src/table/opengl_shader.h

   1 /*
   2  * This file is part of OpenTTD.
   3  * 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.
   4  * 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.
   5  * 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/>.
   6  */
   7
   8 /** @file opengl_shader.h OpenGL shader programs. */
   9
  10 /** Vertex shader that positions a sprite on screen.. */
  11 static const char *_vertex_shader_sprite[] = {
  12         "#version 110\n",
  13         "uniform vec4 sprite;",
  14         "uniform vec2 screen;",
  15         "attribute vec2 position, colour_uv;",
  16         "varying vec2 colour_tex_uv;",
  17         "void main() {",
  18         "  vec2 size = sprite.zw / screen.xy;",
  19         "  vec2 offset = ((2.0 * sprite.xy + sprite.zw) / screen.xy - 1.0) * vec2(1.0, -1.0);",
  20         "  colour_tex_uv = colour_uv;",
  21         "  gl_Position = vec4(position * size + offset, 0.0, 1.0);",
  22         "}",
  23 };
  24
  25 /** GLSL 1.50 vertex shader that positions a sprite on screen. */
  26 static const char *_vertex_shader_sprite_150[] = {
  27         "#version 150\n",
  28         "uniform vec4 sprite;",
  29         "uniform vec2 screen;",
  30         "in vec2 position, colour_uv;",
  31         "out vec2 colour_tex_uv;",
  32         "void main() {",
  33         "  vec2 size = sprite.zw / screen.xy;",
  34         "  vec2 offset = ((2.0 * sprite.xy + sprite.zw) / screen.xy - 1.0) * vec2(1.0, -1.0);",
  35         "  colour_tex_uv = colour_uv;",
  36         "  gl_Position = vec4(position * size + offset, 0.0, 1.0);",
  37         "}",
  38 };
  39
  40 /** Fragment shader that reads the fragment colour from a 32bpp texture. */
  41 static const char *_frag_shader_direct[] = {
  42         "#version 110\n",
  43         "uniform sampler2D colour_tex;",
  44         "varying vec2 colour_tex_uv;",
  45         "void main() {",
  46         "  gl_FragData[0] = texture2D(colour_tex, colour_tex_uv);",
  47         "}",
  48 };
  49
  50 /** GLSL 1.50 fragment shader that reads the fragment colour from a 32bpp texture. */
  51 static const char *_frag_shader_direct_150[] = {
  52         "#version 150\n",
  53         "uniform sampler2D colour_tex;",
  54         "in vec2 colour_tex_uv;",
  55         "out vec4 colour;",
  56         "void main() {",
  57         "  colour = texture(colour_tex, colour_tex_uv);",
  58         "}",
  59 };
  60
  61 /** Fragment shader that performs a palette lookup to read the colour from an 8bpp texture. */
  62 static const char *_frag_shader_palette[] = {
  63         "#version 110\n",
  64         "uniform sampler2D colour_tex;",
  65         "uniform sampler1D palette;",
  66         "varying vec2 colour_tex_uv;",
  67         "void main() {",
  68         "  float idx = texture2D(colour_tex, colour_tex_uv).r;",
  69         "  gl_FragData[0] = texture1D(palette, idx);",
  70         "}",
  71 };
  72
  73 /** GLSL 1.50 fragment shader that performs a palette lookup to read the colour from an 8bpp texture. */
  74 static const char *_frag_shader_palette_150[] = {
  75         "#version 150\n",
  76         "uniform sampler2D colour_tex;",
  77         "uniform sampler1D palette;",
  78         "in vec2 colour_tex_uv;",
  79         "out vec4 colour;",
  80         "void main() {",
  81         "  float idx = texture(colour_tex, colour_tex_uv).r;",
  82         "  colour = texture(palette, idx);",
  83         "}",
  84 };
  85
  86
  87 /** Fragment shader function for remap brightness modulation. */
  88 static const char *_frag_shader_remap_func = \
  89         "float max3(vec3 v) {"
  90         "  return max(max(v.x, v.y), v.z);"
  91         "}"
  92         ""
  93         "vec3 adj_brightness(vec3 colour, float brightness) {"
  94         "  vec3 adj = colour * (brightness > 0.0 ? brightness / 0.5 : 1.0);"
  95         "  vec3 ob_vec = clamp(adj - 1.0, 0.0, 1.0);"
  96         "  float ob = (ob_vec.r + ob_vec.g + ob_vec.b) / 2.0;"
  97         ""
  98         "  return clamp(adj + ob * (1.0 - adj), 0.0, 1.0);"
  99         "}";
 100
 101 /** Fragment shader that performs a palette lookup to read the colour from an 8bpp texture. */
 102 static const char *_frag_shader_rgb_mask_blend[] = {
 103         "#version 110\n",
 104         "#extension GL_ATI_shader_texture_lod: enable\n",
 105         "#extension GL_ARB_shader_texture_lod: enable\n",
 106         "uniform sampler2D colour_tex;",
 107         "uniform sampler1D palette;",
 108         "uniform sampler2D remap_tex;",
 109         "uniform bool rgb;",
 110         "uniform float zoom;",
 111         "varying vec2 colour_tex_uv;",
 112         "",
 113         _frag_shader_remap_func,
 114         "",
 115         "void main() {",
 116         "  float idx = texture2DLod(remap_tex, colour_tex_uv, zoom).r;",
 117         "  vec4 remap_col = texture1D(palette, idx);",
 118         "  vec4 rgb_col = texture2DLod(colour_tex, colour_tex_uv, zoom);",
 119         "",
 120         "  gl_FragData[0].a = rgb ? rgb_col.a : remap_col.a;",
 121         "  gl_FragData[0].rgb = idx > 0.0 ? adj_brightness(remap_col.rgb, max3(rgb_col.rgb)) : rgb_col.rgb;",
 122         "}",
 123 };
 124
 125 /** GLSL 1.50 fragment shader that performs a palette lookup to read the colour from an 8bpp texture. */
 126 static const char *_frag_shader_rgb_mask_blend_150[] = {
 127         "#version 150\n",
 128         "uniform sampler2D colour_tex;",
 129         "uniform sampler1D palette;",
 130         "uniform sampler2D remap_tex;",
 131         "uniform float zoom;",
 132         "uniform bool rgb;",
 133         "in vec2 colour_tex_uv;",
 134         "out vec4 colour;",
 135         "",
 136         _frag_shader_remap_func,
 137         "",
 138         "void main() {",
 139         "  float idx = textureLod(remap_tex, colour_tex_uv, zoom).r;",
 140         "  vec4 remap_col = texture(palette, idx);",
 141         "  vec4 rgb_col = textureLod(colour_tex, colour_tex_uv, zoom);",
 142         "",
 143         "  colour.a = rgb ? rgb_col.a : remap_col.a;",
 144         "  colour.rgb = idx > 0.0 ? adj_brightness(remap_col.rgb, max3(rgb_col.rgb)) : rgb_col.rgb;",
 145         "}",
 146 };
 147
 148 /** Fragment shader that performs a palette lookup to read the colour from a sprite texture. */
 149 static const char *_frag_shader_sprite_blend[] = {
 150         "#version 110\n",
 151         "#extension GL_ATI_shader_texture_lod: enable\n",
 152         "#extension GL_ARB_shader_texture_lod: enable\n",
 153         "uniform sampler2D colour_tex;",
 154         "uniform sampler1D palette;",
 155         "uniform sampler2D remap_tex;",
 156         "uniform sampler1D pal;",
 157         "uniform float zoom;",
 158         "uniform bool rgb;",
 159         "uniform bool crash;",
 160         "varying vec2 colour_tex_uv;",
 161         "",
 162         _frag_shader_remap_func,
 163         "",
 164         "void main() {",
 165         "  float idx = texture2DLod(remap_tex, colour_tex_uv, zoom).r;",
 166         "  float r = texture1D(pal, idx).r;",
 167         "  vec4 remap_col = texture1D(palette, idx);",
 168         "  vec4 rgb_col = texture2DLod(colour_tex, colour_tex_uv, zoom);",
 169         "",
 170         "  if (crash && idx == 0.0) rgb_col.rgb = vec2(dot(rgb_col.rgb, vec3(0.199325561523, 0.391342163085, 0.076004028320)), 0.0).rrr;"
 171         "  gl_FragData[0].a = rgb && (r > 0.0 || idx == 0.0) ? rgb_col.a : remap_col.a;",
 172         "  gl_FragData[0].rgb = idx > 0.0 ? adj_brightness(remap_col.rgb, max3(rgb_col.rgb)) : rgb_col.rgb;",
 173         "}",
 174 };
 175
 176 /** GLSL 1.50 fragment shader that performs a palette lookup to read the colour from a sprite texture. */
 177 static const char *_frag_shader_sprite_blend_150[] = {
 178         "#version 150\n",
 179         "uniform sampler2D colour_tex;",
 180         "uniform sampler1D palette;",
 181         "uniform sampler2D remap_tex;",
 182         "uniform sampler1D pal;",
 183         "uniform float zoom;",
 184         "uniform bool rgb;",
 185         "uniform bool crash;",
 186         "in vec2 colour_tex_uv;",
 187         "out vec4 colour;",
 188         "",
 189         _frag_shader_remap_func,
 190         "",
 191         "void main() {",
 192         "  float idx =  textureLod(remap_tex, colour_tex_uv, zoom).r;"
 193         "  float r = texture(pal, idx).r;",
 194         "  vec4 remap_col = texture(palette, r);",
 195         "  vec4 rgb_col = textureLod(colour_tex, colour_tex_uv, zoom);",
 196         "",
 197         "  if (crash && idx == 0.0) rgb_col.rgb = vec2(dot(rgb_col.rgb, vec3(0.199325561523, 0.391342163085, 0.076004028320)), 0.0).rrr;"
 198         "  colour.a = rgb && (r > 0.0 || idx == 0.0) ? rgb_col.a : remap_col.a;",
 199         "  colour.rgb = idx > 0.0 ? adj_brightness(remap_col.rgb, max3(rgb_col.rgb)) : rgb_col.rgb;",
 200         "}",
 201 };