opengl_shader.h

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
static const char *_vertex_shader_sprite[] = {
  "#version 110\n",
  "uniform vec4 sprite;",
  "uniform vec2 screen;",
  "attribute vec2 position, colour_uv;",
  "varying vec2 colour_tex_uv;",
  "void main() {",
  "  vec2 size = sprite.zw / screen.xy;",
  "  vec2 offset = ((2.0 * sprite.xy + sprite.zw) / screen.xy - 1.0) * vec2(1.0, -1.0);",
  "  colour_tex_uv = colour_uv;",
  "  gl_Position = vec4(position * size + offset, 0.0, 1.0);",
  "}",
};
 
static const char *_vertex_shader_sprite_150[] = {
  "#version 150\n",
  "uniform vec4 sprite;",
  "uniform vec2 screen;",
  "in vec2 position, colour_uv;",
  "out vec2 colour_tex_uv;",
  "void main() {",
  "  vec2 size = sprite.zw / screen.xy;",
  "  vec2 offset = ((2.0 * sprite.xy + sprite.zw) / screen.xy - 1.0) * vec2(1.0, -1.0);",
  "  colour_tex_uv = colour_uv;",
  "  gl_Position = vec4(position * size + offset, 0.0, 1.0);",
  "}",
};
 
static const char *_frag_shader_direct[] = {
  "#version 110\n",
  "uniform sampler2D colour_tex;",
  "varying vec2 colour_tex_uv;",
  "void main() {",
  "  gl_FragData[0] = texture2D(colour_tex, colour_tex_uv);",
  "}",
};
 
static const char *_frag_shader_direct_150[] = {
  "#version 150\n",
  "uniform sampler2D colour_tex;",
  "in vec2 colour_tex_uv;",
  "out vec4 colour;",
  "void main() {",
  "  colour = texture(colour_tex, colour_tex_uv);",
  "}",
};
 
static const char *_frag_shader_palette[] = {
  "#version 110\n",
  "uniform sampler2D colour_tex;",
  "uniform sampler1D palette;",
  "varying vec2 colour_tex_uv;",
  "void main() {",
  "  float idx = texture2D(colour_tex, colour_tex_uv).r;",
  "  gl_FragData[0] = texture1D(palette, idx);",
  "}",
};
 
static const char *_frag_shader_palette_150[] = {
  "#version 150\n",
  "uniform sampler2D colour_tex;",
  "uniform sampler1D palette;",
  "in vec2 colour_tex_uv;",
  "out vec4 colour;",
  "void main() {",
  "  float idx = texture(colour_tex, colour_tex_uv).r;",
  "  colour = texture(palette, idx);",
  "}",
};
 
 
static const char *_frag_shader_remap_func = \
  "float max3(vec3 v) {"
  "  return max(max(v.x, v.y), v.z);"
  "}"
  ""
  "vec3 adj_brightness(vec3 colour, float brightness) {"
  "  vec3 adj = colour * (brightness > 0.0 ? brightness / 0.5 : 1.0);"
  "  vec3 ob_vec = clamp(adj - 1.0, 0.0, 1.0);"
  "  float ob = (ob_vec.r + ob_vec.g + ob_vec.b) / 2.0;"
  ""
  "  return clamp(adj + ob * (1.0 - adj), 0.0, 1.0);"
  "}";
 
static const char *_frag_shader_rgb_mask_blend[] = {
  "#version 110\n",
  "#extension GL_ATI_shader_texture_lod: enable\n",
  "#extension GL_ARB_shader_texture_lod: enable\n",
  "uniform sampler2D colour_tex;",
  "uniform sampler1D palette;",
  "uniform sampler2D remap_tex;",
  "uniform bool rgb;",
  "uniform float zoom;",
  "varying vec2 colour_tex_uv;",
  "",
  _frag_shader_remap_func,
  "",
  "void main() {",
  "  float idx = texture2DLod(remap_tex, colour_tex_uv, zoom).r;",
  "  vec4 remap_col = texture1D(palette, idx);",
  "  vec4 rgb_col = texture2DLod(colour_tex, colour_tex_uv, zoom);",
  "",
  "  gl_FragData[0].a = rgb ? rgb_col.a : remap_col.a;",
  "  gl_FragData[0].rgb = idx > 0.0 ? adj_brightness(remap_col.rgb, max3(rgb_col.rgb)) : rgb_col.rgb;",
  "}",
};
 
static const char *_frag_shader_rgb_mask_blend_150[] = {
  "#version 150\n",
  "uniform sampler2D colour_tex;",
  "uniform sampler1D palette;",
  "uniform sampler2D remap_tex;",
  "uniform float zoom;",
  "uniform bool rgb;",
  "in vec2 colour_tex_uv;",
  "out vec4 colour;",
  "",
  _frag_shader_remap_func,
  "",
  "void main() {",
  "  float idx = textureLod(remap_tex, colour_tex_uv, zoom).r;",
  "  vec4 remap_col = texture(palette, idx);",
  "  vec4 rgb_col = textureLod(colour_tex, colour_tex_uv, zoom);",
  "",
  "  colour.a = rgb ? rgb_col.a : remap_col.a;",
  "  colour.rgb = idx > 0.0 ? adj_brightness(remap_col.rgb, max3(rgb_col.rgb)) : rgb_col.rgb;",
  "}",
};
 
static const char *_frag_shader_sprite_blend[] = {
  "#version 110\n",
  "#extension GL_ATI_shader_texture_lod: enable\n",
  "#extension GL_ARB_shader_texture_lod: enable\n",
  "uniform sampler2D colour_tex;",
  "uniform sampler1D palette;",
  "uniform sampler2D remap_tex;",
  "uniform sampler1D pal;",
  "uniform float zoom;",
  "uniform bool rgb;",
  "uniform bool crash;",
  "varying vec2 colour_tex_uv;",
  "",
  _frag_shader_remap_func,
  "",
  "void main() {",
  "  float idx = texture2DLod(remap_tex, colour_tex_uv, zoom).r;",
  "  float r = texture1D(pal, idx).r;",
  "  vec4 remap_col = texture1D(palette, idx);",
  "  vec4 rgb_col = texture2DLod(colour_tex, colour_tex_uv, zoom);",
  "",
  "  if (crash && idx == 0.0) rgb_col.rgb = vec2(dot(rgb_col.rgb, vec3(0.199325561523, 0.391342163085, 0.076004028320)), 0.0).rrr;"
  "  gl_FragData[0].a = rgb && (r > 0.0 || idx == 0.0) ? rgb_col.a : remap_col.a;",
  "  gl_FragData[0].rgb = idx > 0.0 ? adj_brightness(remap_col.rgb, max3(rgb_col.rgb)) : rgb_col.rgb;",
  "}",
};
 
static const char *_frag_shader_sprite_blend_150[] = {
  "#version 150\n",
  "uniform sampler2D colour_tex;",
  "uniform sampler1D palette;",
  "uniform sampler2D remap_tex;",
  "uniform sampler1D pal;",
  "uniform float zoom;",
  "uniform bool rgb;",
  "uniform bool crash;",
  "in vec2 colour_tex_uv;",
  "out vec4 colour;",
  "",
  _frag_shader_remap_func,
  "",
  "void main() {",
  "  float idx =  textureLod(remap_tex, colour_tex_uv, zoom).r;"
  "  float r = texture(pal, idx).r;",
  "  vec4 remap_col = texture(palette, r);",
  "  vec4 rgb_col = textureLod(colour_tex, colour_tex_uv, zoom);",
  "",
  "  if (crash && idx == 0.0) rgb_col.rgb = vec2(dot(rgb_col.rgb, vec3(0.199325561523, 0.391342163085, 0.076004028320)), 0.0).rrr;"
  "  colour.a = rgb && (r > 0.0 || idx == 0.0) ? rgb_col.a : remap_col.a;",
  "  colour.rgb = idx > 0.0 ? adj_brightness(remap_col.rgb, max3(rgb_col.rgb)) : rgb_col.rgb;",
  "}",
};