mirror of
https://github.com/libretro/ppsspp.git
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317 lines
10 KiB
C++
317 lines
10 KiB
C++
// Copyright (c) 2012- PPSSPP Project.
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, version 2.0 or later versions.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official git repository and contact information can be found at
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// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
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#if defined(USING_GLES2)
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#define GLSL_ES_1_0
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#else
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#define GLSL_1_3
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// SDL 1.2 on Apple does not have support for OpenGL 3 and hence needs
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// special treatment in the shader generator.
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#if defined(__APPLE__)
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#define FORCE_OPENGL_2_0
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#endif
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#endif
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#include "FragmentShaderGenerator.h"
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#include "../ge_constants.h"
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#include "../GPUState.h"
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#include <cstdio>
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#define WRITE p+=sprintf
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// #define DEBUG_SHADER
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// GL_NV_shader_framebuffer_fetch looks interesting....
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static bool IsAlphaTestTriviallyTrue() {
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int alphaTestFunc = gstate.alphatest & 7;
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int alphaTestRef = (gstate.alphatest >> 8) & 0xFF;
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switch (alphaTestFunc) {
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case GE_COMP_ALWAYS:
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return true;
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case GE_COMP_GEQUAL:
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if (alphaTestRef == 0)
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return true;
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// This breaks the trees in MotoGP, for example.
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// case GE_COMP_GREATER:
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//if (alphaTestRef == 0 && (gstate.alphaBlendEnable & 1) && gstate.getBlendFuncA() == GE_SRCBLEND_SRCALPHA && gstate.getBlendFuncB() == GE_SRCBLEND_INVSRCALPHA)
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// return true;
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case GE_COMP_LEQUAL:
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if (alphaTestRef == 255)
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return true;
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default:
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return false;
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}
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}
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static bool IsColorTestTriviallyTrue() {
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int colorTestFunc = gstate.colortest & 3;
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switch (colorTestFunc) {
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case GE_COMP_ALWAYS:
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return true;
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default:
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return false;
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}
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}
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static bool CanDoubleSrcBlendMode() {
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if (!gstate.isAlphaBlendEnabled()) {
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return false;
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}
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int funcA = gstate.getBlendFuncA();
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int funcB = gstate.getBlendFuncB();
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if (funcA != GE_SRCBLEND_DOUBLESRCALPHA) {
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funcB = funcA;
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funcA = gstate.getBlendFuncB();
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}
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if (funcA != GE_SRCBLEND_DOUBLESRCALPHA) {
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return false;
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}
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// One side should be doubled. Let's check the other side.
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// LittleBigPlanet, for example, uses 2.0 * src, 1.0 - src, which can't double.
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switch (funcB) {
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case GE_DSTBLEND_SRCALPHA:
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case GE_DSTBLEND_INVSRCALPHA:
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return false;
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default:
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return true;
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}
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}
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// Here we must take all the bits of the gstate that determine what the fragment shader will
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// look like, and concatenate them together into an ID.
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void ComputeFragmentShaderID(FragmentShaderID *id) {
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memset(&id->d[0], 0, sizeof(id->d));
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if (gstate.isModeClear()) {
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// We only need one clear shader, so let's ignore the rest of the bits.
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id->d[0] = 1;
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} else {
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int lmode = (gstate.lmode & 1) && gstate.isLightingEnabled();
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bool enableFog = gstate.isFogEnabled() && !gstate.isModeThrough();
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bool enableAlphaTest = gstate.isAlphaTestEnabled() && !IsAlphaTestTriviallyTrue();
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bool enableColorTest = gstate.isColorTestEnabled() && !IsColorTestTriviallyTrue();
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bool enableColorDoubling = (gstate.texfunc & 0x10000) != 0;
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// This isn't really correct, but it's a hack to get doubled blend modes to work more correctly.
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bool enableAlphaDoubling = CanDoubleSrcBlendMode();
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bool doTextureProjection = gstate.getUVGenMode() == 1;
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bool doTextureAlpha = (gstate.texfunc & 0x100) != 0;
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// All texfuncs except replace are the same for RGB as for RGBA with full alpha.
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if (gstate_c.textureFullAlpha && (gstate.texfunc & 0x7) != GE_TEXFUNC_REPLACE)
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doTextureAlpha = false;
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// id->d[0] |= (gstate.clearmode & 1);
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if (gstate.isTextureMapEnabled()) {
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id->d[0] |= 1 << 1;
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id->d[0] |= (gstate.texfunc & 0x7) << 2;
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id->d[0] |= (doTextureAlpha & 1) << 5; // rgb or rgba
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}
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id->d[0] |= (lmode & 1) << 7;
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id->d[0] |= gstate.isAlphaTestEnabled() << 8;
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if (enableAlphaTest)
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id->d[0] |= (gstate.alphatest & 0x7) << 9; // alpha test func
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id->d[0] |= gstate.isColorTestEnabled() << 12;
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if (enableColorTest)
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id->d[0] |= (gstate.colortest & 0x3) << 13; // color test func
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id->d[0] |= (enableFog & 1) << 15;
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id->d[0] |= (doTextureProjection & 1) << 16;
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id->d[0] |= (enableColorDoubling & 1) << 17;
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id->d[0] |= (enableAlphaDoubling & 1) << 18;
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}
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}
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// Missing: Z depth range
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// Also, logic ops etc, of course. Urgh.
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void GenerateFragmentShader(char *buffer) {
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char *p = buffer;
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#if defined(GLSL_ES_1_0)
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WRITE(p, "#version 100\n"); // GLSL ES 1.0
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WRITE(p, "precision lowp float;\n");
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#elif !defined(FORCE_OPENGL_2_0)
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WRITE(p, "#version 110\n");
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#endif
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int lmode = (gstate.lmode & 1) && gstate.isLightingEnabled();
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int doTexture = gstate.isTextureMapEnabled() && !gstate.isModeClear();
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bool enableFog = gstate.isFogEnabled() && !gstate.isModeThrough() && !gstate.isModeClear();
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bool enableAlphaTest = gstate.isAlphaTestEnabled() && !IsAlphaTestTriviallyTrue() && !gstate.isModeClear();
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bool enableColorTest = gstate.isColorTestEnabled() && !IsColorTestTriviallyTrue() && !gstate.isModeClear();
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bool enableColorDoubling = (gstate.texfunc & 0x10000) != 0;
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// This isn't really correct, but it's a hack to get doubled blend modes to work more correctly.
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bool enableAlphaDoubling = CanDoubleSrcBlendMode();
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bool doTextureProjection = gstate.getUVGenMode() == 1;
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bool doTextureAlpha = (gstate.texfunc & 0x100) != 0;
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if (gstate_c.textureFullAlpha && (gstate.texfunc & 0x7) != GE_TEXFUNC_REPLACE)
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doTextureAlpha = false;
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if (doTexture)
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WRITE(p, "uniform sampler2D tex;\n");
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if (enableAlphaTest || enableColorTest) {
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#if defined(GLSL_ES_1_0)
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WRITE(p, "uniform mediump vec4 u_alphacolorref;\n");
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#else
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WRITE(p, "uniform vec4 u_alphacolorref;\n");
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#endif
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WRITE(p, "uniform vec4 u_colormask;\n");
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}
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if (gstate.isTextureMapEnabled())
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WRITE(p, "uniform vec3 u_texenv;\n");
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WRITE(p, "varying vec4 v_color0;\n");
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if (lmode)
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WRITE(p, "varying vec3 v_color1;\n");
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if (enableFog) {
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WRITE(p, "uniform vec3 u_fogcolor;\n");
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#if defined(GLSL_ES_1_0)
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WRITE(p, "varying mediump float v_fogdepth;\n");
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#else
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WRITE(p, "varying float v_fogdepth;\n");
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#endif
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}
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if (doTexture)
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{
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if (doTextureProjection)
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WRITE(p, "varying vec3 v_texcoord;\n");
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else
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WRITE(p, "varying vec2 v_texcoord;\n");
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}
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if (enableAlphaTest) {
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WRITE(p, "float roundAndScaleTo255f(in float x) { return floor(x * 255.0 + 0.5); }\n");
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}
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if (enableColorTest) {
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WRITE(p, "vec3 roundAndScaleTo255v(in vec3 x) { return floor(x * 255.0 + 0.5); }\n");
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}
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WRITE(p, "void main() {\n");
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if (gstate.isModeClear()) {
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// Clear mode does not allow any fancy shading.
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WRITE(p, " gl_FragColor = v_color0;\n");
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} else {
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const char *secondary = "";
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// Secondary color for specular on top of texture
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if (lmode) {
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WRITE(p, " vec4 s = vec4(v_color1, 0.0);\n");
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secondary = " + s";
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} else {
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secondary = "";
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}
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if (gstate.isTextureMapEnabled()) {
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if (doTextureProjection) {
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WRITE(p, " vec4 t = texture2DProj(tex, v_texcoord);\n");
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} else {
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WRITE(p, " vec4 t = texture2D(tex, v_texcoord);\n");
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}
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WRITE(p, " vec4 p = v_color0;\n");
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if (doTextureAlpha) { // texfmt == RGBA
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switch (gstate.texfunc & 0x7) {
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case GE_TEXFUNC_MODULATE:
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WRITE(p, " vec4 v = p * t%s;\n", secondary); break;
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case GE_TEXFUNC_DECAL:
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WRITE(p, " vec4 v = vec4(mix(p.rgb, t.rgb, t.a), p.a)%s;\n", secondary); break;
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case GE_TEXFUNC_BLEND:
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WRITE(p, " vec4 v = vec4(mix(p.rgb, u_texenv.rgb, t.rgb), p.a * t.a)%s;\n", secondary); break;
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case GE_TEXFUNC_REPLACE:
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WRITE(p, " vec4 v = t%s;\n", secondary); break;
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case GE_TEXFUNC_ADD:
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WRITE(p, " vec4 v = vec4(p.rgb + t.rgb, p.a * t.a)%s;\n", secondary); break;
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default:
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WRITE(p, " vec4 v = p;\n"); break;
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}
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} else { // texfmt == RGB
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switch (gstate.texfunc & 0x7) {
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case GE_TEXFUNC_MODULATE:
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WRITE(p, " vec4 v = vec4(t.rgb * p.rgb, p.a)%s;\n", secondary); break;
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case GE_TEXFUNC_DECAL:
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WRITE(p, " vec4 v = vec4(t.rgb, p.a)%s;\n", secondary); break;
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case GE_TEXFUNC_BLEND:
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WRITE(p, " vec4 v = vec4(mix(p.rgb, u_texenv.rgb, t.rgb), p.a)%s;\n", secondary); break;
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case GE_TEXFUNC_REPLACE:
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WRITE(p, " vec4 v = vec4(t.rgb, p.a)%s;\n", secondary); break;
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case GE_TEXFUNC_ADD:
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WRITE(p, " vec4 v = vec4(p.rgb + t.rgb, p.a)%s;\n", secondary); break;
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default:
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WRITE(p, " vec4 v = p;\n"); break;
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}
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}
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} else {
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// No texture mapping
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WRITE(p, " vec4 v = v_color0 %s;\n", secondary);
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}
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if (enableAlphaTest) {
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int alphaTestFunc = gstate.alphatest & 7;
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const char *alphaTestFuncs[] = { "#", "#", " != ", " == ", " >= ", " > ", " <= ", " < " }; // never/always don't make sense
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if (alphaTestFuncs[alphaTestFunc][0] != '#') {
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WRITE(p, " if (roundAndScaleTo255f(v.a) %s u_alphacolorref.a) discard;\n", alphaTestFuncs[alphaTestFunc]);
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}
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}
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// TODO: Before or after the color test?
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if (enableColorDoubling && enableAlphaDoubling) {
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WRITE(p, " v = v * 2.0;\n");
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} else if (enableColorDoubling) {
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WRITE(p, " v.rgb = v.rgb * 2.0;\n");
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} else if (enableAlphaDoubling) {
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WRITE(p, " v.a = v.a * 2.0;\n");
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}
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if (enableColorTest) {
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int colorTestFunc = gstate.colortest & 3;
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const char *colorTestFuncs[] = { "#", "#", " != ", " == " }; // never/always don't make sense
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int colorTestMask = gstate.colormask;
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if (colorTestFuncs[colorTestFunc][0] != '#') {
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WRITE(p, "if (roundAndScaleTo255v(v.rgb) %s u_alphacolorref.rgb) discard;\n", colorTestFuncs[colorTestFunc]);
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}
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}
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if (enableFog) {
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WRITE(p, " float fogCoef = clamp(v_fogdepth, 0.0, 1.0);\n");
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WRITE(p, " gl_FragColor = mix(vec4(u_fogcolor, v.a), v, fogCoef);\n");
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// WRITE(p, " v.x = v_depth;\n");
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} else {
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WRITE(p, " gl_FragColor = v;\n");
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}
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}
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#ifdef DEBUG_SHADER
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if (doTexture) {
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WRITE(p, " gl_FragColor = texture2D(tex, v_texcoord.xy);\n");
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WRITE(p, " gl_FragColor += vec4(0.3,0,0.3,0.3);\n");
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} else {
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WRITE(p, " gl_FragColor = vec4(1,0,1,1);\n");
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}
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#endif
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WRITE(p, "}\n");
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}
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