mirror of
https://github.com/nunuhara/xsystem4.git
synced 2026-09-27 09:28:10 +03:00
kichikuou
da5ac4a26c
This adds `USE_GLES` compile-time flag. If it's defined, gfx_init() requests an OpenGL ES >=3.0 context. This also makes the following changes to make it work with OpenGL ES: - The USE_GLES flag also switches shader's #version directive, which is now provided separately from the .glsl file. - Implicit conversion between int and float is not supported in GLSL ES. - Use GL_RGB in gfx_copy_main_surface. Because main_surface is in GL_RGB format, using GL_RGBA generates GL_INVALID_OPERATION in OpenGL ES.
33 lines
1.1 KiB
GLSL
33 lines
1.1 KiB
GLSL
/* Copyright (C) 2021 kichikuou <KichikuouChrome@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://gnu.org/licenses/>.
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*/
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uniform sampler2D tex;
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uniform float alpha_mod;
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in float dist;
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in vec2 tex_coord;
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out vec4 frag_color;
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const float FOG_MAX_DIST = 12.0;
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const vec3 FOG_COLOR = vec3(0.0, 0.0, 0.0);
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void main() {
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vec4 texel = texture(tex, tex_coord);
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float fog_factor = (FOG_MAX_DIST - dist) / FOG_MAX_DIST;
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fog_factor = clamp(fog_factor, 0.3, 1.0);
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frag_color = vec4(mix(FOG_COLOR, vec3(texel), fog_factor), texel.a * alpha_mod);
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}
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