crosshair

control.c

@@ -134,8 +134,10 @@ struct v3f control_rtrace(double cx, double cy, vec3 pos, int mode) {
 
     vec3_add(temp_pos, temp_pos, temp_dir);
 
-    if (gen_cube(temp_pos[0],temp_pos[1],temp_pos[2],placeChunk,0,-1) != 0) {
+    if (gen_cube(temp_pos[0], temp_pos[1], temp_pos[2], placeChunk, 0, -1) !=
-      if (mode == 0) vec3_sub(temp_pos,temp_pos,temp_dir);
+        0) {
+      if (mode == 0)
+        vec3_sub(temp_pos, temp_pos, temp_dir);
       break;
     }
   }
@@ -149,15 +151,21 @@ struct v3f control_rtrace(double cx, double cy, vec3 pos, int mode) {
 void control_lclick(double cx, double cy, vec3 pos) {
   struct v3f highlighted = control_rtrace(cx, cy, pos, 1);
   struct chunk placeChunk;
-  int cube = gen_cube(highlighted.pos[0],highlighted.pos[1],highlighted.pos[2],placeChunk,0,-1);
+  int cube = gen_cube(highlighted.pos[0], highlighted.pos[1],
-  if (cube == 0) return;
+                      highlighted.pos[2], placeChunk, 0, -1);
-  gen_cube(highlighted.pos[0],highlighted.pos[1],highlighted.pos[2],placeChunk,0,0);
+  if (cube == 0)
+    return;
+  gen_cube(highlighted.pos[0], highlighted.pos[1], highlighted.pos[2],
+           placeChunk, 0, 0);
 }
 
 void control_rclick(double cx, double cy, vec3 pos) {
   struct v3f highlighted = control_rtrace(cx, cy, pos, 0);
   struct chunk placeChunk;
-  int cube = gen_cube(highlighted.pos[0],highlighted.pos[1],highlighted.pos[2],placeChunk,0,-1);
+  int cube = gen_cube(highlighted.pos[0], highlighted.pos[1],
-  if (cube != 0) return;
+                      highlighted.pos[2], placeChunk, 0, -1);
-  gen_cube(highlighted.pos[0],highlighted.pos[1],highlighted.pos[2],placeChunk,0,1);
+  if (cube != 0)
+    return;
+  gen_cube(highlighted.pos[0], highlighted.pos[1], highlighted.pos[2],
+           placeChunk, 0, 1);
 }

cubes.c

@@ -22,6 +22,38 @@ int oz = -1024;
 
 struct chunk *chunk_old = NULL;
 
+void cubes_rect(struct v3f *cube, int *i, double x1, double x2, double y1,
+               double y2, int is_text, int text_x, int text_y) {
+  struct v3f a2 = {{x1, y1, 0}};
+  if (is_text) {
+    a2.pos[0] = TEXT_GAP_H * text_x;
+    a2.pos[1] = TEXT_GAP_V * text_y;
+    a2.pos[2] = 0;
+  }
+  struct v3f b = a2;
+  struct v3f c = a2;
+  struct v3f d = a2;
+
+  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[0]++;
+    c.pos[1]++;
+    d.pos[0]++;
+    d.pos[1]++;
+  }
+
+  cube[*i] = a2;
+  cube[*i + 1] = b;
+  cube[*i + 2] = c;
+  cube[*i + 3] = c;
+  cube[*i + 4] = b;
+  cube[*i + 5] = d;
+}
+
 void cubes_face(struct v3f *cube, int i, int x, int y, int z, int x2, int y2,
                 int z2, int *j, int is_text, struct chunk dat, int ci, int a3) {
   struct v3i a = {{x, y, z}};
@@ -137,7 +169,8 @@ void cubes_free() { free(chunk_old); }
 void cubes_refresh(int x, int y, int z, struct chunk dat) {
   for (int i = 0; i < CHUNK_ALL; i++) {
     if (chunk_old[i].exists != 0 && abs(((int)chunk_old[i].x) - x) <= 1 &&
-        abs(((int)chunk_old[i].y) - y) <= 1 && abs(((int)chunk_old[i].z) - z) <= 1) {
+        abs(((int)chunk_old[i].y) - y) <= 1 &&
+        abs(((int)chunk_old[i].z) - z) <= 1) {
       chunk_old[i].exists = 0;
     }
   }

cubes.h

@@ -7,7 +7,7 @@
 #define CHUNK_RADIUS_V 4 // 4
 
 #define TEXT_GAP_H 1 / 6.0
-#define TEXT_GAP_V 1 / 6.0
+#define TEXT_GAP_V 1 / 7.0
 
 #define CHUNK_DIAMETER_H (CHUNK_RADIUS_H * 2 + 1)
 #define CHUNK_DIAMETER_V (CHUNK_RADIUS_V * 2 + 1)
@@ -15,6 +15,7 @@
 #define BLOCK_ALL CHUNK_LENGTH *CHUNK_LENGTH *CHUNK_LENGTH
 #define CBLOCK_ALL BLOCK_ALL *CHUNK_ALL
 #define CBUF_ALL 2
+#define UI_ALL 1024
 
 #define CTRI_ALL CBLOCK_ALL * 18 * sizeof(struct v3f)
 
@@ -43,4 +44,6 @@ int cubes_vert(struct v3f *cube, struct v3f *text, struct v3f *cubeO,
 
 void cubes_free();
 void cubes_refresh(int x, int y, int z, struct chunk dat);
+void cubes_rect(struct v3f *cube, int *i, double x1, double x2, double y1,
+               double y2, int is_text, int text_x, int text_y);
 #endif

main.c

@@ -37,13 +37,16 @@ static const char *fragment_shader_text =
     "in vec3 v_pos_out;\n"
     "uniform sampler2D sampler_tex;\n"
     "uniform vec3 center;\n"
+    "uniform int use_shading;\n"
     "float dist;\n"
     "void main()\n"
     "{\n"
     //"    color=vec4(v_tex.rg,0.5,0.5);\n"
-    "    if (v_tex.x < 0.0 || v_tex.y < 0.0) { discard; }\n"
+    "    if (v_tex.x < 0.0 || v_tex.y < 0.0 || texture(sampler_tex, v_tex).a "
+    "== 0.0) { discard; }\n"
     "    dist = distance(v_pos_out, center + vec3(8,8,8))/65;\n"
     "    if (dist > 1.0) { dist = 1.0; }\n"
+    "    if (use_shading == 0) { dist = 0.0; }\n"
     "    color=vec4(texture(sampler_tex, v_tex).rgb,1.0)*(1.0-(dist*dist)) + "
     "vec4(0.2,0.5,0.7,1.0)*(dist*dist);\n"
     "}\n";
@@ -144,8 +147,8 @@ int main(void) {
 
   struct v3f *cube = malloc(CTRI_ALL);
   struct v3f *text = malloc(CTRI_ALL);
-  struct v3f *cubeO = malloc(CTRI_ALL);
+  struct v3f *cubeO = malloc(CTRI_ALL + UI_ALL * 18 * sizeof(struct v3f));
-  struct v3f *textO = malloc(CTRI_ALL);
+  struct v3f *textO = malloc(CTRI_ALL + UI_ALL * 18 * sizeof(struct v3f));
   int bleh = (CHUNK_DIAMETER_H) * (CHUNK_DIAMETER_V);
   int *i2 = calloc(CHUNK_ALL, sizeof(int));
 
@@ -158,13 +161,13 @@ int main(void) {
   glGenBuffers(2, vertex_buffer);
 
   glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer[1]);
-  glBufferData(GL_ARRAY_BUFFER, CTRI_ALL, text, GL_STATIC_DRAW);
+  glBufferData(GL_ARRAY_BUFFER, CTRI_ALL + UI_ALL* 18 * sizeof(struct v3f), textO, GL_STATIC_DRAW);
   glEnableVertexAttribArray(1);
   glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(struct v3f),
                         (void *)0);
 
   glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer[0]);
-  glBufferData(GL_ARRAY_BUFFER, CTRI_ALL, cube, GL_STATIC_DRAW);
+  glBufferData(GL_ARRAY_BUFFER, CTRI_ALL + UI_ALL * 18 * sizeof(struct v3f), cubeO, GL_STATIC_DRAW);
   glEnableVertexAttribArray(0);
   glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(struct v3f),
                         (void *)0);
@@ -185,11 +188,12 @@ int main(void) {
   GLint tex_location = glGetUniformLocation(program, "sampler_tex");
   GLint mvp_location = glGetUniformLocation(program, "mvp");
   GLint center_location = glGetUniformLocation(program, "center");
+  GLint use_shading = glGetUniformLocation(program, "use_shading");
 
   unsigned char *pixels;
 
   int tx, ty, ch;
-  pixels = stbi_load("./test.png", &tx, &ty, &ch, 3);
+  pixels = stbi_load("./test.png", &tx, &ty, &ch, 4);
 
   glClearColor(0.2f, 0.5f, 0.7f, 1.0f);
   glEnable(GL_TEXTURE_2D);
@@ -326,7 +330,7 @@ int main(void) {
 
     glBindTexture(GL_TEXTURE_2D, GL_TEXTURE0);
 
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, tx, ty, 0, GL_RGB, GL_UNSIGNED_BYTE,
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tx, ty, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                  pixels);
 
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
@@ -336,7 +340,35 @@ int main(void) {
 
     glBindVertexArray(vertex_array);
 
+    glUniform1i(use_shading, 1);
+
     glDrawArrays(GL_TRIANGLES, 0, cube_count);
+
+    glClear(GL_DEPTH_BUFFER_BIT);
+
+    glUniform1i(use_shading, 0);
+
+    int iz = CBLOCK_ALL * 18;
+    cubes_rect(cubeO, &iz, -0.5,0.5, -0.5, 0.5, 0, 0, 6);
+    cubes_rect(textO, &iz, -0.5, 0.5, -0.5, 0.5, 1, 0, 6);
+
+    mat4x4_identity(v);
+    mat4x4_ortho(p, -ratio*15, ratio*15, -1.f*15, 1.f*15, 1.0f, -1.0f);
+    mat4x4_mul(mvp, p, v);
+    mat4x4_mul(mvp, mvp, m);
+
+    glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat *)&mvp);
+
+    glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer[1]);
+    glBufferSubData(GL_ARRAY_BUFFER, CTRI_ALL,
+                    (long)6 * sizeof(struct v3f), &textO[iz]);
+    glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer[0]);
+    glBufferSubData(GL_ARRAY_BUFFER, CTRI_ALL,
+                    (long)6 * sizeof(struct v3f), &cubeO[iz]);
+
+    glBindVertexArray(vertex_array);
+
+    glDrawArrays(GL_TRIANGLES, CBLOCK_ALL * 18, 6);
   }
 
   free(cube);