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tut02.cpp 5.6 KiB

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  1. //
  2. // Lol Engine - Cube tutorial
  3. //
  4. // Copyright: (c) 2011 Sam Hocevar <sam@hocevar.net>
  5. // This program is free software; you can redistribute it and/or
  6. // modify it under the terms of the Do What The Fuck You Want To
  7. // Public License, Version 2, as published by Sam Hocevar. See
  8. // http://sam.zoy.org/projects/COPYING.WTFPL for more details.
  9. //
  10. #if defined HAVE_CONFIG_H
  11. # include "config.h"
  12. #endif
  13. #include "core.h"
  14. #include "lolgl.h"
  15. #include "loldebug.h"
  16. using namespace std;
  17. using namespace lol;
  18. #if USE_SDL && defined __APPLE__
  19. # include <SDL_main.h>
  20. #endif
  21. #if defined _WIN32
  22. # undef main /* FIXME: still needed? */
  23. #endif
  24. class Cube : public WorldEntity
  25. {
  26. public:
  27. Cube()
  28. {
  29. m_angle = 0;
  30. /* Front */
  31. m_vertices[0] = vec3(-1.0, -1.0, 1.0);
  32. m_vertices[1] = vec3( 1.0, -1.0, 1.0);
  33. m_vertices[2] = vec3( 1.0, 1.0, 1.0);
  34. m_vertices[3] = vec3(-1.0, 1.0, 1.0);
  35. /* Back */
  36. m_vertices[4] = vec3(-1.0, -1.0, -1.0);
  37. m_vertices[5] = vec3( 1.0, -1.0, -1.0);
  38. m_vertices[6] = vec3( 1.0, 1.0, -1.0);
  39. m_vertices[7] = vec3(-1.0, 1.0, -1.0);
  40. m_colors[0] = vec3(1.0, 0.0, 0.0);
  41. m_colors[1] = vec3(0.0, 1.0, 0.0);
  42. m_colors[2] = vec3(0.0, 0.0, 1.0);
  43. m_colors[3] = vec3(1.0, 1.0, 1.0);
  44. m_colors[4] = vec3(1.0, 0.0, 0.0);
  45. m_colors[5] = vec3(0.0, 1.0, 0.0);
  46. m_colors[6] = vec3(0.0, 0.0, 1.0);
  47. m_colors[7] = vec3(1.0, 1.0, 1.0);
  48. m_indices[0] = i16vec3(0, 1, 2);
  49. m_indices[1] = i16vec3(2, 3, 0);
  50. m_indices[2] = i16vec3(1, 5, 6);
  51. m_indices[3] = i16vec3(6, 2, 1);
  52. m_indices[4] = i16vec3(7, 6, 5);
  53. m_indices[5] = i16vec3(5, 4, 7);
  54. m_indices[6] = i16vec3(4, 0, 3);
  55. m_indices[7] = i16vec3(3, 7, 4);
  56. m_indices[8] = i16vec3(4, 5, 1);
  57. m_indices[9] = i16vec3(1, 0, 4);
  58. m_indices[10] = i16vec3(3, 2, 6);
  59. m_indices[11] = i16vec3(6, 7, 3);
  60. }
  61. virtual void TickGame(float deltams)
  62. {
  63. WorldEntity::TickGame(deltams);
  64. m_angle += deltams / 1000.0f * 45.0f;
  65. mat4 anim = mat4::rotate(m_angle, vec3(0, 1, 0));
  66. mat4 model = mat4::translate(vec3(0, 0, -4));
  67. mat4 view = mat4::lookat(vec3(0, 2, 0), vec3(0, 0, -4), vec3(0, 1, 0));
  68. mat4 proj = mat4::perspective(45.0f, 640.0f, 480.0f, 0.1f, 10.0f);
  69. m_matrix = proj * view * model * anim;
  70. }
  71. virtual void TickDraw(float deltams)
  72. {
  73. WorldEntity::TickDraw(deltams);
  74. if (!m_ready)
  75. {
  76. m_shader = Shader::Create(
  77. "#version 120\n"
  78. "attribute vec3 in_Vertex;"
  79. "attribute vec3 in_Color;"
  80. "uniform mat4 in_Matrix;"
  81. "varying vec3 pass_Color;"
  82. ""
  83. "void main(void) {"
  84. " gl_Position = in_Matrix * vec4(in_Vertex, 1.0);"
  85. " pass_Color = in_Color;"
  86. "}",
  87. "#version 120\n"
  88. "varying vec3 pass_Color;"
  89. ""
  90. "void main(void) {"
  91. " gl_FragColor = vec4(pass_Color, 1.0);"
  92. "}");
  93. m_coord = m_shader->GetAttribLocation("in_Vertex");
  94. m_color = m_shader->GetAttribLocation("in_Color");
  95. m_mvp = m_shader->GetUniformLocation("in_Matrix");
  96. m_ready = true;
  97. #if !defined __CELLOS_LV2__ && !defined __ANDROID__ && !defined __APPLE__
  98. /* Method 1: store vertex buffer on the GPU memory */
  99. glGenBuffers(1, &m_vbo);
  100. glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
  101. glBufferData(GL_ARRAY_BUFFER, sizeof(m_vertices), m_vertices,
  102. GL_STATIC_DRAW);
  103. glGenBuffers(1, &m_cbo);
  104. glBindBuffer(GL_ARRAY_BUFFER, m_cbo);
  105. glBufferData(GL_ARRAY_BUFFER, sizeof(m_colors), m_colors,
  106. GL_STATIC_DRAW);
  107. glGenBuffers(1, &m_ibo);
  108. glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_ibo);
  109. glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(m_indices), m_indices,
  110. GL_STATIC_DRAW);
  111. #else
  112. #endif
  113. /* FIXME: this object never cleans up */
  114. }
  115. m_shader->Bind();
  116. m_shader->SetUniform(m_mvp, m_matrix);
  117. #if !defined __CELLOS_LV2__ && !defined __ANDROID__ && !defined __APPLE__
  118. glEnableVertexAttribArray(m_coord);
  119. glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
  120. glVertexAttribPointer(m_coord, 3, GL_FLOAT, GL_FALSE, 0, 0);
  121. glEnableVertexAttribArray(m_color);
  122. glBindBuffer(GL_ARRAY_BUFFER, m_cbo);
  123. glVertexAttribPointer(m_color, 3, GL_FLOAT, GL_FALSE, 0, 0);
  124. glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_ibo);
  125. int size;
  126. glGetBufferParameteriv(GL_ELEMENT_ARRAY_BUFFER, GL_BUFFER_SIZE, &size);
  127. glDrawElements(GL_TRIANGLES, size / sizeof(uint16_t), GL_UNSIGNED_SHORT, 0);
  128. glDisableVertexAttribArray(m_coord);
  129. glDisableVertexAttribArray(m_color);
  130. glBindBuffer(GL_ARRAY_BUFFER, 0);
  131. #else
  132. glEnableClientState(GL_VERTEX_ARRAY);
  133. glVertexPointer(3, GL_FLOAT, 0, m_vertices);
  134. glDisableClientState(GL_VERTEX_ARRAY);
  135. #endif
  136. }
  137. private:
  138. float m_angle;
  139. mat4 m_matrix;
  140. vec3 m_vertices[8];
  141. vec3 m_colors[8];
  142. i16vec3 m_indices[12];
  143. Shader *m_shader;
  144. #if !defined __CELLOS_LV2__ && !defined __ANDROID__ && !defined __APPLE__
  145. GLuint m_vbo, m_cbo, m_ibo;
  146. #endif
  147. int m_coord, m_color, m_mvp;
  148. bool m_ready;
  149. };
  150. int main(int argc, char **argv)
  151. {
  152. Application app("Tutorial 2: Cube", ivec2(640, 480), 60.0f);
  153. new DebugFps(5, 5);
  154. new Cube();
  155. app.Run();
  156. return EXIT_SUCCESS;
  157. }