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GPU3D_OpenGL.cpp
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GPU3D_OpenGL.cpp
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/*
Copyright 2016-2024 melonDS team
This file is part of melonDS.
melonDS 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, either version 3 of the License, or (at your option)
any later version.
melonDS 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 for more details.
You should have received a copy of the GNU General Public License along
with melonDS. If not, see http://www.gnu.org/licenses/.
*/
#include "GPU3D_OpenGL.h"
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include "NDS.h"
#include "GPU.h"
#include "GPU3D_OpenGL_shaders.h"
namespace melonDS
{
bool GLRenderer::BuildRenderShader(u32 flags, const std::string& vs, const std::string& fs)
{
char shadername[32];
snprintf(shadername, sizeof(shadername), "RenderShader%02X", flags);
int headerlen = strlen(kShaderHeader);
std::string vsbuf;
vsbuf += kShaderHeader;
vsbuf += kRenderVSCommon;
vsbuf += vs;
std::string fsbuf;
fsbuf += kShaderHeader;
fsbuf += kRenderFSCommon;
fsbuf += fs;
GLuint prog;
bool ret = OpenGL::CompileVertexFragmentProgram(prog,
vsbuf, fsbuf,
shadername,
{{"vPosition", 0}, {"vColor", 1}, {"vTexcoord", 2}, {"vPolygonAttr", 3}},
{{"oColor", 0}, {"oAttr", 1}});
if (!ret) return false;
GLint uni_id = glGetUniformBlockIndex(prog, "uConfig");
glUniformBlockBinding(prog, uni_id, 0);
glUseProgram(prog);
uni_id = glGetUniformLocation(prog, "TexMem");
glUniform1i(uni_id, 0);
uni_id = glGetUniformLocation(prog, "TexPalMem");
glUniform1i(uni_id, 1);
RenderShader[flags] = prog;
return true;
}
void GLRenderer::UseRenderShader(u32 flags)
{
if (CurShaderID == flags) return;
glUseProgram(RenderShader[flags]);
CurShaderID = flags;
}
void SetupDefaultTexParams(GLuint tex)
{
glBindTexture(GL_TEXTURE_2D, tex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
}
GLRenderer::GLRenderer(GLCompositor&& compositor) noexcept :
Renderer3D(true),
CurGLCompositor(std::move(compositor))
{
// GLRenderer::New() will be used to actually initialize the renderer;
// The various glDelete* functions silently ignore invalid IDs,
// so we can just let the destructor clean up a half-initialized renderer.
}
std::unique_ptr<GLRenderer> GLRenderer::New() noexcept
{
assert(glEnable != nullptr);
std::optional<GLCompositor> compositor = GLCompositor::New();
if (!compositor)
return nullptr;
// Will be returned if the initialization succeeds,
// or cleaned up via RAII if it fails.
std::unique_ptr<GLRenderer> result = std::unique_ptr<GLRenderer>(new GLRenderer(std::move(*compositor)));
compositor = std::nullopt;
glEnable(GL_DEPTH_TEST);
glEnable(GL_STENCIL_TEST);
glDepthRange(0, 1);
glClearDepth(1.0);
if (!OpenGL::CompileVertexFragmentProgram(result->ClearShaderPlain,
kClearVS, kClearFS,
"ClearShader",
{{"vPosition", 0}},
{{"oColor", 0}, {"oAttr", 1}}))
return nullptr;
result->ClearUniformLoc[0] = glGetUniformLocation(result->ClearShaderPlain, "uColor");
result->ClearUniformLoc[1] = glGetUniformLocation(result->ClearShaderPlain, "uDepth");
result->ClearUniformLoc[2] = glGetUniformLocation(result->ClearShaderPlain, "uOpaquePolyID");
result->ClearUniformLoc[3] = glGetUniformLocation(result->ClearShaderPlain, "uFogFlag");
memset(result->RenderShader, 0, sizeof(RenderShader));
if (!result->BuildRenderShader(0, kRenderVS_Z, kRenderFS_ZO))
return nullptr;
if (!result->BuildRenderShader(RenderFlag_WBuffer, kRenderVS_W, kRenderFS_WO))
return nullptr;
if (!result->BuildRenderShader(RenderFlag_Edge, kRenderVS_Z, kRenderFS_ZE))
return nullptr;
if (!result->BuildRenderShader(RenderFlag_Edge | RenderFlag_WBuffer, kRenderVS_W, kRenderFS_WE))
return nullptr;
if (!result->BuildRenderShader(RenderFlag_Trans, kRenderVS_Z, kRenderFS_ZT))
return nullptr;
if (!result->BuildRenderShader(RenderFlag_Trans | RenderFlag_WBuffer, kRenderVS_W, kRenderFS_WT))
return nullptr;
if (!result->BuildRenderShader(RenderFlag_ShadowMask, kRenderVS_Z, kRenderFS_ZSM))
return nullptr;
if (!result->BuildRenderShader(RenderFlag_ShadowMask | RenderFlag_WBuffer, kRenderVS_W, kRenderFS_WSM))
return nullptr;
if (!OpenGL::CompileVertexFragmentProgram(result->FinalPassEdgeShader,
kFinalPassVS, kFinalPassEdgeFS,
"FinalPassEdgeShader",
{{"vPosition", 0}},
{{"oColor", 0}}))
return nullptr;
if (!OpenGL::CompileVertexFragmentProgram(result->FinalPassFogShader,
kFinalPassVS, kFinalPassFogFS,
"FinalPassFogShader",
{{"vPosition", 0}},
{{"oColor", 0}}))
return nullptr;
GLuint uni_id = glGetUniformBlockIndex(result->FinalPassEdgeShader, "uConfig");
glUniformBlockBinding(result->FinalPassEdgeShader, uni_id, 0);
glUseProgram(result->FinalPassEdgeShader);
uni_id = glGetUniformLocation(result->FinalPassEdgeShader, "DepthBuffer");
glUniform1i(uni_id, 0);
uni_id = glGetUniformLocation(result->FinalPassEdgeShader, "AttrBuffer");
glUniform1i(uni_id, 1);
uni_id = glGetUniformBlockIndex(result->FinalPassFogShader, "uConfig");
glUniformBlockBinding(result->FinalPassFogShader, uni_id, 0);
glUseProgram(result->FinalPassFogShader);
uni_id = glGetUniformLocation(result->FinalPassFogShader, "DepthBuffer");
glUniform1i(uni_id, 0);
uni_id = glGetUniformLocation(result->FinalPassFogShader, "AttrBuffer");
glUniform1i(uni_id, 1);
memset(&result->ShaderConfig, 0, sizeof(ShaderConfig));
glGenBuffers(1, &result->ShaderConfigUBO);
glBindBuffer(GL_UNIFORM_BUFFER, result->ShaderConfigUBO);
static_assert((sizeof(ShaderConfig) & 15) == 0);
glBufferData(GL_UNIFORM_BUFFER, sizeof(ShaderConfig), &result->ShaderConfig, GL_STATIC_DRAW);
glBindBufferBase(GL_UNIFORM_BUFFER, 0, result->ShaderConfigUBO);
float clearvtx[6*2] =
{
-1.0, -1.0,
1.0, 1.0,
-1.0, 1.0,
-1.0, -1.0,
1.0, -1.0,
1.0, 1.0
};
glGenBuffers(1, &result->ClearVertexBufferID);
glBindBuffer(GL_ARRAY_BUFFER, result->ClearVertexBufferID);
glBufferData(GL_ARRAY_BUFFER, sizeof(clearvtx), clearvtx, GL_STATIC_DRAW);
glGenVertexArrays(1, &result->ClearVertexArrayID);
glBindVertexArray(result->ClearVertexArrayID);
glEnableVertexAttribArray(0); // position
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, (void*)(0));
glGenBuffers(1, &result->VertexBufferID);
glBindBuffer(GL_ARRAY_BUFFER, result->VertexBufferID);
glBufferData(GL_ARRAY_BUFFER, sizeof(VertexBuffer), nullptr, GL_DYNAMIC_DRAW);
glGenVertexArrays(1, &result->VertexArrayID);
glBindVertexArray(result->VertexArrayID);
glEnableVertexAttribArray(0); // position
glVertexAttribIPointer(0, 4, GL_UNSIGNED_SHORT, 7*4, (void*)(0));
glEnableVertexAttribArray(1); // color
glVertexAttribIPointer(1, 4, GL_UNSIGNED_BYTE, 7*4, (void*)(2*4));
glEnableVertexAttribArray(2); // texcoords
glVertexAttribIPointer(2, 2, GL_SHORT, 7*4, (void*)(3*4));
glEnableVertexAttribArray(3); // attrib
glVertexAttribIPointer(3, 3, GL_UNSIGNED_INT, 7*4, (void*)(4*4));
glGenBuffers(1, &result->IndexBufferID);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, result->IndexBufferID);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(IndexBuffer), nullptr, GL_DYNAMIC_DRAW);
glGenFramebuffers(1, &result->MainFramebuffer);
glGenFramebuffers(1, &result->DownscaleFramebuffer);
// color buffers
glGenTextures(1, &result->ColorBufferTex);
SetupDefaultTexParams(result->ColorBufferTex);
// depth/stencil buffer
glGenTextures(1, &result->DepthBufferTex);
SetupDefaultTexParams(result->DepthBufferTex);
// attribute buffer
// R: opaque polyID (for edgemarking)
// G: edge flag
// B: fog flag
glGenTextures(1, &result->AttrBufferTex);
SetupDefaultTexParams(result->AttrBufferTex);
// downscale framebuffer for display capture (always 256x192)
glGenTextures(1, &result->DownScaleBufferTex);
SetupDefaultTexParams(result->DownScaleBufferTex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 256, 192, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glEnable(GL_BLEND);
glBlendEquationSeparate(GL_FUNC_ADD, GL_MAX);
glGenBuffers(1, &result->PixelbufferID);
glActiveTexture(GL_TEXTURE0);
glGenTextures(1, &result->TexMemID);
glBindTexture(GL_TEXTURE_2D, result->TexMemID);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_R8UI, 1024, 512, 0, GL_RED_INTEGER, GL_UNSIGNED_BYTE, NULL);
glActiveTexture(GL_TEXTURE1);
glGenTextures(1, &result->TexPalMemID);
glBindTexture(GL_TEXTURE_2D, result->TexPalMemID);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB5_A1, 1024, 48, 0, GL_RGBA, GL_UNSIGNED_SHORT_1_5_5_5_REV, NULL);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
return result;
}
GLRenderer::~GLRenderer()
{
assert(glDeleteTextures != nullptr);
glDeleteTextures(1, &TexMemID);
glDeleteTextures(1, &TexPalMemID);
glDeleteFramebuffers(1, &MainFramebuffer);
glDeleteFramebuffers(1, &DownscaleFramebuffer);
glDeleteTextures(1, &ColorBufferTex);
glDeleteTextures(1, &DepthBufferTex);
glDeleteTextures(1, &AttrBufferTex);
glDeleteTextures(1, &DownScaleBufferTex);
glDeleteVertexArrays(1, &VertexArrayID);
glDeleteBuffers(1, &VertexBufferID);
glDeleteVertexArrays(1, &ClearVertexArrayID);
glDeleteBuffers(1, &ClearVertexBufferID);
glDeleteBuffers(1, &ShaderConfigUBO);
for (int i = 0; i < 16; i++)
{
if (!RenderShader[i]) continue;
glDeleteProgram(RenderShader[i]);
}
}
void GLRenderer::Reset(GPU& gpu)
{
// This is where the compositor's Reset() method would be called,
// except there's no such method right now.
}
void GLRenderer::SetBetterPolygons(bool betterpolygons) noexcept
{
SetRenderSettings(betterpolygons, ScaleFactor);
}
void GLRenderer::SetScaleFactor(int scale) noexcept
{
SetRenderSettings(BetterPolygons, scale);
}
void GLRenderer::SetRenderSettings(bool betterpolygons, int scale) noexcept
{
if (betterpolygons == BetterPolygons && scale == ScaleFactor)
return;
CurGLCompositor.SetScaleFactor(scale);
ScaleFactor = scale;
BetterPolygons = betterpolygons;
ScreenW = 256 * scale;
ScreenH = 192 * scale;
glBindTexture(GL_TEXTURE_2D, ColorBufferTex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, ScreenW, ScreenH, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glBindTexture(GL_TEXTURE_2D, DepthBufferTex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH24_STENCIL8, ScreenW, ScreenH, 0, GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8, NULL);
glBindTexture(GL_TEXTURE_2D, AttrBufferTex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, ScreenW, ScreenH, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
glBindFramebuffer(GL_FRAMEBUFFER, DownscaleFramebuffer);
glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, DownScaleBufferTex, 0);
GLenum fbassign[2] = {GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1};
glBindFramebuffer(GL_FRAMEBUFFER, MainFramebuffer);
glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, ColorBufferTex, 0);
glFramebufferTexture(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, DepthBufferTex, 0);
glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, AttrBufferTex, 0);
glDrawBuffers(2, fbassign);
glBindBuffer(GL_PIXEL_PACK_BUFFER, PixelbufferID);
glBufferData(GL_PIXEL_PACK_BUFFER, 256*192*4, NULL, GL_DYNAMIC_READ);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
//glLineWidth(scale);
//glLineWidth(1.5);
}
void GLRenderer::SetupPolygon(GLRenderer::RendererPolygon* rp, Polygon* polygon) const
{
rp->PolyData = polygon;
// render key: depending on what we're drawing
// opaque polygons:
// - depthfunc
// -- alpha=0
// regular translucent polygons:
// - depthfunc
// -- depthwrite
// --- polyID
// ---- need opaque
// shadow mask polygons:
// - depthfunc?????
// shadow polygons:
// - depthfunc
// -- depthwrite
// --- polyID
rp->RenderKey = (polygon->Attr >> 14) & 0x1; // bit14 - depth func
if (!polygon->IsShadowMask)
{
if (polygon->Translucent)
{
if (polygon->IsShadow) rp->RenderKey |= 0x20000;
else rp->RenderKey |= 0x10000;
rp->RenderKey |= (polygon->Attr >> 10) & 0x2; // bit11 - depth write
rp->RenderKey |= (polygon->Attr >> 13) & 0x4; // bit15 - fog
rp->RenderKey |= (polygon->Attr & 0x3F000000) >> 16; // polygon ID
if ((polygon->Attr & 0x001F0000) == 0x001F0000) // need opaque
rp->RenderKey |= 0x4000;
}
else
{
if ((polygon->Attr & 0x001F0000) == 0)
rp->RenderKey |= 0x2;
rp->RenderKey |= (polygon->Attr & 0x3F000000) >> 16; // polygon ID
}
}
else
{
rp->RenderKey |= 0x30000;
}
}
u32* GLRenderer::SetupVertex(const Polygon* poly, int vid, const Vertex* vtx, u32 vtxattr, u32* vptr) const
{
u32 z = poly->FinalZ[vid];
u32 w = poly->FinalW[vid];
u32 alpha = (poly->Attr >> 16) & 0x1F;
// Z should always fit within 16 bits, so it's okay to do this
u32 zshift = 0;
while (z > 0xFFFF) { z >>= 1; zshift++; }
u32 x, y;
if (ScaleFactor > 1)
{
x = (vtx->HiresPosition[0] * ScaleFactor) >> 4;
y = (vtx->HiresPosition[1] * ScaleFactor) >> 4;
}
else
{
x = vtx->FinalPosition[0];
y = vtx->FinalPosition[1];
}
// correct nearly-vertical edges that would look vertical on the DS
/*{
int vtopid = vid - 1;
if (vtopid < 0) vtopid = poly->NumVertices-1;
Vertex* vtop = poly->Vertices[vtopid];
if (vtop->FinalPosition[1] >= vtx->FinalPosition[1])
{
vtopid = vid + 1;
if (vtopid >= poly->NumVertices) vtopid = 0;
vtop = poly->Vertices[vtopid];
}
if ((vtop->FinalPosition[1] < vtx->FinalPosition[1]) &&
(vtx->FinalPosition[0] == vtop->FinalPosition[0]-1))
{
if (ScaleFactor > 1)
x = (vtop->HiresPosition[0] * ScaleFactor) >> 4;
else
x = vtop->FinalPosition[0];
}
}*/
*vptr++ = x | (y << 16);
*vptr++ = z | (w << 16);
*vptr++ = (vtx->FinalColor[0] >> 1) |
((vtx->FinalColor[1] >> 1) << 8) |
((vtx->FinalColor[2] >> 1) << 16) |
(alpha << 24);
*vptr++ = (u16)vtx->TexCoords[0] | ((u16)vtx->TexCoords[1] << 16);
*vptr++ = vtxattr | (zshift << 16);
*vptr++ = poly->TexParam;
*vptr++ = poly->TexPalette;
return vptr;
}
void GLRenderer::BuildPolygons(GLRenderer::RendererPolygon* polygons, int npolys)
{
u32* vptr = &VertexBuffer[0];
u32 vidx = 0;
u32 iidx = 0;
u32 eidx = EdgeIndicesOffset;
for (int i = 0; i < npolys; i++)
{
RendererPolygon* rp = &polygons[i];
Polygon* poly = rp->PolyData;
rp->IndicesOffset = iidx;
rp->NumIndices = 0;
u32 vidx_first = vidx;
u32 polyattr = poly->Attr;
u32 alpha = (polyattr >> 16) & 0x1F;
u32 vtxattr = polyattr & 0x1F00C8F0;
if (poly->FacingView) vtxattr |= (1<<8);
if (poly->WBuffer) vtxattr |= (1<<9);
// assemble vertices
if (poly->Type == 1) // line
{
rp->PrimType = GL_LINES;
u32 lastx, lasty;
int nout = 0;
for (u32 j = 0; j < poly->NumVertices; j++)
{
Vertex* vtx = poly->Vertices[j];
if (j > 0)
{
if (lastx == vtx->FinalPosition[0] &&
lasty == vtx->FinalPosition[1]) continue;
}
lastx = vtx->FinalPosition[0];
lasty = vtx->FinalPosition[1];
vptr = SetupVertex(poly, j, vtx, vtxattr, vptr);
IndexBuffer[iidx++] = vidx;
rp->NumIndices++;
vidx++;
nout++;
if (nout >= 2) break;
}
}
else if (poly->NumVertices == 3) // regular triangle
{
rp->PrimType = GL_TRIANGLES;
for (int j = 0; j < 3; j++)
{
Vertex* vtx = poly->Vertices[j];
vptr = SetupVertex(poly, j, vtx, vtxattr, vptr);
vidx++;
}
// build a triangle
IndexBuffer[iidx++] = vidx_first;
IndexBuffer[iidx++] = vidx - 2;
IndexBuffer[iidx++] = vidx - 1;
rp->NumIndices += 3;
}
else // quad, pentagon, etc
{
rp->PrimType = GL_TRIANGLES;
if (!BetterPolygons)
{
// regular triangle-splitting
for (u32 j = 0; j < poly->NumVertices; j++)
{
Vertex* vtx = poly->Vertices[j];
vptr = SetupVertex(poly, j, vtx, vtxattr, vptr);
if (j >= 2)
{
// build a triangle
IndexBuffer[iidx++] = vidx_first;
IndexBuffer[iidx++] = vidx - 1;
IndexBuffer[iidx++] = vidx;
rp->NumIndices += 3;
}
vidx++;
}
}
else
{
// attempt at 'better' splitting
// this doesn't get rid of the error while splitting a bigger polygon into triangles
// but we can attempt to reduce it
u32 cX = 0, cY = 0;
float cZ = 0;
float cW = 0;
float cR = 0, cG = 0, cB = 0;
float cS = 0, cT = 0;
for (u32 j = 0; j < poly->NumVertices; j++)
{
Vertex* vtx = poly->Vertices[j];
cX += vtx->HiresPosition[0];
cY += vtx->HiresPosition[1];
float fw = (float)poly->FinalW[j] * poly->NumVertices;
cW += 1.0f / fw;
if (poly->WBuffer) cZ += poly->FinalZ[j] / fw;
else cZ += poly->FinalZ[j];
cR += (vtx->FinalColor[0] >> 1) / fw;
cG += (vtx->FinalColor[1] >> 1) / fw;
cB += (vtx->FinalColor[2] >> 1) / fw;
cS += vtx->TexCoords[0] / fw;
cT += vtx->TexCoords[1] / fw;
}
cX /= poly->NumVertices;
cY /= poly->NumVertices;
cW = 1.0f / cW;
if (poly->WBuffer) cZ *= cW;
else cZ /= poly->NumVertices;
cR *= cW;
cG *= cW;
cB *= cW;
cS *= cW;
cT *= cW;
cX = (cX * ScaleFactor) >> 4;
cY = (cY * ScaleFactor) >> 4;
u32 w = (u32)cW;
u32 z = (u32)cZ;
u32 zshift = 0;
while (z > 0xFFFF) { z >>= 1; zshift++; }
// build center vertex
*vptr++ = cX | (cY << 16);
*vptr++ = z | (w << 16);
*vptr++ = (u32)cR |
((u32)cG << 8) |
((u32)cB << 16) |
(alpha << 24);
*vptr++ = (u16)cS | ((u16)cT << 16);
*vptr++ = vtxattr | (zshift << 16);
*vptr++ = poly->TexParam;
*vptr++ = poly->TexPalette;
vidx++;
// build the final polygon
for (u32 j = 0; j < poly->NumVertices; j++)
{
Vertex* vtx = poly->Vertices[j];
vptr = SetupVertex(poly, j, vtx, vtxattr, vptr);
if (j >= 1)
{
// build a triangle
IndexBuffer[iidx++] = vidx_first;
IndexBuffer[iidx++] = vidx - 1;
IndexBuffer[iidx++] = vidx;
rp->NumIndices += 3;
}
vidx++;
}
IndexBuffer[iidx++] = vidx_first;
IndexBuffer[iidx++] = vidx - 1;
IndexBuffer[iidx++] = vidx_first + 1;
rp->NumIndices += 3;
}
}
rp->EdgeIndicesOffset = eidx;
rp->NumEdgeIndices = 0;
u32 vidx_cur = vidx_first;
for (u32 j = 1; j < poly->NumVertices; j++)
{
IndexBuffer[eidx++] = vidx_cur;
IndexBuffer[eidx++] = vidx_cur + 1;
vidx_cur++;
rp->NumEdgeIndices += 2;
}
IndexBuffer[eidx++] = vidx_cur;
IndexBuffer[eidx++] = vidx_first;
rp->NumEdgeIndices += 2;
}
NumVertices = vidx;
NumIndices = iidx;
NumEdgeIndices = eidx - EdgeIndicesOffset;
}
int GLRenderer::RenderSinglePolygon(int i) const
{
const RendererPolygon* rp = &PolygonList[i];
glDrawElements(rp->PrimType, rp->NumIndices, GL_UNSIGNED_SHORT, (void*)(uintptr_t)(rp->IndicesOffset * 2));
return 1;
}
int GLRenderer::RenderPolygonBatch(int i) const
{
const RendererPolygon* rp = &PolygonList[i];
GLuint primtype = rp->PrimType;
u32 key = rp->RenderKey;
int numpolys = 0;
u32 numindices = 0;
for (int iend = i; iend < NumFinalPolys; iend++)
{
const RendererPolygon* cur_rp = &PolygonList[iend];
if (cur_rp->PrimType != primtype) break;
if (cur_rp->RenderKey != key) break;
numpolys++;
numindices += cur_rp->NumIndices;
}
glDrawElements(primtype, numindices, GL_UNSIGNED_SHORT, (void*)(uintptr_t)(rp->IndicesOffset * 2));
return numpolys;
}
int GLRenderer::RenderPolygonEdgeBatch(int i) const
{
const RendererPolygon* rp = &PolygonList[i];
u32 key = rp->RenderKey;
int numpolys = 0;
u32 numindices = 0;
for (int iend = i; iend < NumFinalPolys; iend++)
{
const RendererPolygon* cur_rp = &PolygonList[iend];
if (cur_rp->RenderKey != key) break;
numpolys++;
numindices += cur_rp->NumEdgeIndices;
}
glDrawElements(GL_LINES, numindices, GL_UNSIGNED_SHORT, (void*)(uintptr_t)(rp->EdgeIndicesOffset * 2));
return numpolys;
}
void GLRenderer::RenderSceneChunk(const GPU3D& gpu3d, int y, int h)
{
u32 flags = 0;
if (gpu3d.RenderPolygonRAM[0]->WBuffer) flags |= RenderFlag_WBuffer;
if (h != 192) glScissor(0, y<<ScaleFactor, 256<<ScaleFactor, h<<ScaleFactor);
GLboolean fogenable = (gpu3d.RenderDispCnt & (1<<7)) ? GL_TRUE : GL_FALSE;
// TODO: proper 'equal' depth test!
// (has margin of +-0x200 in Z-buffer mode, +-0xFF in W-buffer mode)
// for now we're using GL_LEQUAL to make it work to some extent
// pass 1: opaque pixels
UseRenderShader(flags);
glLineWidth(1.0);
glColorMaski(1, GL_TRUE, GL_TRUE, fogenable, GL_FALSE);
glDepthFunc(GL_LESS);
glDepthMask(GL_TRUE);
glBindVertexArray(VertexArrayID);
for (int i = 0; i < NumFinalPolys; )
{
RendererPolygon* rp = &PolygonList[i];
if (rp->PolyData->IsShadowMask) { i++; continue; }
if (rp->PolyData->Translucent) { i++; continue; }
if (rp->PolyData->Attr & (1<<14))
glDepthFunc(GL_LEQUAL);
else
glDepthFunc(GL_LESS);
u32 polyattr = rp->PolyData->Attr;
u32 polyid = (polyattr >> 24) & 0x3F;
glStencilFunc(GL_ALWAYS, polyid, 0xFF);
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
glStencilMask(0xFF);
i += RenderPolygonBatch(i);
}
// if edge marking is enabled, mark all opaque edges
// TODO BETTER EDGE MARKING!!! THIS SUCKS
/*if (RenderDispCnt & (1<<5))
{
UseRenderShader(flags | RenderFlag_Edge);
glLineWidth(1.5);
glColorMaski(0, GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
glColorMaski(1, GL_FALSE, GL_TRUE, GL_FALSE, GL_FALSE);
glDepthFunc(GL_ALWAYS);
glDepthMask(GL_FALSE);
glStencilFunc(GL_ALWAYS, 0, 0xFF);
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
glStencilMask(0);
for (int i = 0; i < NumFinalPolys; )
{
RendererPolygon* rp = &PolygonList[i];
if (rp->PolyData->IsShadowMask) { i++; continue; }
i += RenderPolygonEdgeBatch(i);
}
glDepthMask(GL_TRUE);
}*/
glEnable(GL_BLEND);
glBlendEquationSeparate(GL_FUNC_ADD, GL_MAX);
if (gpu3d.RenderDispCnt & (1<<3))
glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE);
else
glBlendFuncSeparate(GL_ONE, GL_ZERO, GL_ONE, GL_ONE);
glLineWidth(1.0);
if (NumOpaqueFinalPolys > -1)
{
// pass 2: if needed, render translucent pixels that are against background pixels
// when background alpha is zero, those need to be rendered with blending disabled
if ((gpu3d.RenderClearAttr1 & 0x001F0000) == 0)
{
glDisable(GL_BLEND);
for (int i = 0; i < NumFinalPolys; )
{
RendererPolygon* rp = &PolygonList[i];
if (rp->PolyData->IsShadowMask)
{
// draw actual shadow mask
UseRenderShader(flags | RenderFlag_ShadowMask);
glDisable(GL_BLEND);
glColorMaski(0, GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
glColorMaski(1, GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
glDepthMask(GL_FALSE);
glDepthFunc(GL_LESS);
glStencilFunc(GL_EQUAL, 0xFF, 0xFF);
glStencilOp(GL_KEEP, GL_INVERT, GL_KEEP);
glStencilMask(0x01);
i += RenderPolygonBatch(i);
}
else if (rp->PolyData->Translucent)
{
bool needopaque = ((rp->PolyData->Attr & 0x001F0000) == 0x001F0000);
u32 polyattr = rp->PolyData->Attr;
u32 polyid = (polyattr >> 24) & 0x3F;
if (polyattr & (1<<14))
glDepthFunc(GL_LEQUAL);
else
glDepthFunc(GL_LESS);
if (needopaque)
{
UseRenderShader(flags);
glDisable(GL_BLEND);
glColorMaski(0, GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
glColorMaski(1, GL_TRUE, GL_TRUE, fogenable, GL_FALSE);
glStencilFunc(GL_ALWAYS, polyid, 0xFF);
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
glStencilMask(0xFF);
glDepthMask(GL_TRUE);
RenderSinglePolygon(i);
}
UseRenderShader(flags | RenderFlag_Trans);
GLboolean transfog;
if (!(polyattr & (1<<15))) transfog = fogenable;
else transfog = GL_FALSE;
if (rp->PolyData->IsShadow)
{
// shadow against clear-plane will only pass if its polyID matches that of the clear plane
u32 clrpolyid = (gpu3d.RenderClearAttr1 >> 24) & 0x3F;
if (polyid != clrpolyid) { i++; continue; }
glEnable(GL_BLEND);
glColorMaski(0, GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
glColorMaski(1, GL_FALSE, GL_FALSE, transfog, GL_FALSE);
glStencilFunc(GL_EQUAL, 0xFE, 0xFF);
glStencilOp(GL_KEEP, GL_KEEP, GL_INVERT);
glStencilMask(~(0x40|polyid)); // heheh
if (polyattr & (1<<11)) glDepthMask(GL_TRUE);
else glDepthMask(GL_FALSE);
i += needopaque ? RenderSinglePolygon(i) : RenderPolygonBatch(i);
}
else
{
glColorMaski(0, GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
glColorMaski(1, GL_FALSE, GL_FALSE, transfog, GL_FALSE);
glStencilFunc(GL_EQUAL, 0xFF, 0xFE);
glStencilOp(GL_KEEP, GL_KEEP, GL_INVERT);
glStencilMask(~(0x40|polyid)); // heheh
if (polyattr & (1<<11)) glDepthMask(GL_TRUE);
else glDepthMask(GL_FALSE);
i += needopaque ? RenderSinglePolygon(i) : RenderPolygonBatch(i);
}
}
else
i++;
}
glEnable(GL_BLEND);
glStencilMask(0xFF);
}
// pass 3: translucent pixels
for (int i = 0; i < NumFinalPolys; )
{
RendererPolygon* rp = &PolygonList[i];
if (rp->PolyData->IsShadowMask)
{
// clear shadow bits in stencil buffer
glStencilMask(0x80);
glClear(GL_STENCIL_BUFFER_BIT);
// draw actual shadow mask
UseRenderShader(flags | RenderFlag_ShadowMask);
glDisable(GL_BLEND);
glColorMaski(0, GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
glColorMaski(1, GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
glDepthMask(GL_FALSE);
glDepthFunc(GL_LESS);
glStencilFunc(GL_ALWAYS, 0x80, 0x80);
glStencilOp(GL_KEEP, GL_REPLACE, GL_KEEP);
i += RenderPolygonBatch(i);
}
else if (rp->PolyData->Translucent)
{
bool needopaque = ((rp->PolyData->Attr & 0x001F0000) == 0x001F0000);
u32 polyattr = rp->PolyData->Attr;
u32 polyid = (polyattr >> 24) & 0x3F;
if (polyattr & (1<<14))
glDepthFunc(GL_LEQUAL);
else
glDepthFunc(GL_LESS);
if (needopaque)
{
UseRenderShader(flags);
glDisable(GL_BLEND);
glColorMaski(0, GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
glColorMaski(1, GL_TRUE, GL_TRUE, fogenable, GL_FALSE);
glStencilFunc(GL_ALWAYS, polyid, 0xFF);
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
glStencilMask(0xFF);
glDepthMask(GL_TRUE);
RenderSinglePolygon(i);