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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "SkyBox.h"
#include "Rendering/GlobalRendering.h"
#include "Rendering/GL/myGL.h"
#include "Rendering/Textures/Bitmap.h"
#include "Game/Camera.h"
#include "System/float3.h"
#include "System/Log/ILog.h"
#define LOG_SECTION_SKY_BOX "SkyBox"
LOG_REGISTER_SECTION_GLOBAL(LOG_SECTION_SKY_BOX)
// use the specific section for all LOG*() calls in this source file
#ifdef LOG_SECTION_CURRENT
#undef LOG_SECTION_CURRENT
#endif
#define LOG_SECTION_CURRENT LOG_SECTION_SKY_BOX
// between 1 and 4 drawcalls per frame (opaque, water, env * 2)
// each call updates 6 vertices using a different camera and is
// double-buffered; this means buffer size must be the smallest
// common multiple of {1,2,3,4} to avoid flickering
static constexpr unsigned int SKYBOX_VERTEX_CNT = 6 * (2 * 3);
static constexpr unsigned int SKYBOX_BUFFER_LEN = SKYBOX_VERTEX_CNT * 2;
static_assert((SKYBOX_BUFFER_LEN % 4) == 0, "");
CSkyBox::CSkyBox(const std::string& texture)
{
LoadTexture(texture);
LoadBuffer();
}
CSkyBox::~CSkyBox()
{
(skyBox.GetBuffer())->Kill();
}
void CSkyBox::LoadTexture(const std::string& texture)
{
#ifndef HEADLESS
CBitmap btex;
if (!btex.Load(texture) || btex.textype != GL_TEXTURE_CUBE_MAP) {
LOG_L(L_WARNING, "could not load skybox texture from file %s", texture.c_str());
return;
}
skyTex.SetRawTexID(btex.CreateTexture());
skyTex.SetRawSize(int2(btex.xsize, btex.ysize));
glBindTexture(GL_TEXTURE_CUBE_MAP, skyTex.GetID());
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
#endif
}
void CSkyBox::LoadBuffer()
{
#ifndef HEADLESS
const std::string& vsText = Shader::GetShaderSource("GLSL/SkyBoxVertProg.glsl");
const std::string& fsText = Shader::GetShaderSource("GLSL/SkyBoxFragProg.glsl");
const std::array<SkyBoxAttrType, 2> vertAttrs = {{
{0, 2, GL_FLOAT, (sizeof(float) * 5), "a_vertex_xy" , VA_TYPE_OFFSET(float, 0)},
{1, 3, GL_FLOAT, (sizeof(float) * 5), "a_texcoor_xyz", VA_TYPE_OFFSET(float, 2)},
}};
static GL::RenderDataBuffer skyBuf;
skyBuf.Kill();
skyBox.Setup(&skyBuf, &vertAttrs, SKYBOX_BUFFER_LEN, 0);
Shader::GLSLShaderObject shaderObjs[2] = {{GL_VERTEX_SHADER, vsText, ""}, {GL_FRAGMENT_SHADER, fsText, ""}};
Shader::IProgramObject* shaderProg = skyBuf.CreateShader((sizeof(shaderObjs) / sizeof(shaderObjs[0])), 0, &shaderObjs[0], nullptr);
shaderProg->Enable();
shaderProg->SetUniform("u_skycube_tex", 0);
shaderProg->SetUniform("u_gamma_exponent", globalRendering->gammaExponent);
shaderProg->SetUniformMatrix4x4<float>("u_movi_mat", false, CMatrix44f::Identity());
shaderProg->SetUniformMatrix4x4<float>("u_proj_mat", false, CMatrix44f::ClipOrthoProj01(globalRendering->supportClipSpaceControl * 1.0f));
shaderProg->Disable();
vtxPtr = skyBox.GetElemsMap();
vtxPos = vtxPtr;
memset(vtxPos, 0, SKYBOX_BUFFER_LEN * sizeof(SkyBoxVertType));
#endif
}
void CSkyBox::Draw(Game::DrawMode mode)
{
#ifndef HEADLESS
if (!globalRendering->drawSky)
return;
glAttribStatePtr->DisableBlendMask();
glAttribStatePtr->DisableDepthMask();
glAttribStatePtr->DisableDepthTest();
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_CUBE_MAP, skyTex.GetID());
SkyBoxBuffer* buffer = &skyBox;
Shader::IProgramObject* shader = buffer->GetShader();
{
if (vtxPos == vtxPtr)
buffer->Wait();
*(vtxPos++) = {{0.0f, 1.0f}, -camera->CalcPixelDir( 0, 0)};
*(vtxPos++) = {{1.0f, 1.0f}, -camera->CalcPixelDir(globalRendering->viewSizeX, 0)};
*(vtxPos++) = {{1.0f, 0.0f}, -camera->CalcPixelDir(globalRendering->viewSizeX, globalRendering->viewSizeY)};
*(vtxPos++) = {{1.0f, 0.0f}, -camera->CalcPixelDir(globalRendering->viewSizeX, globalRendering->viewSizeY)};
*(vtxPos++) = {{0.0f, 0.0f}, -camera->CalcPixelDir( 0, globalRendering->viewSizeY)};
*(vtxPos++) = {{0.0f, 1.0f}, -camera->CalcPixelDir( 0, 0)};
}
{
shader->Enable();
shader->SetUniform("u_gamma_exponent", globalRendering->gammaExponent);
buffer->Submit(GL_TRIANGLES, (((vtxPos - 6) - vtxPtr) + SKYBOX_VERTEX_CNT) % SKYBOX_BUFFER_LEN, 6);
shader->Disable();
}
// wraparound
if ((vtxPos - vtxPtr) >= SKYBOX_BUFFER_LEN)
vtxPos = vtxPtr;
if (vtxPos == vtxPtr)
buffer->Sync();
glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
glAttribStatePtr->EnableDepthMask();
glAttribStatePtr->EnableDepthTest();
#endif
}
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