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025e478d2fa6a02b60e789a1e2014b2bfca4e4b7
ppsspp/GPU/Vulkan/VertexShaderGeneratorVulkan.cpp
T
Henrik Rydgård c1f0e981a3 Throw in very minor fix (apply readonly to buffer used in tesselation). 
Validation layer seems buggy though as it still complains that we haven't
enabled the feature vertexPipelineStoresAndAtomics
2018-09-18 23:53:16 +02:00

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// Copyright (c) 2012- PPSSPP Project.
// This program 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 2.0 or later versions.
// This program 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. See the
// GNU General Public License 2.0 for more details.
// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/
// Official git repository and contact information can be found at
// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
#include <cstdio>
#include <cstdlib>
#include <locale.h>
#include "gfx_es2/gpu_features.h"
#if defined(_WIN32) && defined(_DEBUG)
#include "Common/CommonWindows.h"
#endif
#include "base/stringutil.h"
#include "Common/Vulkan/VulkanLoader.h"
#include "Core/Config.h"
#include "GPU/ge_constants.h"
#include "GPU/GPUState.h"
#include "GPU/Common/ShaderId.h"
#include "GPU/Common/VertexDecoderCommon.h"
#include "GPU/Vulkan/VertexShaderGeneratorVulkan.h"
#include "GPU/Vulkan/PipelineManagerVulkan.h"
#include "GPU/Vulkan/ShaderManagerVulkan.h"
static const char *vulkan_glsl_preamble =
"#version 450\n"
"#extension GL_ARB_separate_shader_objects : enable\n"
"#extension GL_ARB_shading_language_420pack : enable\n\n";
// "Varying" layout - must match fragment shader
// color0 = 0
// color1 = 1
// texcoord = 2
// fog = 3
#undef WRITE
#define WRITE p+=sprintf
static const char * const boneWeightDecl[9] = {
"#ERROR#",
"layout(location = 3) in float w1;\n",
"layout(location = 3) in vec2 w1;\n",
"layout(location = 3) in vec3 w1;\n",
"layout(location = 3) in vec4 w1;\n",
"layout(location = 3) in vec4 w1;\nlayout(location = 4) in float w2;\n",
"layout(location = 3) in vec4 w1;\nlayout(location = 4) in vec2 w2;\n",
"layout(location = 3) in vec4 w1;\nlayout(location = 4) in vec3 w2;\n",
"layout(location = 3) in vec4 w1;\nlayout(location = 4) in vec4 w2;\n",
};
enum DoLightComputation {
LIGHT_OFF,
LIGHT_SHADE,
LIGHT_FULL,
};
// Depth range and viewport
//
// After the multiplication with the projection matrix, we have a 4D vector in clip space.
// In OpenGL, Z is from -1 to 1, while in D3D, Z is from 0 to 1.
// PSP appears to use the OpenGL convention. As Z is from -1 to 1, and the viewport is represented
// by a center and a scale, to find the final Z value, all we need to do is to multiply by ZScale and
// add ZCenter - these are properly scaled to directly give a Z value in [0, 65535].
//
// z = vec.z * ViewportZScale + ViewportZCenter;
//
// That will give us the final value between 0 and 65535, which we can simply floor to simulate
// the limited precision of the PSP's depth buffer. Then we convert it back:
// z = floor(z);
//
// vec.z = (z - ViewportZCenter) / ViewportZScale;
//
// Now, the regular machinery will take over and do the calculation again.
//
// All this above is for full transform mode.
// In through mode, the Z coordinate just goes straight through and there is no perspective division.
// We simulate this of course with pretty much an identity matrix. Rounding Z becomes very easy.
//
// TODO: Skip all this if we can actually get a 16-bit depth buffer along with stencil, which
// is a bit of a rare configuration, although quite common on mobile.
bool GenerateVulkanGLSLVertexShader(const VShaderID &id, char *buffer) {
char *p = buffer;
WRITE(p, "%s", vulkan_glsl_preamble);
bool highpFog = false;
bool highpTexcoord = false;
bool isModeThrough = id.Bit(VS_BIT_IS_THROUGH);
bool lmode = id.Bit(VS_BIT_LMODE);
bool doTexture = id.Bit(VS_BIT_DO_TEXTURE);
bool doTextureTransform = id.Bit(VS_BIT_DO_TEXTURE_TRANSFORM);
GETexMapMode uvGenMode = static_cast<GETexMapMode>(id.Bits(VS_BIT_UVGEN_MODE, 2));
// this is only valid for some settings of uvGenMode
GETexProjMapMode uvProjMode = static_cast<GETexProjMapMode>(id.Bits(VS_BIT_UVPROJ_MODE, 2));
bool doShadeMapping = uvGenMode == GE_TEXMAP_ENVIRONMENT_MAP;
bool doFlatShading = id.Bit(VS_BIT_FLATSHADE);
bool useHWTransform = id.Bit(VS_BIT_USE_HW_TRANSFORM);
bool hasColor = id.Bit(VS_BIT_HAS_COLOR) || !useHWTransform;
bool hasNormal = id.Bit(VS_BIT_HAS_NORMAL) && useHWTransform;
bool hasTexcoord = id.Bit(VS_BIT_HAS_TEXCOORD) || !useHWTransform;
bool enableFog = id.Bit(VS_BIT_ENABLE_FOG);
bool flipNormal = id.Bit(VS_BIT_NORM_REVERSE);
int ls0 = id.Bits(VS_BIT_LS0, 2);
int ls1 = id.Bits(VS_BIT_LS1, 2);
bool enableBones = id.Bit(VS_BIT_ENABLE_BONES);
bool enableLighting = id.Bit(VS_BIT_LIGHTING_ENABLE);
int matUpdate = id.Bits(VS_BIT_MATERIAL_UPDATE, 3);
bool doBezier = id.Bit(VS_BIT_BEZIER);
bool doSpline = id.Bit(VS_BIT_SPLINE);
bool hasColorTess = id.Bit(VS_BIT_HAS_COLOR_TESS);
bool hasTexcoordTess = id.Bit(VS_BIT_HAS_TEXCOORD_TESS);
bool flipNormalTess = id.Bit(VS_BIT_NORM_REVERSE_TESS);
WRITE(p, "\n");
WRITE(p, "layout (std140, set = 0, binding = 3) uniform baseVars {\n%s} base;\n", ub_baseStr);
if (enableLighting || doShadeMapping)
WRITE(p, "layout (std140, set = 0, binding = 4) uniform lightVars {\n%s} light;\n", ub_vs_lightsStr);
if (enableBones)
WRITE(p, "layout (std140, set = 0, binding = 5) uniform boneVars {\n%s} bone;\n", ub_vs_bonesStr);
const char *shading = doFlatShading ? "flat " : "";
DoLightComputation doLight[4] = { LIGHT_OFF, LIGHT_OFF, LIGHT_OFF, LIGHT_OFF };
if (useHWTransform) {
int shadeLight0 = doShadeMapping ? ls0 : -1;
int shadeLight1 = doShadeMapping ? ls1 : -1;
for (int i = 0; i < 4; i++) {
if (i == shadeLight0 || i == shadeLight1)
doLight[i] = LIGHT_SHADE;
if (id.Bit(VS_BIT_LIGHTING_ENABLE) && id.Bit(VS_BIT_LIGHT0_ENABLE + i))
doLight[i] = LIGHT_FULL;
}
}
int numBoneWeights = 0;
int boneWeightScale = id.Bits(VS_BIT_WEIGHT_FMTSCALE, 2);
if (enableBones) {
numBoneWeights = 1 + id.Bits(VS_BIT_BONES, 3);
WRITE(p, "%s", boneWeightDecl[numBoneWeights]);
}
if (useHWTransform)
WRITE(p, "layout (location = %d) in vec3 position;\n", (int)PspAttributeLocation::POSITION);
else
// we pass the fog coord in w
WRITE(p, "layout (location = %d) in vec4 position;\n", (int)PspAttributeLocation::POSITION);
if (useHWTransform && hasNormal)
WRITE(p, "layout (location = %d) in vec3 normal;\n", (int)PspAttributeLocation::NORMAL);
bool texcoordInVec3 = false;
if (doTexture && hasTexcoord) {
if (!useHWTransform && doTextureTransform && !isModeThrough) {
WRITE(p, "layout (location = %d) in vec3 texcoord;\n", (int)PspAttributeLocation::TEXCOORD);
texcoordInVec3 = true;
}
else
WRITE(p, "layout (location = %d) in vec2 texcoord;\n", (int)PspAttributeLocation::TEXCOORD);
}
if (hasColor) {
WRITE(p, "layout (location = %d) in vec4 color0;\n", (int)PspAttributeLocation::COLOR0);
if (lmode && !useHWTransform) // only software transform supplies color1 as vertex data
WRITE(p, "layout (location = %d) in vec3 color1;\n", (int)PspAttributeLocation::COLOR1);
}
WRITE(p, "layout (location = 1) %sout vec4 v_color0;\n", shading);
if (lmode) {
WRITE(p, "layout (location = 2) %sout vec3 v_color1;\n", shading);
}
if (doTexture) {
WRITE(p, "layout (location = 0) out vec3 v_texcoord;\n");
}
if (enableFog) {
// See the fragment shader generator
WRITE(p, "layout (location = 3) out float v_fogdepth;\n");
}
// See comment above this function (GenerateVertexShader).
if (!isModeThrough && gstate_c.Supports(GPU_ROUND_DEPTH_TO_16BIT)) {
// Apply the projection and viewport to get the Z buffer value, floor to integer, undo the viewport and projection.
WRITE(p, "\nvec4 depthRoundZVP(vec4 v) {\n");
WRITE(p, " float z = v.z / v.w;\n");
WRITE(p, " z = z * base.depthRange.x + base.depthRange.y;\n");
WRITE(p, " z = floor(z);\n");
WRITE(p, " z = (z - base.depthRange.z) * base.depthRange.w;\n");
WRITE(p, " return vec4(v.x, v.y, z * v.w, v.w);\n");
WRITE(p, "}\n\n");
}
WRITE(p, "out gl_PerVertex { vec4 gl_Position; };\n");
if (doBezier || doSpline) {
WRITE(p, "struct TessData {\n");
WRITE(p, " vec4 pos;\n");
WRITE(p, " vec4 uv;\n");
WRITE(p, " vec4 color;\n");
WRITE(p, "};");
WRITE(p, "layout (std430, set = 0, binding = 6) readonly buffer s_tess_data {\n");
WRITE(p, " TessData data[];");
WRITE(p, "} tess_data;\n");
for (int i = 2; i <= 4; i++) {
// Define 3 types vec2, vec3, vec4
WRITE(p, "vec%d tess_sample(in vec%d points[16], in vec2 weights[4]) {\n", i, i);
WRITE(p, " vec%d pos = vec%d(0);\n", i, i);
WRITE(p, " for (int i = 0; i < 4; ++i) {\n");
WRITE(p, " for (int j = 0; j < 4; ++j) {\n");
WRITE(p, " float f = weights[j].x * weights[i].y;\n");
WRITE(p, " if (f != 0)\n");
WRITE(p, " pos = pos + f * points[i * 4 + j];\n");
WRITE(p, " }\n");
WRITE(p, " }\n");
WRITE(p, " return pos;\n");
WRITE(p, "}\n");
}
if (doSpline) {
WRITE(p, "void spline_knot(ivec2 num_patches, ivec2 type, out vec2 knot[6], ivec2 patch_pos) {\n");
WRITE(p, " for (int i = 0; i < 6; ++i) {\n");
WRITE(p, " knot[i] = vec2(i + patch_pos.x - 2, i + patch_pos.y - 2);\n");
WRITE(p, " }\n");
WRITE(p, " if ((type.x & 1) != 0) {\n");
WRITE(p, " if (patch_pos.x <= 2)\n");
WRITE(p, " knot[0].x = 0;\n");
WRITE(p, " if (patch_pos.x <= 1)\n");
WRITE(p, " knot[1].x = 0;\n");
WRITE(p, " }\n");
WRITE(p, " if ((type.x & 2) != 0) {\n");
WRITE(p, " if (patch_pos.x >= (num_patches.x - 2))\n");
WRITE(p, " knot[5].x = num_patches.x;\n");
WRITE(p, " if (patch_pos.x == (num_patches.x - 1))\n");
WRITE(p, " knot[4].x = num_patches.x;\n");
WRITE(p, " }\n");
WRITE(p, " if ((type.y & 1) != 0) {\n");
WRITE(p, " if (patch_pos.y <= 2)\n");
WRITE(p, " knot[0].y = 0;\n");
WRITE(p, " if (patch_pos.y <= 1)\n");
WRITE(p, " knot[1].y = 0;\n");
WRITE(p, " }\n");
WRITE(p, " if ((type.y & 2) != 0) {\n");
WRITE(p, " if (patch_pos.y >= (num_patches.y - 2))\n");
WRITE(p, " knot[5].y = num_patches.y;\n");
WRITE(p, " if (patch_pos.y == (num_patches.y - 1))\n");
WRITE(p, " knot[4].y = num_patches.y;\n");
WRITE(p, " }\n");
WRITE(p, "}\n");
WRITE(p, "void spline_weight(vec2 t, in vec2 knot[6], out vec2 weights[4]) {\n");
// TODO: Maybe compilers could be coaxed into vectorizing this code without the above explicitly...
WRITE(p, " vec2 t0 = (t - knot[0]);\n");
WRITE(p, " vec2 t1 = (t - knot[1]);\n");
WRITE(p, " vec2 t2 = (t - knot[2]);\n");
// TODO: All our knots are integers so we should be able to get rid of these divisions (How?)
WRITE(p, " vec2 f30 = t0 / (knot[3] - knot[0]);\n");
WRITE(p, " vec2 f41 = t1 / (knot[4] - knot[1]);\n");
WRITE(p, " vec2 f52 = t2 / (knot[5] - knot[2]);\n");
WRITE(p, " vec2 f31 = t1 / (knot[3] - knot[1]);\n");
WRITE(p, " vec2 f42 = t2 / (knot[4] - knot[2]);\n");
WRITE(p, " vec2 f32 = t2 / (knot[3] - knot[2]);\n");
WRITE(p, " vec2 a = (1 - f30)*(1 - f31);\n");
WRITE(p, " vec2 b = (f31*f41);\n");
WRITE(p, " vec2 c = (1 - f41)*(1 - f42);\n");
WRITE(p, " vec2 d = (f42*f52);\n");
WRITE(p, " weights[0] = a - (a*f32);\n");
WRITE(p, " weights[1] = 1 - a - b + ((a + b + c - 1)*f32);\n");
WRITE(p, " weights[2] = b + ((1 - b - c - d)*f32);\n");
WRITE(p, " weights[3] = d*f32;\n");
WRITE(p, "}\n");
}
}
WRITE(p, "void main() {\n");
if (!useHWTransform) {
// Simple pass-through of vertex data to fragment shader
if (doTexture) {
if (texcoordInVec3) {
WRITE(p, " v_texcoord = texcoord;\n");
} else {
WRITE(p, " v_texcoord = vec3(texcoord, 1.0);\n");
}
}
if (hasColor) {
WRITE(p, " v_color0 = color0;\n");
if (lmode)
WRITE(p, " v_color1 = color1;\n");
} else {
WRITE(p, " v_color0 = base.matambientalpha;\n");
if (lmode)
WRITE(p, " v_color1 = vec3(0.0);\n");
}
if (enableFog) {
WRITE(p, " v_fogdepth = position.w;\n");
}
if (isModeThrough) {
WRITE(p, " vec4 outPos = base.proj_through_mtx * vec4(position.xyz, 1.0);\n");
} else {
// The viewport is used in this case, so need to compensate for that.
if (gstate_c.Supports(GPU_ROUND_DEPTH_TO_16BIT)) {
WRITE(p, " vec4 outPos = depthRoundZVP(base.proj_mtx * vec4(position.xyz, 1.0));\n");
} else {
WRITE(p, " vec4 outPos = base.proj_mtx * vec4(position.xyz, 1.0);\n");
}
}
} else {
// Step 1: World Transform / Skinning
if (!enableBones) {
if (doBezier || doSpline) {
WRITE(p, " vec3 _pos[16];\n");
WRITE(p, " vec2 _tex[16];\n");
WRITE(p, " vec4 _col[16];\n");
WRITE(p, " int spline_count_u = int(base.spline_counts & 0xff);\n");
WRITE(p, " int spline_count_v = int((base.spline_counts >> 8) & 0xff);\n");
WRITE(p, " int num_patches_u = %s;\n", doBezier ? "(spline_count_u - 1) / 3" : "spline_count_u - 3");
WRITE(p, " int u = int(mod(gl_InstanceIndex, num_patches_u));\n");
WRITE(p, " int v = gl_InstanceIndex / num_patches_u;\n");
WRITE(p, " ivec2 patch_pos = ivec2(u, v);\n");
WRITE(p, " for (int i = 0; i < 4; i++) {\n");
WRITE(p, " for (int j = 0; j < 4; j++) {\n");
WRITE(p, " int idx = (i + v%s) * spline_count_u + (j + u%s);\n", doBezier ? " * 3" : "", doBezier ? " * 3" : "");
WRITE(p, " _pos[i * 4 + j] = tess_data.data[idx].pos.xyz;\n");
if (doTexture && hasTexcoord && hasTexcoordTess)
WRITE(p, " _tex[i * 4 + j] = tess_data.data[idx].uv.xy;\n");
if (hasColor && hasColorTess)
WRITE(p, " _col[i * 4 + j] = tess_data.data[idx].color;\n");
WRITE(p, " }\n");
WRITE(p, " }\n");
WRITE(p, " vec2 tess_pos = position.xy;\n");
WRITE(p, " vec2 weights[4];\n");
if (doBezier) {
// Bernstein 3D
WRITE(p, " weights[0] = (1 - tess_pos) * (1 - tess_pos) * (1 - tess_pos);\n");
WRITE(p, " weights[1] = 3 * tess_pos * (1 - tess_pos) * (1 - tess_pos);\n");
WRITE(p, " weights[2] = 3 * tess_pos * tess_pos * (1 - tess_pos);\n");
WRITE(p, " weights[3] = tess_pos * tess_pos * tess_pos;\n");
} else { // Spline
WRITE(p, " ivec2 spline_num_patches = ivec2(spline_count_u - 3, spline_count_v - 3);\n");
WRITE(p, " int spline_type_u = int((base.spline_counts >> 16) & 0xff);\n");
WRITE(p, " int spline_type_v = int((base.spline_counts >> 24) & 0xff);\n");
WRITE(p, " ivec2 spline_type = ivec2(spline_type_u, spline_type_v);\n");
WRITE(p, " vec2 knots[6];\n");
WRITE(p, " spline_knot(spline_num_patches, spline_type, knots, patch_pos);\n");
WRITE(p, " spline_weight(tess_pos + patch_pos, knots, weights);\n");
}
WRITE(p, " vec3 pos = tess_sample(_pos, weights);\n");
if (doTexture && hasTexcoord) {
if (hasTexcoordTess)
WRITE(p, " vec2 tex = tess_sample(_tex, weights);\n");
else
WRITE(p, " vec2 tex = tess_pos + patch_pos;\n");
}
if (hasColor) {
if (hasColorTess)
WRITE(p, " vec4 col = tess_sample(_col, weights);\n");
else
WRITE(p, " vec4 col = tess_data.data[0].color;\n");
}
if (hasNormal) {
// Curved surface is probably always need to compute normal(not sampling from control points)
if (doBezier) {
// Bernstein derivative
WRITE(p, " vec2 bernderiv[4];\n");
WRITE(p, " bernderiv[0] = -3 * (tess_pos - 1) * (tess_pos - 1); \n");
WRITE(p, " bernderiv[1] = 9 * tess_pos * tess_pos - 12 * tess_pos + 3; \n");
WRITE(p, " bernderiv[2] = 3 * (2 - 3 * tess_pos) * tess_pos; \n");
WRITE(p, " bernderiv[3] = 3 * tess_pos * tess_pos; \n");
WRITE(p, " vec2 bernderiv_u[4];\n");
WRITE(p, " vec2 bernderiv_v[4];\n");
WRITE(p, " for (int i = 0; i < 4; i++) {\n");
WRITE(p, " bernderiv_u[i] = vec2(bernderiv[i].x, weights[i].y);\n");
WRITE(p, " bernderiv_v[i] = vec2(weights[i].x, bernderiv[i].y);\n");
WRITE(p, " }\n");
WRITE(p, " vec3 du = tess_sample(_pos, bernderiv_u);\n");
WRITE(p, " vec3 dv = tess_sample(_pos, bernderiv_v);\n");
} else { // Spline
WRITE(p, " vec2 tess_next_u = vec2(normal.x, 0);\n");
WRITE(p, " vec2 tess_next_v = vec2(0, normal.y);\n");
// Right
WRITE(p, " vec2 tess_pos_r = tess_pos + tess_next_u;\n");
WRITE(p, " spline_weight(tess_pos_r + patch_pos, knots, weights);\n");
WRITE(p, " vec3 pos_r = tess_sample(_pos, weights);\n");
// Left
WRITE(p, " vec2 tess_pos_l = tess_pos - tess_next_u;\n");
WRITE(p, " spline_weight(tess_pos_l + patch_pos, knots, weights);\n");
WRITE(p, " vec3 pos_l = tess_sample(_pos, weights);\n");
// Down
WRITE(p, " vec2 tess_pos_d = tess_pos + tess_next_v;\n");
WRITE(p, " spline_weight(tess_pos_d + patch_pos, knots, weights);\n");
WRITE(p, " vec3 pos_d = tess_sample(_pos, weights);\n");
// Up
WRITE(p, " vec2 tess_pos_u = tess_pos - tess_next_v;\n");
WRITE(p, " spline_weight(tess_pos_u + patch_pos, knots, weights);\n");
WRITE(p, " vec3 pos_u = tess_sample(_pos, weights);\n");
WRITE(p, " vec3 du = pos_r - pos_l;\n");
WRITE(p, " vec3 dv = pos_d - pos_u;\n");
}
WRITE(p, " vec3 nrm = cross(du, dv);\n");
WRITE(p, " nrm = normalize(nrm);\n");
}
WRITE(p, " vec3 worldpos = vec4(pos.xyz, 1.0) * base.world_mtx;\n");
if (hasNormal) {
WRITE(p, " mediump vec3 worldnormal = normalize(vec4(%snrm, 0.0) * base.world_mtx);\n", flipNormalTess ? "-" : "");
} else {
WRITE(p, " mediump vec3 worldnormal = vec3(0.0, 0.0, 1.0);\n");
}
} else {
// No skinning, just standard T&L.
WRITE(p, " vec3 worldpos = vec4(position.xyz, 1.0) * base.world_mtx;\n");
if (hasNormal)
WRITE(p, " mediump vec3 worldnormal = normalize(vec4(%snormal, 0.0) * base.world_mtx);\n", flipNormal ? "-" : "");
else
WRITE(p, " mediump vec3 worldnormal = vec3(0.0, 0.0, 1.0);\n");
}
} else {
static const char *rescale[4] = { "", " * 1.9921875", " * 1.999969482421875", "" }; // 2*127.5f/128.f, 2*32767.5f/32768.f, 1.0f};
const char *factor = rescale[boneWeightScale];
static const char * const boneWeightAttr[8] = {
"w1.x", "w1.y", "w1.z", "w1.w",
"w2.x", "w2.y", "w2.z", "w2.w",
};
WRITE(p, " mat3x4 skinMatrix = w1.x * bone.m[0];\n");
if (numBoneWeights > 1) {
for (int i = 1; i < numBoneWeights; i++) {
WRITE(p, " skinMatrix += %s * bone.m[%i];\n", boneWeightAttr[i], i);
}
}
WRITE(p, ";\n");
// Trying to simplify this results in bugs in LBP...
WRITE(p, " vec3 skinnedpos = (vec4(position, 1.0) * skinMatrix) %s;\n", factor);
WRITE(p, " vec3 worldpos = vec4(skinnedpos, 1.0) * base.world_mtx;\n");
if (hasNormal) {
WRITE(p, " mediump vec3 skinnednormal = vec4(%snormal, 0.0) * skinMatrix %s;\n", flipNormal ? "-" : "", factor);
} else {
WRITE(p, " mediump vec3 skinnednormal = vec4(0.0, 0.0, %s1.0, 0.0) * skinMatrix %s;\n", flipNormal ? "-" : "", factor);
}
WRITE(p, " mediump vec3 worldnormal = normalize(vec4(skinnednormal, 0.0) * base.world_mtx);\n");
}
WRITE(p, " vec4 viewPos = vec4(vec4(worldpos, 1.0) * base.view_mtx, 1.0);\n");
// Final view and projection transforms.
if (gstate_c.Supports(GPU_ROUND_DEPTH_TO_16BIT)) {
WRITE(p, " vec4 outPos = depthRoundZVP(base.proj_mtx * viewPos);\n");
} else {
WRITE(p, " vec4 outPos = base.proj_mtx * viewPos;\n");
}
// TODO: Declare variables for dots for shade mapping if needed.
const char *ambientStr = ((matUpdate & 1) && hasColor) ? "color0" : "base.matambientalpha";
const char *diffuseStr = ((matUpdate & 2) && hasColor) ? "color0.rgb" : "light.matdiffuse";
const char *specularStr = ((matUpdate & 4) && hasColor) ? "color0.rgb" : "light.matspecular.rgb";
if (doBezier || doSpline) {
ambientStr = (matUpdate & 1) && hasColor ? "col" : "base.matambientalpha";
diffuseStr = (matUpdate & 2) && hasColor ? "col.rgb" : "light.matdiffuse";
specularStr = (matUpdate & 4) && hasColor ? "col.rgb" : "light.matspecular.rgb";
}
bool diffuseIsZero = true;
bool specularIsZero = true;
bool distanceNeeded = false;
if (enableLighting) {
WRITE(p, " vec4 lightSum0 = light.u_ambient * %s + vec4(light.matemissive, 0.0);\n", ambientStr);
for (int i = 0; i < 4; i++) {
GELightType type = static_cast<GELightType>(id.Bits(VS_BIT_LIGHT0_TYPE + 4 * i, 2));
GELightComputation comp = static_cast<GELightComputation>(id.Bits(VS_BIT_LIGHT0_COMP + 4 * i, 2));
if (doLight[i] != LIGHT_FULL)
continue;
diffuseIsZero = false;
if (comp != GE_LIGHTCOMP_ONLYDIFFUSE)
specularIsZero = false;
if (type != GE_LIGHTTYPE_DIRECTIONAL)
distanceNeeded = true;
}
if (!specularIsZero) {
WRITE(p, " vec3 lightSum1 = vec3(0.0);\n");
}
if (!diffuseIsZero) {
WRITE(p, " vec3 toLight;\n");
WRITE(p, " vec3 diffuse;\n");
}
if (distanceNeeded) {
WRITE(p, " float distance;\n");
WRITE(p, " float lightScale;\n");
}
}
// Calculate lights if needed. If shade mapping is enabled, lights may need to be
// at least partially calculated.
for (int i = 0; i < 4; i++) {
if (doLight[i] != LIGHT_FULL)
continue;
GELightType type = static_cast<GELightType>(id.Bits(VS_BIT_LIGHT0_TYPE + 4 * i, 2));
GELightComputation comp = static_cast<GELightComputation>(id.Bits(VS_BIT_LIGHT0_COMP + 4 * i, 2));
if (type == GE_LIGHTTYPE_DIRECTIONAL) {
// We prenormalize light positions for directional lights.
WRITE(p, " toLight = light.pos[%i];\n", i);
} else {
WRITE(p, " toLight = light.pos[%i] - worldpos;\n", i);
WRITE(p, " distance = length(toLight);\n");
WRITE(p, " toLight /= distance;\n");
}
bool doSpecular = comp != GE_LIGHTCOMP_ONLYDIFFUSE;
bool poweredDiffuse = comp == GE_LIGHTCOMP_BOTHWITHPOWDIFFUSE;
WRITE(p, " mediump float dot%i = max(dot(toLight, worldnormal), 0.0);\n", i);
if (poweredDiffuse) {
// pow(0.0, 0.0) may be undefined, but the PSP seems to treat it as 1.0.
// Seen in Tales of the World: Radiant Mythology (#2424.)
WRITE(p, " if (dot%i == 0.0 && light.matspecular.a == 0.0) {\n", i);
WRITE(p, " dot%i = 1.0;\n", i);
WRITE(p, " } else {\n");
WRITE(p, " dot%i = pow(dot%i, light.matspecular.a);\n", i, i);
WRITE(p, " }\n");
}
const char *timesLightScale = " * lightScale";
// Attenuation
switch (type) {
case GE_LIGHTTYPE_DIRECTIONAL:
timesLightScale = "";
break;
case GE_LIGHTTYPE_POINT:
WRITE(p, " lightScale = clamp(1.0 / dot(light.att[%i], vec3(1.0, distance, distance*distance)), 0.0, 1.0);\n", i);
break;
case GE_LIGHTTYPE_SPOT:
case GE_LIGHTTYPE_UNKNOWN:
WRITE(p, " float angle%i = dot(normalize(light.dir[%i]), toLight);\n", i, i);
WRITE(p, " if (angle%i >= light.angle_spotCoef[%i].x) {\n", i, i);
WRITE(p, " lightScale = clamp(1.0 / dot(light.att[%i], vec3(1.0, distance, distance*distance)), 0.0, 1.0) * pow(angle%i, light.angle_spotCoef[%i].y);\n", i, i, i);
WRITE(p, " } else {\n");
WRITE(p, " lightScale = 0.0;\n");
WRITE(p, " }\n");
break;
default:
// ILLEGAL
break;
}
WRITE(p, " diffuse = (light.diffuse[%i] * %s) * dot%i;\n", i, diffuseStr, i);
if (doSpecular) {
WRITE(p, " dot%i = dot(normalize(toLight + vec3(0.0, 0.0, 1.0)), worldnormal);\n", i);
WRITE(p, " if (dot%i > 0.0)\n", i);
WRITE(p, " lightSum1 += light.specular[%i] * %s * (pow(dot%i, light.matspecular.a) %s);\n", i, specularStr, i, timesLightScale);
}
WRITE(p, " lightSum0.rgb += (light.ambient[%i] * %s.rgb + diffuse)%s;\n", i, ambientStr, timesLightScale);
}
if (enableLighting) {
// Sum up ambient, emissive here.
if (lmode) {
WRITE(p, " v_color0 = clamp(lightSum0, 0.0, 1.0);\n");
// v_color1 only exists when lmode = 1.
if (specularIsZero) {
WRITE(p, " v_color1 = vec3(0.0);\n");
} else {
WRITE(p, " v_color1 = clamp(lightSum1, 0.0, 1.0);\n");
}
} else {
if (specularIsZero) {
WRITE(p, " v_color0 = clamp(lightSum0, 0.0, 1.0);\n");
} else {
WRITE(p, " v_color0 = clamp(clamp(lightSum0, 0.0, 1.0) + vec4(lightSum1, 0.0), 0.0, 1.0);\n");
}
}
} else {
// Lighting doesn't affect color.
if (hasColor) {
if (doBezier || doSpline)
WRITE(p, " v_color0 = col;\n");
else
WRITE(p, " v_color0 = color0;\n");
} else {
WRITE(p, " v_color0 = base.matambientalpha;\n");
}
if (lmode) {
WRITE(p, " v_color1 = vec3(0.0);\n");
}
}
bool scaleUV = !isModeThrough && (uvGenMode == GE_TEXMAP_TEXTURE_COORDS || uvGenMode == GE_TEXMAP_UNKNOWN);
// Step 3: UV generation
if (doTexture) {
switch (uvGenMode) {
case GE_TEXMAP_TEXTURE_COORDS: // Scale-offset. Easy.
case GE_TEXMAP_UNKNOWN: // Not sure what this is, but Riviera uses it. Treating as coords works.
if (scaleUV) {
if (hasTexcoord) {
if (doBezier || doSpline)
WRITE(p, " v_texcoord = vec3(tex.xy * base.uvscaleoffset.xy + base.uvscaleoffset.zw, 0.0);\n");
else
WRITE(p, " v_texcoord = vec3(texcoord.xy * base.uvscaleoffset.xy, 0.0);\n");
} else {
WRITE(p, " v_texcoord = vec3(0.0);\n");
}
} else {
if (hasTexcoord) {
if (doBezier || doSpline)
WRITE(p, " v_texcoord = vec3(tex.xy * base.uvscaleoffset.xy + base.uvscaleoffset.zw, 0.0);\n");
else
WRITE(p, " v_texcoord = vec3(texcoord.xy * base.uvscaleoffset.xy + base.uvscaleoffset.zw, 0.0);\n");
} else {
WRITE(p, " v_texcoord = vec3(base.uvscaleoffset.zw, 0.0);\n");
}
}
break;
case GE_TEXMAP_TEXTURE_MATRIX: // Projection mapping.
{
std::string temp_tc;
switch (uvProjMode) {
case GE_PROJMAP_POSITION: // Use model space XYZ as source
temp_tc = "vec4(position.xyz, 1.0)";
break;
case GE_PROJMAP_UV: // Use unscaled UV as source
{
// scaleUV is false here.
if (hasTexcoord) {
temp_tc = "vec4(texcoord.xy, 0.0, 1.0)";
} else {
temp_tc = "vec4(0.0, 0.0, 0.0, 1.0)";
}
}
break;
case GE_PROJMAP_NORMALIZED_NORMAL: // Use normalized transformed normal as source
if (hasNormal)
temp_tc = flipNormal ? "vec4(normalize(-normal), 1.0)" : "vec4(normalize(normal), 1.0)";
else
temp_tc = "vec4(0.0, 0.0, 1.0, 1.0)";
break;
case GE_PROJMAP_NORMAL: // Use non-normalized transformed normal as source
if (hasNormal)
temp_tc = flipNormal ? "vec4(-normal, 1.0)" : "vec4(normal, 1.0)";
else
temp_tc = "vec4(0.0, 0.0, 1.0, 1.0)";
break;
}
// Transform by texture matrix. XYZ as we are doing projection mapping.
WRITE(p, " v_texcoord = (%s * base.tex_mtx).xyz * vec3(base.uvscaleoffset.xy, 1.0);\n", temp_tc.c_str());
}
break;
case GE_TEXMAP_ENVIRONMENT_MAP: // Shade mapping - use dots from light sources.
WRITE(p, " v_texcoord = vec3(base.uvscaleoffset.xy * vec2(1.0 + dot(normalize(light.pos[%i]), worldnormal), 1.0 + dot(normalize(light.pos[%i]), worldnormal)) * 0.5, 1.0);\n", ls0, ls1);
break;
default:
// ILLEGAL
break;
}
}
// Compute fogdepth
if (enableFog)
WRITE(p, " v_fogdepth = (viewPos.z + base.fogcoef.x) * base.fogcoef.y;\n");
}
if (!isModeThrough) {
WRITE(p, " vec3 projPos = outPos.xyz / outPos.w;\n");
// Vertex range culling doesn't happen when depth is clamped, so only do this if in range.
WRITE(p, " if (base.cullRangeMin.w <= 0.0f || (projPos.z >= base.cullRangeMin.z && projPos.z <= base.cullRangeMax.z)) {\n");
const char *outMin = "projPos.x < base.cullRangeMin.x || projPos.y < base.cullRangeMin.y || projPos.z < base.cullRangeMin.z";
const char *outMax = "projPos.x > base.cullRangeMax.x || projPos.y > base.cullRangeMax.y || projPos.z > base.cullRangeMax.z";
WRITE(p, " if (%s || %s) {\n", outMin, outMax);
WRITE(p, " outPos.w = base.cullRangeMax.w;\n");
WRITE(p, " }\n");
WRITE(p, " }\n");
}
WRITE(p, " gl_Position = outPos;\n");
WRITE(p, "}\n");
return true;
}
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