Platform and OS stability stuff

[vg.git] / src / vg / vg_loader.h

diff --git a/src/vg/vg_loader.h b/src/vg/vg_loader.h
index 0d580c2ae3ca99008d85dba04df603748e89903d..7245a29d88467eb91f1c076da6bf8c04afe073a8 100644 (file)
--- a/src/vg/vg_loader.h
+++ b/src/vg/vg_loader.h
@@ -12,6 +12,44 @@
 
 #include "common.h"
 
+static struct vg_shader _shader_loader = 
+{
+   .name = "[vg] loader",
+   .link = NULL,
+   .vs = 
+   {
+      .orig_file = NULL,
+      .static_src = ""
+      "layout (location=0) in vec2 a_co;"
+      "out vec2 aUv;"
+      "void main()"
+      "{"
+         "gl_Position = vec4(a_co*2.0-1.0,0.0,1.0);"
+         "aUv = a_co;"
+      "}"
+   },
+   .fs = 
+   {
+      .orig_file = NULL,
+      .static_src = 
+      
+      "out vec4 FragColor;"
+      "uniform float uTime;"
+      "in vec2 aUv;"
+      
+      "void main()"
+      "{"
+         "float dither=fract(dot(vec2(171.0,231.0),gl_FragCoord.xy)/71.0)-0.5;"
+         "float grad = 1.0-(aUv.y*0.5+0.5);"
+         "float fmt1 = step( 0.5, grad+dither );"
+
+         "vec3 col = 0.5+0.5*sin( uTime + aUv.xyx + vec3(0.0,2.0,4.0) );"
+
+         "FragColor = vec4(col*grad*fmt1,1.0);"
+      "}"
+   }
+};
+
 static struct vg_loader
 {
    /* Shutdown steps */
@@ -22,17 +60,43 @@ static struct vg_loader
    }
    *step_buffer;
    u32 step_count, step_cap, step_action;
+
+   GLuint vao, vbo;
 }
 vg_loader;
 
 static int vg_loader_init(void)
 {
+   float quad[] = { 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f,
+                    0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f };
+
+   glGenVertexArrays( 1, &vg_loader.vao );
+   glGenBuffers( 1, &vg_loader.vbo );
+   glBindVertexArray( vg_loader.vao );
+   glBindBuffer( GL_ARRAY_BUFFER, vg_loader.vbo );
+   glBufferData( GL_ARRAY_BUFFER, sizeof(quad), quad, GL_STATIC_DRAW );
+   glBindVertexArray( vg_loader.vao );
+   glVertexAttribPointer( 0, 2, GL_FLOAT, GL_FALSE, 
+         sizeof(float)*2, (void*)0 );
+   glEnableVertexAttribArray( 0 );
+
+   VG_CHECK_GL_ERR();
+
+   if( !vg_shader_compile( &_shader_loader ) )
+   {
+      glDeleteVertexArrays( 1, &vg_loader.vao );
+      glDeleteBuffers( 1, &vg_loader.vbo );
+      return 0;
+   }
+
    return 1;
 }
 
 static void vg_loader_free(void)
 {
    vg_info( "vg_loader_free\n" );
+   glDeleteVertexArrays( 1, &vg_loader.vao );
+   glDeleteBuffers( 1, &vg_loader.vbo );
 
    for( int i=0; i<vg_loader.step_count; i++ )
    {
@@ -93,18 +157,17 @@ static void vg_render_log(void)
 
 static void vg_loader_render(void)
 {
-   float h = vg_randf(),
-         s = 0.7f,
-         l = 0.1f, //* (0.5f+vg_fractf(vg_time*40.0)*0.5f),
-         q = l < 0.5f ? l * (1.0f + s) : l + s - l * s,
-         p = 2.0f * l - q,
-         r = hue_to_rgb( p, q, h + 1.0f/3.0f ),
-         g = hue_to_rgb( p, q, h ),
-         b = hue_to_rgb( p, q, h - 1.0f/3.0f );
-
-   glClearColor( r, g, b, 1.0f );
+   glViewport( 0,0, vg_window_x, vg_window_y );
+   glBindFramebuffer( GL_FRAMEBUFFER, 0 );
+   glClearColor( 0.0f, 0.0f, 0.0f, 1.0f );
    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 
+   glUseProgram( _shader_loader.id );
+       glUniform1f( glGetUniformLocation( _shader_loader.id, "uTime" ), vg_time );
+
+   glBindVertexArray( vg_loader.vao );
+   glDrawArrays( GL_TRIANGLES, 0, 6 );
+
    vg_render_log();
 }