mirror of
https://github.com/RetroDECK/Supermodel.git
synced 2024-11-23 06:15:37 +00:00
413 lines
17 KiB
C
413 lines
17 KiB
C
/**
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** Supermodel
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** A Sega Model 3 Arcade Emulator.
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** Copyright 2011 Bart Trzynadlowski, Nik Henson
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**
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** This file is part of Supermodel.
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**
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** Supermodel is free software: you can redistribute it and/or modify it under
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** the terms of the GNU General Public License as published by the Free
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** Software Foundation, either version 3 of the License, or (at your option)
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** any later version.
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**
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** Supermodel is distributed in the hope that it will be useful, but WITHOUT
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** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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** FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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** more details.
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**
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** You should have received a copy of the GNU General Public License along
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** with Supermodel. If not, see <http://www.gnu.org/licenses/>.
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**/
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/*
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* Shaders3D.h
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*
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* Header file containing the 3D vertex and fragment shaders.
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*/
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#ifndef INCLUDED_SHADERS3D_H
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#define INCLUDED_SHADERS3D_H
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// Vertex shader
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static const char vertexShaderSource[] =
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{
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"/**\n"
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" ** Supermodel\n"
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" ** A Sega Model 3 Arcade Emulator.\n"
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" ** Copyright 2011 Bart Trzynadlowski, Nik Henson \n"
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" **\n"
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" ** This file is part of Supermodel.\n"
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" **\n"
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" ** Supermodel is free software: you can redistribute it and/or modify it under\n"
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" ** the terms of the GNU General Public License as published by the Free \n"
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" ** Software Foundation, either version 3 of the License, or (at your option)\n"
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" ** any later version.\n"
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" **\n"
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" ** Supermodel is distributed in the hope that it will be useful, but WITHOUT\n"
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" ** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or\n"
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" ** FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for\n"
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" ** more details.\n"
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" **\n"
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" ** You should have received a copy of the GNU General Public License along\n"
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" ** with Supermodel. If not, see <http://www.gnu.org/licenses/>.\n"
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" **/\n"
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" \n"
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"/*\n"
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" * Vertex.glsl\n"
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" *\n"
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" * Vertex shader for 3D rendering.\n"
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" */\n"
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" \n"
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"#version 120\n"
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"\n"
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"// Global uniforms\n"
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"uniform mat4\tmodelViewMatrix;\t// model -> view space matrix\n"
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"uniform mat4\tprojectionMatrix;\t// view space -> screen space matrix\n"
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"uniform vec3\tlighting[2];\t\t// lighting state (lighting[0] = sun direction, lighting[1].x,y = diffuse, ambient intensities from 0-1.0)\n"
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"uniform vec4\tspotEllipse;\t\t// spotlight ellipse position: .x=X position (normalized device coordinates), .y=Y position, .z=half-width, .w=half-height)\n"
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"uniform vec2\tspotRange;\t\t\t// spotlight Z range: .x=start (viewspace coordinates), .y=limit\n"
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"uniform vec3\tspotColor;\t\t\t// spotlight RGB color\n"
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"\n"
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"// Custom vertex attributes\n"
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"attribute vec4\tsubTexture;\t\t// .x=texture X, .y=texture Y, .z=texture width, .w=texture height (all in texels)\n"
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"attribute vec4\ttexParams;\t\t// .x=texture enable (if 1, else 0), .y=use transparency (if >=0), .z=U wrap mode (1=mirror, 0=repeat), .w=V wrap mode\n"
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"attribute float\ttexFormat;\t\t// T1RGB5 contour texture (if > 0)\n"
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"attribute float\ttransLevel;\t\t// translucence level, 0.0 (transparent) to 1.0 (opaque). if less than 1.0, replace alpha value\n"
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"attribute float\tlightEnable;\t// lighting enabled (1.0) or luminous (0.0), drawn at full intensity\n"
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"attribute float\tshininess;\t\t// specular shininess (if >= 0.0) or disable specular lighting (negative)\n"
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"attribute float\tfogIntensity;\t// fog intensity (1.0, full fog effect, 0.0, no fog) \n"
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"\n"
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"// Custom outputs to fragment shader\n"
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"varying vec4\tfsSubTexture;\n"
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"varying vec4\tfsTexParams;\n"
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"varying float\tfsTexFormat;\n"
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"varying float\tfsTransLevel;\n"
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"varying vec3\tfsLightIntensity;\t// total light intensity for this vertex\n"
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"varying float\tfsSpecularTerm;\t\t// specular light term (additive)\n"
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"varying float\tfsFogFactor;\t\t// fog factor\n"
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"varying float\tfsViewZ;\n"
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"\n"
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"// Gets the 3x3 matrix out of a 4x4 (because mat3(mat4matrix) does not work on ATI!)\n"
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"mat3 GetLinearPart( mat4 m )\n"
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"{\n"
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"\tmat3 result;\n"
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"\t\n"
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"\tresult[0][0] = m[0][0]; \n"
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"\tresult[0][1] = m[0][1]; \n"
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"\tresult[0][2] = m[0][2]; \n"
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"\n"
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"\tresult[1][0] = m[1][0]; \n"
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"\tresult[1][1] = m[1][1]; \n"
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"\tresult[1][2] = m[1][2]; \n"
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"\t\n"
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"\tresult[2][0] = m[2][0]; \n"
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"\tresult[2][1] = m[2][1]; \n"
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"\tresult[2][2] = m[2][2]; \n"
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"\t\n"
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"\treturn result;\n"
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"}\n"
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"\n"
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"void main(void)\n"
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"{\n"
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"\tvec3\tviewVertex;\t\t// vertex coordinates in view space\n"
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"\tvec3\tviewNormal;\t\t// vertex normal in view space\n"
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"\tvec3\tsunVector;\t\t// sun lighting vector (as reflecting away from vertex)\n"
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"\tfloat\tsunFactor;\t\t// sun light projection along vertex normal (0.0 to 1.0)\n"
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"\tvec3\thalfway;\n"
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"\tfloat\tspecFactor;\n"
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"\t\n"
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"\t// Transform vertex\n"
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"\tgl_Position = projectionMatrix * modelViewMatrix * gl_Vertex;\n"
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"\tviewVertex = vec3(modelViewMatrix * gl_Vertex);\t\n"
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"\t\n"
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"\t/*\n"
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"\t * Modulation\n"
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"\t *\n"
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" \t * Polygon color serves as material color (modulating the light intensity)\n"
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"\t * for textured polygons. The fragment shader will ignore (overwrite) the\n"
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"\t * the color passed to it if the fragment is textured. \n"
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"\t *\n"
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"\t * Untextured fragments must be set to the polygon color and the light\n"
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"\t * intensity is initialized to 1.0 here. Alpha must be set to 1.0 because\n"
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"\t * the fragment shader multiplies it by the polygon translucency setting. \n"
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"\t *\n"
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"\t * TO-DO: Does OpenGL set alpha to 1.0 by default if no alpha is specified\n"
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"\t * for the vertex? If so, we can remove that line from here.\n"
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"\t */\n"
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"\n"
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"\tgl_FrontColor = gl_Color;\t// untextured polygons will use this\n"
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"\tgl_FrontColor.a = 1.0;\t\n"
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"\tfsLightIntensity = vec3(1.0,1.0,1.0);\n"
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"\tif (texParams.x > 0.5)\t\t// textured\n"
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"\t\tfsLightIntensity *= gl_Color.rgb;\n"
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"\t\t\n"
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"\t/*\n"
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" \t * Sun Light\n"
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"\t *\n"
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"\t * Parallel light source and ambient lighting are only applied for non-\n"
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"\t * luminous polygons.\n"
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" \t */\n"
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"\tfsSpecularTerm = 0.0;\n"
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" \tif (lightEnable > 0.5)\t// not luminous\n"
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"\t{\n"
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"\t\t// Normal -> view space\n"
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"\t\tviewNormal = normalize(GetLinearPart(modelViewMatrix)*gl_Normal);\n"
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"\n"
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"\t\t// Real3D -> OpenGL view space convention (TO-DO: do this outside of shader)\n"
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"\t\tsunVector = lighting[0]*vec3(1.0,-1.0,-1.0);\n"
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"\t\t\n"
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"\t\t// Compute diffuse factor for sunlight\n"
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"\t\tsunFactor = max(dot(sunVector,viewNormal),0.0);\n"
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"\t\t\n"
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"\t\t// Total light intensity: sum of all components\n"
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"\t\tfsLightIntensity *= (sunFactor*lighting[1].x+lighting[1].y);\n"
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"\t\t\n"
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"\t\t/*\n"
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"\t\t * Specular Lighting\n"
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"\t\t *\n"
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"\t\t * The specular term is treated similarly to the \"separate specular\n"
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"\t\t * color\" functionality of OpenGL: it is added as a highlight in the\n"
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"\t\t * fragment shader. This allows even black textures to be lit.\n"
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"\t\t *\n"
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"\t\t * TO-DO: Ambient intensity viewport parameter is known but what about\n"
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"\t\t * the intensity of the specular term? Always applied with full \n"
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"\t\t * intensity here but this is unlikely to be correct.\n"
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"\t\t */\n"
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" \t\tif (shininess >= 0.0)\n"
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" \t\t{\n"
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" \t\t\t// Standard specular lighting equation\n"
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" \t\t\tvec3 V = normalize(-viewVertex);\n"
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" \t\t\tvec3 H = normalize(sunVector+V);\t// halfway vector\n"
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" \t\t\tfloat s = max(10,64-shininess);\t\t// seems to look nice, but probably not correct\n"
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" \t\t\tfsSpecularTerm = pow(max(dot(viewNormal,H),0),s);\n"
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" \t\t\tif (sunFactor <= 0) fsSpecularTerm = 0;\n"
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" \t\t\t\n"
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" \t\t\t// Faster approximation \t\t\t\n"
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" \t\t\t//float temp = max(dot(viewNormal,H),0);\n"
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" \t\t\t//float s = 64-shininess;\n"
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" \t\t\t//fsSpecularTerm = temp/(s-temp*s+temp);\n"
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" \t\t\t\n"
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" \t\t\t// Phong formula\n"
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" \t\t\t//vec3 R = normalize(2*dot(sunVector,viewNormal)*viewNormal - sunVector);\n"
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" \t\t\t//vec3 V = normalize(-viewVertex);\n"
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" \t\t\t//float s = max(2,64-shininess);\n"
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" \t\t\t//fsSpecularTerm = pow(max(dot(R,V),0),s);\n"
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" \t\t}\n"
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"\t}\n"
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"\t\n"
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"\t// Fog\n"
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"\tfloat z = length(viewVertex);\n"
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"\tfsFogFactor = clamp(1.0-fogIntensity*(gl_Fog.start+z*gl_Fog.density), 0.0, 1.0);\n"
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"\n"
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"\t// Pass viewspace Z coordinate (for spotlight)\n"
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"\tfsViewZ = -viewVertex.z;\t// convert Z from GL->Real3D convention (want +Z to be further into screen)\n"
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"\n"
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"\t// Pass remaining parameters to fragment shader\n"
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"\tgl_TexCoord[0] = gl_MultiTexCoord0;\n"
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"\tfsSubTexture = subTexture;\n"
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"\tfsTexParams = texParams;\n"
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"\tfsTransLevel = transLevel;\n"
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"\tfsTexFormat = texFormat;\n"
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"}\n"
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};
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// Fragment shader
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static const char fragmentShaderSource[] =
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{
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"/**\n"
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" ** Supermodel\n"
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" ** A Sega Model 3 Arcade Emulator.\n"
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" ** Copyright 2011 Bart Trzynadlowski, Nik Henson \n"
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" **\n"
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" ** This file is part of Supermodel.\n"
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" **\n"
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" ** Supermodel is free software: you can redistribute it and/or modify it under\n"
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" ** the terms of the GNU General Public License as published by the Free \n"
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" ** Software Foundation, either version 3 of the License, or (at your option)\n"
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" ** any later version.\n"
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" **\n"
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" ** Supermodel is distributed in the hope that it will be useful, but WITHOUT\n"
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" ** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or\n"
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" ** FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for\n"
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" ** more details.\n"
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" **\n"
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" ** You should have received a copy of the GNU General Public License along\n"
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" ** with Supermodel. If not, see <http://www.gnu.org/licenses/>.\n"
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" **/\n"
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" \n"
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"/*\n"
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" * Fragment.glsl\n"
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" *\n"
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" * Fragment shader for 3D rendering.\n"
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" */\n"
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"\n"
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"#version 120\n"
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"\n"
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"// Global uniforms\n"
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"uniform sampler2D\ttextureMap;\t\t// complete texture map, 2048x2048 texels\n"
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"uniform vec4\tspotEllipse;\t\t// spotlight ellipse position: .x=X position (screen coordinates), .y=Y position, .z=half-width, .w=half-height)\n"
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"uniform vec2\tspotRange;\t\t\t// spotlight Z range: .x=start (viewspace coordinates), .y=limit\n"
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"uniform vec3\tspotColor;\t\t\t// spotlight RGB color\n"
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"uniform vec3\tlighting[2];\t\t// lighting state (lighting[0] = sun direction, lighting[1].x,y = diffuse, ambient intensities from 0-1.0)\n"
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"\n"
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"// Inputs from vertex shader \n"
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"varying vec4\t\tfsSubTexture;\t// .x=texture X, .y=texture Y, .z=texture width, .w=texture height (all in texels)\n"
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"varying vec4\t\tfsTexParams;\t// .x=texture enable (if 1, else 0), .y=use transparency (if > 0), .z=U wrap mode (1=mirror, 0=repeat), .w=V wrap mode\n"
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"varying float\t\tfsTexFormat;\t// T1RGB5 contour texture (if > 0)\n"
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"varying float\t\tfsTransLevel;\t// translucence level, 0.0 (transparent) to 1.0 (opaque)\n"
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"varying vec3\t\tfsLightIntensity;\t// lighting intensity \n"
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"varying float\t\tfsSpecularTerm;\t// specular highlight\n"
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"varying float\t\tfsFogFactor;\t// fog factor\n"
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"varying float\t\tfsViewZ;\t\t// Z distance to fragment from viewpoint at origin\n"
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"\n"
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"/*\n"
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" * WrapTexelCoords():\n"
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" *\n"
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" * Computes the normalized OpenGL S,T coordinates within the 2048x2048 texture\n"
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" * sheet, taking into account wrapping behavior.\n"
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" *\n"
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" * Computing normalized OpenGL texture coordinates (0 to 1) within the \n"
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" * Real3D texture sheet:\n"
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" *\n"
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" * If the texture is not mirrored, we simply have to clamp the\n"
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" * coordinates to fit within the texture dimensions, add the texture\n"
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" * X, Y position to select the appropriate one, and normalize by 2048\n"
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" * (the dimensions of the Real3D texture sheet).\n"
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" *\n"
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" *\t\t= [(u,v)%(w,h)+(x,y)]/(2048,2048)\n"
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" *\n"
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" * If mirroring is enabled, textures are mirrored every odd multiple of\n"
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" * the original texture. To detect whether we are in an odd multiple, \n"
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" * simply divide the coordinate by the texture dimension and check \n"
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" * whether the result is odd. Then, clamp the coordinates as before but\n"
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" * subtract from the last texel to mirror them:\n"
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" *\n"
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" * \t\t= [M*((w-1,h-1)-(u,v)%(w,h)) + (1-M)*(u,v)%(w,h) + (x,y)]/(2048,2048)\n"
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" *\t\twhere M is 1.0 if the texture must be mirrored.\n"
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" *\n"
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" * As an optimization, this function computes TWO texture coordinates\n"
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" * simultaneously. The first is texCoord.xy, the second is in .zw. The other\n"
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" * parameters must have .xy = .zw.\n"
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" */\n"
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"vec4 WrapTexelCoords(vec4 texCoord, vec4 texOffset, vec4 texSize, vec4 mirrorEnable)\n"
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"{\n"
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"\tvec4\tclampedCoord, mirror, glTexCoord;\n"
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"\t\n"
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"\tclampedCoord = mod(texCoord,texSize);\t\t\t\t\t\t// clamp coordinates to within texture size\n"
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"\tmirror = mirrorEnable * mod(floor(texCoord/texSize),2.0);\t// whether this texel needs to be mirrored\n"
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"\n"
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"\tglTexCoord = (\tmirror*(texSize-clampedCoord) +\n"
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"\t\t\t\t\t(vec4(1.0,1.0,1.0,1.0)-mirror)*clampedCoord +\n"
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"\t\t\t\t\ttexOffset\n"
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"\t\t\t\t ) / 2048.0;\n"
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"\treturn glTexCoord;\n"
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"}\n"
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"\n"
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"/*\n"
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" * main():\n"
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" *\n"
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" * Fragment shader entry point.\n"
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" */\n"
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"\n"
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"void main(void)\n"
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"{\t\n"
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"\tvec4\tuv_top, uv_bot, c[4];\n"
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"\tvec2\tr;\n"
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"\tvec4\tfragColor;\n"
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"\tvec2\tellipse;\n"
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"\tvec3\tlightIntensity;\n"
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"\tfloat\tinsideSpot;\n"
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"\tint\t\tx;\n"
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"\t\n"
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"\t// Get polygon color for untextured polygons (textured polygons will overwrite)\n"
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"\tif (fsTexParams.x < 0.5)\n"
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"\t\tfragColor = gl_Color;\t\t\n"
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"\telse\n"
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"\t// Textured polygons: set fragment color to texel value\n"
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"\t{\t\t\t\n"
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"\t\t/*\n"
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"\t\t * Bilinear Filtering\n"
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"\t\t *\n"
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"\t\t * In order to get this working on ATI, the number of operations is\n"
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"\t\t * reduced by putting everything into vec4s. uv_top holds the UV \n"
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"\t\t * coordinates for the top two texels (.xy=left, .zw=right) and uv_bot\n"
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"\t\t * is for the lower two.\n"
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"\t\t */\n"
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"\n"
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"\t\t// Compute fractional blending factor, r, and lower left corner of texel 0\n"
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"\t\tuv_bot.xy = gl_TexCoord[0].st-vec2(0.5,0.5);\t// move into the lower left blending texel \n"
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"\t\tr = uv_bot.xy-floor(uv_bot.xy);\t\t\t\t\t// fractional part\n"
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"\t\tuv_bot.xy = floor(uv_bot.xy);\t\t\t\t\t// integral part\n"
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"\t\t\n"
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"\t\t// Compute texel coordinates\n"
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"\t\tuv_bot.xy += vec2(0.5,0.5);\t// offset to center of pixel (should not be needed but it fixes a lot of glitches, esp. on Nvidia)\n"
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"\t\tuv_bot.zw = uv_bot.xy + vec2(1.0,0.0);\t\t\t// compute coordinates of the other three neighbors\n"
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"\t\tuv_top = uv_bot + vec4(0.0,1.0,0.0,1.0);\n"
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"\n"
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"\t\t// Compute the properly wrapped texel coordinates\n"
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"\t\tuv_top = WrapTexelCoords(uv_top,vec4(fsSubTexture.xy,fsSubTexture.xy),vec4(fsSubTexture.zw,fsSubTexture.zw), vec4(fsTexParams.zw,fsTexParams.zw));\n"
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"\t\tuv_bot = WrapTexelCoords(uv_bot,vec4(fsSubTexture.xy,fsSubTexture.xy),vec4(fsSubTexture.zw,fsSubTexture.zw), vec4(fsTexParams.zw,fsTexParams.zw));\n"
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"\n"
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"\t\t// Fetch the texels\n"
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"\t\tc[0]=texture2D(textureMap,uv_bot.xy);\t// bottom-left (base texel)\n"
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"\t\tc[1]=texture2D(textureMap,uv_bot.zw);\t// bottom-right\n"
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"\t\tc[2]=texture2D(textureMap,uv_top.xy);\t// top-left\n"
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"\t\tc[3]=texture2D(textureMap,uv_top.zw);\t// top-right\t\t\n"
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"\n"
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"\t\t// Interpolate texels and blend result with material color to determine final (unlit) fragment color\n"
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"\t\t// fragColor = (c[0]*(1.0-r.s)*(1.0-r.t) + c[1]*r.s*(1.0-r.t) + c[2]*(1.0-r.s)*r.t + c[3]*r.s*r.t);\n"
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"\t\t// Faster method:\n"
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"\t\tc[0] += (c[1]-c[0])*r.s;\t\t\t// 2 alu\n"
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"\t\tc[2] += (c[3]-c[2])*r.s;\t\t\t// 2 alu\n"
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"\t\tfragColor = c[0]+(c[2]-c[0])*r.t;\t//2 alu\n"
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"\t\n"
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"\t\t/*\n"
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"\t\t * T1RGB5:\n"
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"\t\t *\n"
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"\t\t * The transparency bit determines whether to discard pixels (if set).\n"
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"\t\t * What is unknown is how this bit behaves when interpolated. OpenGL\n"
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"\t\t * processes it as an alpha value, so it might concievably be blended\n"
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"\t\t * with neighbors. Here, an arbitrary threshold is chosen.\n"
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"\t\t *\n"
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"\t\t * To-do: blending could probably enabled and this would work even\n"
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"\t\t * better with a hard threshold.\n"
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"\t\t *\n"
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"\t\t * Countour processing also seems to be enabled for RGBA4 textures.\n"
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"\t\t * When the alpha value is 0.0 (or close), pixels are discarded \n"
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"\t\t * entirely.\n"
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"\t\t */\n"
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"\t\tif (fsTexParams.y > 0.5)\t// contour processing enabled\n"
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"\t\t{\n"
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"\t\t\tif (fragColor.a < 0.01)\t// discard anything with alpha == 0\n"
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"\t\t\t\tdiscard;\n"
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"\t\t}\n"
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"\t\t\n"
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"\t\t// If contour texture and not discarded, force alpha to 1.0 because will later be modified by polygon translucency\n"
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"\t\tif (fsTexFormat > 0.0)\t\t// contour (T1RGB5) texture map\n"
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"\t\t\tfragColor.a = 1.0;\n"
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"\t}\n"
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"\n"
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"\t// Compute spotlight and apply lighting\n"
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"\tellipse = (gl_FragCoord.xy-spotEllipse.xy)/spotEllipse.zw;\n"
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"\tinsideSpot = dot(ellipse,ellipse);\n"
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"\tif ((insideSpot <= 1.0) && (fsViewZ>=spotRange.x) && (fsViewZ<spotRange.y))\n"
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"\t\tlightIntensity = fsLightIntensity+(1.0-insideSpot)*spotColor;\n"
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"\telse\n"
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"\t\tlightIntensity = fsLightIntensity;\n"
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"\tfragColor.rgb *= lightIntensity;\n"
|
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"\tfragColor.rgb += vec3(fsSpecularTerm,fsSpecularTerm,fsSpecularTerm);\n"
|
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"\t\n"
|
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"\t// Translucency (modulates existing alpha channel for RGBA4 texels)\n"
|
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"\tfragColor.a *= fsTransLevel;\n"
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"\n"
|
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"\t// Apply fog under the control of fog factor setting from polygon header\n"
|
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"\tfragColor.rgb = mix(gl_Fog.color.rgb, fragColor.rgb, fsFogFactor);\n"
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"\n"
|
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"\t// Store final color\n"
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"\tgl_FragColor = fragColor;\n"
|
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"}\n"
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};
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#endif // INCLUDED_SHADERS3D_H
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