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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "GeometryBuffer.h"
#include "RenderDataBuffer.hpp"
#include "Rendering/GlobalRendering.h"
#include "System/Config/ConfigHandler.h"
#include <algorithm>
#include <cstring> // memset
void GL::GeometryBuffer::Init(bool ctor) {
// if dead, this must be a non-ctor reload
assert(!dead || !ctor);
memset(&bufferTextureIDs[0], 0, sizeof(bufferTextureIDs));
memset(&bufferAttachments[0], 0, sizeof(bufferAttachments));
// NOTE:
// initial buffer size must be 0 s.t. prevSize != currSize when !init
// (Lua can toggle drawDeferred and might be the first to cause a call
// to Create)
prevBufferSize = GetWantedSize(false);
currBufferSize = GetWantedSize(true);
dead = false;
bound = false;
msaa = configHandler->GetBool("AllowMultiSampledFrameBuffers");
}
void GL::GeometryBuffer::Kill(bool dtor) {
if (dead) {
// if already dead, this must be final cleanup
assert(dtor);
return;
}
if (buffer.IsValid())
DetachTextures(false);
dead = true;
}
void GL::GeometryBuffer::Clear() const {
assert(bound);
glAttribStatePtr->ClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glAttribStatePtr->Clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}
void GL::GeometryBuffer::SetDepthRange(float nearDepth, float farDepth) const {
#if 0
if (globalRendering->supportClipSpaceControl) {
// TODO: need to inform shaders about this, modify PM instead
glAttribStatePtr->DepthRange(nearDepth, farDepth);
glAttribStatePtr->ClearDepth(farDepth);
glAttribStatePtr->DepthFunc((nearDepth <= farDepth)? GL_LEQUAL: GL_GREATER);
}
#else
glAttribStatePtr->ClearDepth(std::max(nearDepth, farDepth));
glAttribStatePtr->DepthFunc(GL_LEQUAL);
#endif
}
void GL::GeometryBuffer::DetachTextures(const bool init) {
// nothing to detach yet during init
if (init)
return;
buffer.Bind();
// detach only actually attached textures, ATI drivers might crash
for (unsigned int i = 0; i < (ATTACHMENT_COUNT - 1); ++i) {
buffer.Detach(GL_COLOR_ATTACHMENT0 + i);
}
buffer.Detach(GL_DEPTH_ATTACHMENT);
buffer.Unbind();
glDeleteTextures(ATTACHMENT_COUNT, &bufferTextureIDs[0]);
// return to incomplete state
memset(&bufferTextureIDs[0], 0, sizeof(bufferTextureIDs));
memset(&bufferAttachments[0], 0, sizeof(bufferAttachments));
}
void GL::GeometryBuffer::DrawDebug(const unsigned int texID, const float2 texMins, const float2 texMaxs) const {
GL::RenderDataBuffer2DT* buffer = GL::GetRenderBuffer2DT();
Shader::IProgramObject* shader = buffer->GetShader();
// FIXME: needs resolve or different shader if msaa
glActiveTexture(GL_TEXTURE0);
glBindTexture(GetTextureTarget(), texID);
shader->Enable();
shader->SetUniformMatrix4x4<float>("u_movi_mat", false, CMatrix44f::Identity());
shader->SetUniformMatrix4x4<float>("u_proj_mat", false, CMatrix44f::Identity());
buffer->SafeAppend({texMins.x, texMins.y, texMins.x, texMins.y}); // tl
buffer->SafeAppend({texMaxs.x, texMins.y, texMaxs.x, texMins.y}); // tr
buffer->SafeAppend({texMaxs.x, texMaxs.y, texMaxs.x, texMaxs.y}); // br
buffer->SafeAppend({texMaxs.x, texMaxs.y, texMaxs.x, texMaxs.y}); // br
buffer->SafeAppend({texMins.x, texMaxs.y, texMins.x, texMaxs.y}); // bl
buffer->SafeAppend({texMins.x, texMins.y, texMins.x, texMins.y}); // tl
buffer->Submit(GL_TRIANGLES);
shader->Disable();
glBindTexture(GetTextureTarget(), 0);
}
bool GL::GeometryBuffer::Create(const int2 size) {
const unsigned int texTarget = GetTextureTarget();
for (unsigned int n = 0; n < ATTACHMENT_COUNT; n++) {
glGenTextures(1, &bufferTextureIDs[n]);
glBindTexture(texTarget, bufferTextureIDs[n]);
glTexParameteri(texTarget, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
glTexParameteri(texTarget, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
glTexParameteri(texTarget, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(texTarget, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
if (n == ATTACHMENT_ZVALTEX) {
if (texTarget == GL_TEXTURE_2D)
glTexImage2D(texTarget, 0, GL_DEPTH_COMPONENT32F, size.x, size.y, 0, GL_DEPTH_COMPONENT, GL_FLOAT, nullptr);
else
glTexImage2DMultisample(texTarget, globalRendering->msaaLevel, GL_DEPTH_COMPONENT32F, size.x, size.y, GL_TRUE);
bufferAttachments[n] = GL_DEPTH_ATTACHMENT;
} else {
if (texTarget == GL_TEXTURE_2D)
glTexImage2D(texTarget, 0, GL_RGBA, size.x, size.y, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
else
glTexImage2DMultisample(texTarget, globalRendering->msaaLevel, GL_RGBA8, size.x, size.y, GL_TRUE);
bufferAttachments[n] = GL_COLOR_ATTACHMENT0 + n;
}
}
// sic; Mesa complains about an incomplete FBO if calling Bind before TexImage (?)
buffer.Bind();
buffer.AttachTextures(bufferTextureIDs, bufferAttachments, texTarget, ATTACHMENT_COUNT);
glBindTexture(texTarget, 0);
// define the attachments we are going to draw into
// note: the depth-texture attachment does not count
// here and will be GL_NONE implicitly!
glDrawBuffers(ATTACHMENT_COUNT - 1, &bufferAttachments[0]);
// FBO must have been valid from point of construction
// if we reached CreateGeometryBuffer, but CheckStatus
// can still invalidate it
assert(buffer.IsValid());
const bool ret = buffer.CheckStatus(name);
buffer.Unbind();
return ret;
}
bool GL::GeometryBuffer::Update(const bool init) {
currBufferSize = GetWantedSize(true);
// FBO must be valid from point of construction
if (!buffer.IsValid())
return false;
// buffer isn't bound by calling context, can not call
// GetStatus to check for GL_FRAMEBUFFER_COMPLETE here
//
if (HasAttachments()) {
// technically a buffer can not be complete yet during
// initialization, however the GL spec says that FBO's
// with only empty attachments are complete by default
// assert(!init);
// FBO was already initialized (during init or from Lua)
// so it will have attachments -> check if they need to
// be regenerated, eg. if a window resize event happened
if (prevBufferSize == currBufferSize)
return true;
DetachTextures(init);
}
return (Create(prevBufferSize = currBufferSize));
}
int2 GL::GeometryBuffer::GetWantedSize(bool allowed) const {
return {globalRendering->viewSizeX * allowed, globalRendering->viewSizeY * allowed};
}
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