fishladder.c

   1 // Copyright (C) 2021 Harry Godden (hgn) - All Rights Reserved
   2
   3 //#define VG_STEAM
   4 #include "vg/vg.h"
   5
   6 SHADER_DEFINE( colour_shader,
   7
   8         // VERTEX
   9         "layout (location=0) in vec3 a_co;"
  10         "uniform mat4 uPvm;"
  11         ""
  12         "void main()"
  13         "{"
  14         "       vec4 vert_pos = uPvm * vec4( a_co, 1.0 );"
  15         "       gl_Position = vert_pos;"
  16         "}",
  17
  18         // FRAGMENT
  19         "out vec4 FragColor;"
  20         "uniform vec4 uColour;"
  21         ""
  22         "void main()"
  23         "{"
  24         "       FragColor = uColour;"
  25         "}"
  26         ,
  27         UNIFORMS({ "uPvm", "uColour" })
  28 )
  29
  30 mat4 m_projection;
  31 mat4 m_view;
  32 mat4 m_pv;
  33
  34 int main( int argc, char *argv[] )
  35 {
  36         vg_init( argc, argv, "FishLadder" );
  37 }
  38
  39 void vg_update(void)
  40 {
  41         // Update camera
  42         float ratio = (float)vg_window_y / (float)vg_window_x;
  43         float const size = 7.5f;
  44         glm_ortho( -size, size, -size*ratio, size*ratio, 0.1f, 100.f, m_projection );
  45
  46         glm_mat4_identity( m_view );
  47         glm_translate_z( m_view, -10.f );
  48         glm_rotate_x( m_view, -1.0f, m_view );
  49
  50         glm_mat4_mul( m_projection, m_view, m_pv );
  51 }
  52
  53 GLuint tile_vao;
  54 GLuint tile_vbo;
  55
  56 void vg_render(void)
  57 {
  58         glEnable( GL_DEPTH_TEST );
  59         glClearColor( 0.94f, 0.94f, 0.94f, 1.0f );
  60         glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
  61
  62         SHADER_USE( colour_shader );
  63         glUniformMatrix4fv( SHADER_UNIFORM( colour_shader, "uPvm" ), 1, GL_FALSE, (float *)m_pv );
  64         glUniform4f( SHADER_UNIFORM( colour_shader, "uColour" ), 0.5f, 0.5f, 0.5f, 1.0f );
  65
  66         glBindVertexArray( tile_vao );
  67         glDrawArrays( GL_TRIANGLES, 0, 6 );
  68 }
  69
  70 void vg_start(void)
  71 {
  72         SHADER_INIT( colour_shader );
  73
  74         glGenVertexArrays( 1, &tile_vao );
  75         glGenBuffers( 1, &tile_vbo );
  76
  77         float quad_mesh[] =
  78         {
  79                 -0.5f, 0.f, -0.5f,
  80                 -0.5f, 0.f, 0.5f,
  81                  0.5f, 0.f, 0.5f,
  82                 -0.5f, 0.f, -0.5f,
  83                  0.5f, 0.f, 0.5f,
  84                  0.5f, 0.f, -0.5f
  85         };
  86
  87         glBindVertexArray( tile_vao );
  88         glBindBuffer( GL_ARRAY_BUFFER, tile_vbo );
  89         glBufferData
  90         (
  91                 GL_ARRAY_BUFFER,
  92                 sizeof( quad_mesh ),
  93                 quad_mesh,
  94                 GL_STATIC_DRAW
  95         );
  96
  97         glVertexAttribPointer( 0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0 );
  98         glEnableVertexAttribArray( 0 );
  99
 100         VG_CHECK_GL();
 101 }
 102
 103 void vg_free(void)
 104 {
 105
 106 }
 107
 108 void vg_ui(void)
 109 {
 110
 111 }