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@1140: 
nkeynes@1140: 
nkeynes@1130: #vertex DEFAULT_VERTEX_SHADER
nkeynes@1130: void main()
nkeynes@1130: {
nkeynes@1130:     vec4 tmp = ftransform();
nkeynes@1130:     float w = gl_Vertex.z;
nkeynes@1130:     gl_Position  = tmp * w;
nkeynes@1130:     gl_FrontColor = gl_Color;
nkeynes@1130:     gl_FrontSecondaryColor = gl_SecondaryColor;
nkeynes@1130:     gl_TexCoord[0] = gl_MultiTexCoord0;
nkeynes@1130:     gl_FogFragCoord = gl_FogCoord;
nkeynes@1130: }
nkeynes@1130: 
nkeynes@1130: #fragment DEFAULT_FRAGMENT_SHADER
nkeynes@1140: 
nkeynes@1140: uniform sampler2D primary_texture;
nkeynes@1221: uniform sampler2D palette_texture;
nkeynes@1140: 
nkeynes@1130: void main()
nkeynes@1130: {
nkeynes@1140: 	vec4 tex = texture2D( primary_texture, gl_TexCoord[0].xy );
nkeynes@1140: 	if( gl_TexCoord[0].z >= 0.0 ) {
nkeynes@1221: 	    tex = texture2D( palette_texture, vec2(gl_TexCoord[0].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@1140: 	if( gl_TexCoord[0].w == 0.0 ) {
nkeynes@1140: 	    gl_FragColor.rgb = mix( gl_Color.rgb * tex.rgb + gl_SecondaryColor.rgb, gl_Fog.color.rgb, gl_FogFragCoord );
nkeynes@1140: 	    gl_FragColor.a = gl_Color.a * tex.a;
nkeynes@1140: 	} else if( gl_TexCoord[0].w >= 1.5 ) {
nkeynes@1140: 	    gl_FragColor.rgb = mix( gl_Color.rgb, gl_Fog.color.rgb, gl_FogFragCoord );
nkeynes@1140: 	    gl_FragColor.a = gl_Color.a;
nkeynes@1140: 	} else {
nkeynes@1140: 	    gl_FragColor.rgb = mix( mix(gl_Color.rgb,tex.rgb,tex.a) + gl_SecondaryColor.rgb, gl_Fog.color.rgb, gl_FogFragCoord);
nkeynes@1140: 	    gl_FragColor.a = gl_Color.a;
nkeynes@1140: 	}
nkeynes@1130: 	gl_FragDepth = gl_FragCoord.z;
nkeynes@1130: }
nkeynes@1130: 
nkeynes@1207: #program pvr2_shader = DEFAULT_VERTEX_SHADER DEFAULT_FRAGMENT_SHADER
nkeynes@1130: