src/client/interact.c

   1 #include <linmath.h/linmath.h>
   2 #include <stdio.h>
   3 #include "client/camera.h"
   4 #include "client/client_node.h"
   5 #include "client/cube.h"
   6 #include "client/debug_menu.h"
   7 #include "client/frustum.h"
   8 #include "client/gl_debug.h"
   9 #include "client/gui.h"
  10 #include "client/interact.h"
  11 #include "client/mesh.h"
  12 #include "client/raycast.h"
  13 #include "client/shader.h"
  14
  15 struct InteractPointed interact_pointed;
  16
  17 static GLuint shader_prog;
  18 static GLint loc_MVP;
  19 static GLint loc_color;
  20 static mat4x4 model;
  21
  22 typedef struct {
  23         v3f32 position;
  24 } __attribute__((packed)) SelectionVertex;
  25 static Mesh selection_mesh = {
  26         .layout = &(VertexLayout) {
  27                 .attributes = (VertexAttribute[]) {
  28                         {GL_FLOAT, 3, sizeof(v3f32)},
  29                 },
  30                 .count = 1,
  31                 .size = sizeof(SelectionVertex),
  32         },
  33         .vao = 0,
  34         .vbo = 0,
  35         .data = NULL,
  36         .count = 36,
  37         .free_data = false,
  38 };
  39
  40 bool interact_init()
  41 {
  42         if (!shader_program_create(RESSOURCE_PATH "shaders/3d/selection", &shader_prog, NULL)) {
  43                 fprintf(stderr, "[error] failed to create selection shader program\n");
  44                 return false;
  45         }
  46
  47         loc_MVP = glGetUniformLocation(shader_prog, "MVP"); GL_DEBUG
  48         loc_color = glGetUniformLocation(shader_prog, "color"); GL_DEBUG
  49
  50         SelectionVertex vertices[6][6];
  51         for (int f = 0; f < 6; f++)
  52                 for (int v = 0; v < 6; v++)
  53                         vertices[f][v].position = v3f32_scale(cube_vertices[f][v].position, 1.1f);
  54
  55         selection_mesh.data = vertices;
  56         mesh_upload(&selection_mesh);
  57
  58         gui_add(NULL, (GUIElementDef) {
  59                 .pos = {0.5f, 0.5f},
  60                 .z_index = 0.0f,
  61                 .offset = {0, 0},
  62                 .margin = {0, 0},
  63                 .align = {0.5f, 0.5f},
  64                 .scale = {1.0f, 1.0f},
  65                 .scale_type = SCALE_IMAGE,
  66                 .affect_parent_scale = false,
  67                 .text = NULL,
  68                 .image = texture_load(RESSOURCE_PATH "textures/crosshair.png", false),
  69                 .text_color = {0.0f, 0.0f, 0.0f, 0.0f},
  70                 .bg_color = {0.0f, 0.0f, 0.0f, 0.0f},
  71         });
  72
  73         return true;
  74 }
  75
  76 void interact_deinit()
  77 {
  78         glDeleteProgram(shader_prog); GL_DEBUG
  79         mesh_destroy(&selection_mesh);
  80 }
  81
  82 void interact_tick()
  83 {
  84         bool old_exists = interact_pointed.exists;
  85         v3s32 old_pointed = interact_pointed.pos;
  86         if ((interact_pointed.exists = raycast(
  87                                 (v3f64) {camera.eye  [0], camera.eye  [1], camera.eye  [2]},
  88                                 (v3f64) {camera.front[0], camera.front[1], camera.front[2]},
  89                                 5, &interact_pointed.pos, &interact_pointed.node))
  90                         && !v3s32_equals(interact_pointed.pos, old_pointed)) {
  91                 mat4x4_translate(model,
  92                         interact_pointed.pos.x, interact_pointed.pos.y, interact_pointed.pos.z);
  93                 v3f32 *color = &client_node_defs[interact_pointed.node].selection_color;
  94                 glProgramUniform3f(shader_prog, loc_color, color->x, color->y, color->z); GL_DEBUG
  95                 debug_menu_changed(ENTRY_POINTED);
  96         }
  97
  98         if (old_exists && !interact_pointed.exists)
  99                 debug_menu_changed(ENTRY_POINTED);
 100 }
 101
 102 void interact_render()
 103 {
 104         if (!interact_pointed.exists)
 105                 return;
 106
 107         mat4x4 mvp;
 108         mat4x4_mul(mvp, frustum, model);
 109
 110         glUseProgram(shader_prog); GL_DEBUG
 111         glUniformMatrix4fv(loc_MVP, 1, GL_FALSE, mvp[0]); GL_DEBUG
 112         mesh_render(&selection_mesh);
 113 }