((x % 3) == (y % 4) && (y % 5) == (z % 6));
+  srand(x ^ y ^ z);
+  return ((rand() % 3 == 0) && y == 1);
 }
 
-void gen_face(Vertex *cube, int i, int x, int y, int z, int j) {
+void gen_face(Vertex *cube, int i, int x, int y, int z, int j, int is_text) {
   Vertex a = {{x, y, z}};
+
+  if (is_text) {
+    a.pos[i]--;
+    int exists =
+        cubeExists(x, y, z) != cubeExists(a.pos[0], a.pos[1], a.pos[2]);
+    a.pos[0] = exists ? TEXT_GAP_H * i : -1.0;
+    a.pos[1] = exists ? TEXT_GAP_V * i : -1.0;
+    a.pos[2] = 0;
+  }
+
   Vertex b = a;
-  b.pos[(i==0)?1:0]++;
   Vertex c = a;
+  Vertex d = a;
+
+  if (is_text) {
+    b.pos[0] += TEXT_GAP_H;
+    c.pos[1] += TEXT_GAP_V;
+    d.pos[0] += TEXT_GAP_H;
+    d.pos[1] += TEXT_GAP_V;
+  } else {
+    b.pos[(i == 0) ? 1 : 0]++;
     c.pos[(i == 2) ? 1 : 2]++;
-  Vertex d = c;
     d.pos[(i == 0) ? 1 : 0]++;
+    d.pos[(i == 2) ? 1 : 2]++;
+  }
+
   cube[j] = a;
   cube[j + 1] = b;
   cube[j + 2] = c;
@@ -21,7 +44,7 @@ void gen_face(Vertex *cube, int i, int x, int y, int z, int j) {
   cube[j + 5] = d;
 }
 
-void gen_cubes(Vertex *cube, int x, int y, int z) {
+void gen_cubes(Vertex *cube, int x, int y, int z, int is_text) {
   int i = 0;
   for (int y2 = y; y2 < y + CHUNK_LENGTH; y2++) {
     int y3 = y2;
@@ -29,9 +52,14 @@ void gen_cubes(Vertex *cube, int x, int y, int z) {
       int x3 = x2;
       for (int z2 = z; z2 < z + CHUNK_LENGTH; z2++) {
         int z3 = z2;
-        gen_face(cube, 0, x3, y3, z3, i);
-        gen_face(cube, 1, x3, y3, z3, i + 6);
-        gen_face(cube, 2, x3, y3, z3, i + 12);
+
+        if (is_text) {
+          x3 = y3 = z3 = 0;
+        }
+
+        gen_face(cube, 0, x2, y2, z2, i, is_text);
+        gen_face(cube, 1, x2, y2, z2, i + 6, is_text);
+        gen_face(cube, 2, x2, y2, z2, i + 12, is_text);
         i += 18;
       }
     }

cubes.h

@@ -1,3 +1,3 @@
 #include "const.h"
 
-void gen_cubes(Vertex *cube, int x, int y, int z);
+void gen_cubes(Vertex *cube, int x, int y, int z, int is_text);

main.c

@@ -5,11 +5,12 @@
 #include "gl.h"
 #define GLFW_INCLUDE_NONE
 #include <GLFW/glfw3.h>
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"
 
 #include "const.h"
 #include "cubes.h"
 #include "linmath.h"
-#include "stb_image.h"
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -17,13 +18,13 @@
 static const char *vertex_shader_text =
     "#version 330\n"
     "layout (location = 0) in vec3 vPos;"
-    //"layout (location = 1) in vec3 vOff;"
+    "layout (location = 1) in vec3 vOff;"
     "uniform mat4 MVP;\n"
     "out vec2 vTex;\n"
     "void main()\n"
     "{\n"
     "    gl_Position = MVP * vec4(vPos, 1.0);\n"
-    "    vTex=0.5*vPos.xy + vec2(0.5,0);\n"
+    "    vTex=vec2(vOff);\n"
     "}\n";
 
 static const char *fragment_shader_text =
@@ -34,13 +35,22 @@ static const char *fragment_shader_text =
     "void main()\n"
     "{\n"
     //"    color=vec4(vTex.rg,0.5,0.5);\n"
-    "    color=vec4(texture(texSampler, vTex).rg+vTex/10.0,0.5,0.5);\n"
+    "    if (vTex.x < 0.0 || vTex.y < 0.0) { discard; }\n"
+    "    color=vec4(texture(texSampler, vTex).rgb,0.5);\n"
     "}\n";
 
+int isCursor = 0;
+
 static void key_callback(GLFWwindow *window, int key, int scancode, int action,
                          int mods) {
-  if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
+  /*if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
     glfwSetWindowShouldClose(window, GLFW_TRUE);
+*/
+  if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS) {
+    isCursor = glfwGetInputMode(window, GLFW_CURSOR) == GLFW_CURSOR_DISABLED;
+    glfwSetInputMode(window, GLFW_CURSOR,
+                     isCursor ? GLFW_CURSOR_NORMAL : GLFW_CURSOR_DISABLED);
+  }
 }
 
 double cx = 0;
@@ -48,6 +58,8 @@ double cy = 0;
 int width, height;
 
 static void cursor_position_callback(GLFWwindow *window, double x, double y) {
+  if (isCursor)
+    return;
   cx = (x - width / 2.0) / -1000.0;
   cy = (y - height / 2.0) / -1000.0;
   cy = (cy > M_PI / 2) ? M_PI / 2 : ((cy < -M_PI / 2) ? -M_PI / 2 : cy);
@@ -74,12 +86,27 @@ int main(void) {
   glfwSwapInterval(1);
 
   Vertex *cube = malloc(CTRI_ALL);
-  gen_cubes(cube, 0, 0, 0);
+  Vertex *text = malloc(CTRI_ALL);
+  gen_cubes(cube, 0, 0, 0, 0);
+  gen_cubes(text, 0, 0, 0, 1);
 
-  GLuint vertex_buffer;
-  glGenBuffers(1, &vertex_buffer);
-  glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
+  GLuint vertex_buffer[2];
+
+  GLuint vertex_array;
+  glGenVertexArrays(1, &vertex_array);
+  glBindVertexArray(vertex_array);
+
+  glGenBuffers(2, vertex_buffer);
+
+  glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer[1]);
+  glBufferData(GL_ARRAY_BUFFER, CTRI_ALL, text, GL_STATIC_DRAW);
+  glEnableVertexAttribArray(1);
+  glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void *)0);
+
+  glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer[0]);
   glBufferData(GL_ARRAY_BUFFER, CTRI_ALL, cube, GL_STATIC_DRAW);
+  glEnableVertexAttribArray(0);
+  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void *)0);
 
   GLuint vertex_shader = glCreateShader(GL_VERTEX_SHADER);
   glShaderSource(vertex_shader, 1, &vertex_shader_text, NULL);
@@ -95,22 +122,12 @@ int main(void) {
   glLinkProgram(program);
 
   GLint tex_location = glGetUniformLocation(program, "texSampler");
-  GLint vpos_location = 0;
   GLint mvp_location = glGetUniformLocation(program, "MVP");
 
-  GLuint vertex_array;
-  glGenVertexArrays(1, &vertex_array);
-  glBindVertexArray(vertex_array);
+  unsigned char *pixels;
 
-  glEnableVertexAttribArray(vpos_location);
-  glVertexAttribPointer(vpos_location, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex),
-                        (void *)0);
-
-  unsigned char pixels[1024 * 1024 * 3];
-
-  for (int i = 0; i < 1024 * 1024 * 3; i++) {
-    pixels[i] = i * 69420;
-  }
+  int tx, ty, ch;
+  pixels = stbi_load("./test.png", &tx, &ty, &ch, 3);
 
   glClearColor(0.2f, 0.5f, 0.7f, 1.0f);
   glEnable(GL_TEXTURE_2D);
@@ -122,9 +139,9 @@ int main(void) {
   vec3 pos = {0, 0, 0};
 
   int x = 0, y = 25, z = 0;
+  glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
 
   while (!glfwWindowShouldClose(window)) {
-    glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
 
     glfwGetFramebufferSize(window, &width, &height);
     const float ratio = width / (float)height;
@@ -136,8 +153,8 @@ int main(void) {
 
     glBindTexture(GL_TEXTURE_2D, GL_TEXTURE0);
 
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 16, 16, 0, GL_RGB,
-                 GL_UNSIGNED_BYTE, pixels);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, tx, ty, 0, GL_RGB, GL_UNSIGNED_BYTE,
+                 pixels);
 
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);