58 lines
1.2 KiB
GLSL
58 lines
1.2 KiB
GLSL
//////////////////////////////////////////////////////////////////////////////
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#ifdef VERTEX
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layout (location = 0) in vec2 a_position;
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layout (location = 1) in vec2 a_texcoord;
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out vec2 v_texcoord;
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void main()
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{
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v_texcoord = a_texcoord;
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gl_Position = vec4(a_position, 0.0f, 1.0f);
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}
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#endif
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//////////////////////////////////////////////////////////////////////////////
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#ifdef FRAGMENT
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in vec2 v_texcoord;
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out vec4 f_color;
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uniform sampler2D u_texture;
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uniform float u_powerup_timer;
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const float START_TIMER = 15.0f;
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const float START_R = 1.20f;
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const float START_GB = 0.80f;
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const float TIMER_STEPS_R = (START_R-1.0f) / START_TIMER;
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const float TIMER_STEPS_GB = (1.0f-START_GB) / START_TIMER;
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void main()
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{
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vec4 color = texture(u_texture, v_texcoord);
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float gamma = 2.2f;
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if (u_powerup_timer > 0.0f)
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{
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float timer = u_powerup_timer / 100.0f;
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vec3 tint = vec3(
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START_R - (TIMER_STEPS_R*(START_TIMER-u_powerup_timer)),
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START_GB + (TIMER_STEPS_GB*(START_TIMER-u_powerup_timer)),
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START_GB + (TIMER_STEPS_GB*(START_TIMER-u_powerup_timer)));
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color.rgb *= tint;
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}
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f_color = vec4(pow(color.rgb, vec3(1.0f/gamma)), color.a);
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}
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#endif
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//////////////////////////////////////////////////////////////////////////////
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