nkeynes@1130: /**
nkeynes@1130:  * $Id$
nkeynes@1130:  *
nkeynes@1130:  * Assorted shader definitions (optionally) used by the PVR2 rendering
nkeynes@1130:  * engine.
nkeynes@1130:  * 
nkeynes@1130:  * This file is preprocessed by genglsl to produce shaders.c and shaders.h.
nkeynes@1130:  *
nkeynes@1130:  * Copyright (c) 2007-2010 Nathan Keynes.
nkeynes@1130:  *
nkeynes@1130:  * This program is free software; you can redistribute it and/or modify
nkeynes@1130:  * it under the terms of the GNU General Public License as published by
nkeynes@1130:  * the Free Software Foundation; either version 2 of the License, or
nkeynes@1130:  * (at your option) any later version.
nkeynes@1130:  *
nkeynes@1130:  * This program is distributed in the hope that it will be useful,
nkeynes@1130:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
nkeynes@1130:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nkeynes@1130:  * GNU General Public License for more details.
nkeynes@1130:  */
nkeynes@1130: 
nkeynes@1140: /**
nkeynes@1140:  * Quick reference for predefined variables
nkeynes@1140:  
nkeynes@1140:  * Vertex shader input variables:
nkeynes@1140:  *   vec4 gl_Color;
nkeynes@1140:  *   vec4 gl_SecondaryColor;
nkeynes@1140:  *   vec3 gl_Normal;
nkeynes@1140:  *   vec4 gl_Vertex;
nkeynes@1140:  *   vec4 gl_MultiTexCoord0;
nkeynes@1140:  *   vec4 gl_MultiTexCoord1; 
nkeynes@1140:  *   vec4 gl_MultiTexCoord2;
nkeynes@1140:  *   vec4 gl_MultiTexCoord3; 
nkeynes@1140:  *   vec4 gl_MultiTexCoord4;
nkeynes@1140:  *   vec4 gl_MultiTexCoord5;
nkeynes@1140:  *   vec4 gl_MultiTexCoord6;
nkeynes@1140:  *   vec4 gl_MultiTexCoord7;
nkeynes@1140:  *   float gl_FogCoord;
nkeynes@1140:  *
nkeynes@1140:  * Vertex shader output variables:
nkeynes@1140:  *   vec4 gl_Position;    // must be written to
nkeynes@1140:  *   float gl_PointSize;  // may be written to
nkeynes@1140:  *   vec4 gl_ClipVertex;  // may be written to
nkeynes@1140:  *   varying vec4 gl_FrontColor; 
nkeynes@1140:  *   varying vec4 gl_BackColor; 
nkeynes@1140:  *   varying vec4 gl_FrontSecondaryColor; 
nkeynes@1140:  *   varying vec4 gl_BackSecondaryColor; 
nkeynes@1140:  *   varying vec4 gl_TexCoord[]; // at most will be gl_MaxTextureCoords
nkeynes@1140:  *   varying float gl_FogFragCoord;
nkeynes@1140:  *
nkeynes@1140:  * Fragment shader input variables:
nkeynes@1140:  *   varying vec4 gl_Color; 
nkeynes@1140:  *   varying vec4 gl_SecondaryColor; 
nkeynes@1140:  *   varying vec4 gl_TexCoord[]; // at most will be gl_MaxTextureCoords
nkeynes@1140:  *   varying float gl_FogFragCoord;
nkeynes@1140:  *   varying vec2 gl_PointCoord;
nkeynes@1140:  *
nkeynes@1140:  * Fragme shader output variables:
nkeynes@1140:  *   vec4 gl_FragCoord; 
nkeynes@1140:  *   bool gl_FrontFacing; 
nkeynes@1140:  *   vec4 gl_FragColor; 
nkeynes@1140:  *   vec4 gl_FragData[gl_MaxDrawBuffers]; 
nkeynes@1140:  *   float gl_FragDepth;
nkeynes@1140: 
nkeynes@1140:  */
nkeynes@1240: #include "../config.h"
nkeynes@1140: 
nkeynes@1130: #vertex DEFAULT_VERTEX_SHADER
nkeynes@1232: uniform mat4 view_matrix;
nkeynes@1232: attribute vec4 in_vertex;
nkeynes@1232: attribute vec4 in_colour;
nkeynes@1232: attribute vec4 in_colour2; /* rgb = colour, a = fog */
nkeynes@1232: attribute vec4 in_texcoord; /* uv = coord, z = palette, w = mode */
nkeynes@1232: 
nkeynes@1232: varying vec4 frag_colour;
nkeynes@1232: varying vec4 frag_colour2;
nkeynes@1232: varying vec4 frag_texcoord;
nkeynes@1130: void main()
nkeynes@1130: {
nkeynes@1232:     vec4 tmp = view_matrix * in_vertex;
nkeynes@1232:     float w = in_vertex.z;
nkeynes@1130:     gl_Position  = tmp * w;
nkeynes@1232:     frag_colour = in_colour;
nkeynes@1232:     frag_colour2 = in_colour2;
nkeynes@1232:     frag_texcoord = in_texcoord;
nkeynes@1130: }
nkeynes@1130: 
nkeynes@1130: #fragment DEFAULT_FRAGMENT_SHADER
nkeynes@1250: precision mediump float;
nkeynes@1232: uniform float alpha_ref;
nkeynes@1140: uniform sampler2D primary_texture;
nkeynes@1221: uniform sampler2D palette_texture;
nkeynes@1232: uniform vec3 fog_colour1;
nkeynes@1232: uniform vec3 fog_colour2;
nkeynes@1232: varying vec4 frag_colour;
nkeynes@1232: varying vec4 frag_colour2;
nkeynes@1232: varying vec4 frag_texcoord;
nkeynes@1140: 
nkeynes@1130: void main()
nkeynes@1130: {
nkeynes@1232: 	vec4 tex = texture2D( primary_texture, frag_texcoord.xy );
nkeynes@1232: 	if( frag_texcoord.z >= 0.0 ) {
nkeynes@1232: 	    tex = texture2D( palette_texture, vec2(frag_texcoord.z + (tex.a*0.249023), 0.5) );
nkeynes@1140: 	}
nkeynes@1140: 	/* HACK: unfortunately we have to maintain compatibility with GLSL 1.20,
nkeynes@1140: 	 * which only supports varying float. So since we're propagating texcoord
nkeynes@1140: 	 * anyway, overload the last component to indicate texture mode. 
nkeynes@1140: 	 */
nkeynes@1232:         vec3 main_colour;
nkeynes@1232: 	if( frag_texcoord.w == 0.0 ) {
nkeynes@1232:             main_colour = frag_colour.rgb * tex.rgb + frag_colour2.rgb;
nkeynes@1232: 	    gl_FragColor.a = frag_colour.a * tex.a;
nkeynes@1232: 	} else if( frag_texcoord.w >= 1.5 ) {
nkeynes@1232:             main_colour = frag_colour.rgb;
nkeynes@1232: 	    gl_FragColor.a = frag_colour.a;
nkeynes@1140: 	} else {
nkeynes@1232: 	    main_colour =  mix(frag_colour.rgb,tex.rgb,tex.a) + frag_colour2.rgb;
nkeynes@1232: 	    gl_FragColor.a = frag_colour.a;
nkeynes@1140: 	}
nkeynes@1232:         if( gl_FragColor.a < alpha_ref ) {
nkeynes@1232:             discard;
nkeynes@1232:         } else { 
nkeynes@1232:    	    if( frag_colour2.a >= 0.0 ) {
nkeynes@1232:                 gl_FragColor.rgb = mix( main_colour, fog_colour1, frag_colour2.a );
nkeynes@1232:             } else {
nkeynes@1232:                 gl_FragColor.rgb = mix( main_colour, fog_colour2, -frag_colour2.a );
nkeynes@1232:             }
nkeynes@1232:         } 
nkeynes@1130: }
nkeynes@1130: 
nkeynes@1207: #program pvr2_shader = DEFAULT_VERTEX_SHADER DEFAULT_FRAGMENT_SHADER
nkeynes@1240: 
nkeynes@1240: #ifndef HAVE_OPENGL_FIXEDFUNC
nkeynes@1240: /* In this case we also need a basic shader to actually display the output */
nkeynes@1240: #vertex BASIC_VERTEX_SHADER
nkeynes@1240: uniform mat4 view_matrix;
nkeynes@1240: attribute vec2 in_vertex;
nkeynes@1240: attribute vec4 in_colour;
nkeynes@1240: attribute vec2 in_texcoord; /* uv = coord, z = palette, w = mode */
nkeynes@1240: 
nkeynes@1240: varying vec4 frag_colour;
nkeynes@1240: varying vec2 frag_texcoord;
nkeynes@1240: void main()
nkeynes@1240: {
nkeynes@1250:     gl_Position = view_matrix * vec4(in_vertex.x,in_vertex.y,0.0,1.0);
nkeynes@1240:     frag_colour = in_colour;
nkeynes@1240:     frag_texcoord = in_texcoord;
nkeynes@1240: }
nkeynes@1240: 
nkeynes@1240: #fragment BASIC_FRAGMENT_SHADER
nkeynes@1250: precision mediump float;
nkeynes@1240: uniform sampler2D primary_texture;
nkeynes@1240: varying vec4 frag_colour;
nkeynes@1240: varying vec2 frag_texcoord;
nkeynes@1240: 
nkeynes@1240: void main()
nkeynes@1240: {
nkeynes@1240: 	vec4 tex = texture2D( primary_texture, frag_texcoord.xy );
nkeynes@1240:         gl_FragColor.rgb = mix( frag_colour.rgb, tex.rgb, frag_colour.a );
nkeynes@1240: }
nkeynes@1240: 
nkeynes@1240: #program basic_shader = BASIC_VERTEX_SHADER BASIC_FRAGMENT_SHADER
nkeynes@1240: #endif