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UniformVariablesTest.cpp
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UniformVariablesTest.cpp
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#define _IRR_STATIC_LIB_
#include <irrlicht.h>
#include "../source/Irrlicht/COpenGLExtensionHandler.h"
const char *vS = R"(
#version 430 core
layout(location = 0) in vec4 pos;
layout(location = 1) in vec4 color;
uniform int time;
out vec4 vColor;
void main(){
gl_Position = pos + vec4(cos(time * 0.001), sin(time * 0.001), 0, 0);
vColor = color;
}
)";
const char *fS = R"(
#version 330 core
in vec4 vColor;
layout(location = 0) out vec4 color;
void main(){
color = vColor;
}
)";
using namespace irr;
class TestReceiver : public IEventReceiver{
public:
TestReceiver() {}
bool OnEvent(const SEvent &e) {
switch (e.KeyInput.Key) {
case KEY_KEY_Q:
exit(0);
return true;
}
return false;
}
};
class TestCallback : public video::IShaderConstantSetCallBack
{
public:
TestCallback() : timer(new irr::ITimer) {
}
virtual void PostLink(video::IMaterialRendererServices* services, const video::E_MATERIAL_TYPE& materialType, const core::vector<video::SConstantLocationNamePair>& constants) override {
core::vector<video::SConstantLocationNamePair>::const_iterator iter;
for (iter = constants.begin(); iter < constants.end(); ++iter) {
uniforms.push_back(*iter);
}
}
virtual void OnSetConstants(video::IMaterialRendererServices *services, int32_t userData) override {
int time = timer->getRealTime();
core::vector<video::SConstantLocationNamePair>::const_iterator iter;
for (iter = uniforms.begin(); iter < uniforms.end(); ++iter) {
if (iter->name == "time")
services->setShaderConstant(&time, iter->location, iter->type);
}
}
virtual void OnUnsetMaterial() {}
protected:
core::vector<video::SConstantLocationNamePair> uniforms;
irr::ITimer *timer;
};
#include "irr/irrunpack.h"
struct VertexLayout{
float pos[3];
float color[3];
} PACK_STRUCT;
#include "irr/irrpack.h"
video::IGPUMeshBuffer *createTestQuad(video::IVideoDriver *driver) {
VertexLayout vertexData[4];
vertexData[0] = { 0.25f, 0.25f, 0.0f, 1.0f, 0.0f, 0.0f };
vertexData[1] = { 0.25f, -0.25f, 0.0f, 0.0f, 1.0f, 0.0f };
vertexData[2] = { -0.25f, -0.25f, 0.0f, 0.0f, 0.0f, 1.0f };
vertexData[3] = { -0.25f, 0.25f, 0.0f, 0.0f, 0.0f, 0.0f };
uint16_t indexData[] = { 0,1,2, 0,2,3 };
auto upBuf = driver->getDefaultUpStreamingBuffer();
const void *dataToPlace[] = { vertexData, indexData };
uint32_t offsets[2] = { video::StreamingTransientDataBufferMT<>::invalid_address,
video::StreamingTransientDataBufferMT<>::invalid_address };
uint32_t alignments[2] = { sizeof(decltype(vertexData[0u])),
sizeof(decltype(indexData[0u]))};
uint32_t sizes[2] = { sizeof(vertexData), sizeof(indexData) };
upBuf->multi_place(2u, (const void* const*)dataToPlace, (uint32_t*)offsets, (uint32_t*)sizes, (uint32_t*)alignments);
if (upBuf->needsManualFlushOrInvalidate())
{
auto upStreamMem = upBuf->getBuffer()->getBoundMemory();
driver->flushMappedMemoryRanges({ video::IDriverMemoryAllocation::MappedMemoryRange(upStreamMem,offsets[0],sizes[0]),video::IDriverMemoryAllocation::MappedMemoryRange(upStreamMem,offsets[1],sizes[1]) });
}
auto buf = upBuf->getBuffer();
video::IGPUMeshDataFormatDesc* desc = driver->createGPUMeshDataFormatDesc();
desc->setVertexAttrBuffer(buf, asset::EVAI_ATTR0, asset::EF_R32G32B32_SFLOAT, sizeof(VertexLayout), offsetof(VertexLayout, pos[0]) + offsets[0]);
desc->setVertexAttrBuffer(buf, asset::EVAI_ATTR1, asset::EF_R32G32B32_SFLOAT, sizeof(VertexLayout), offsetof(VertexLayout, color[0]) + offsets[0]);
desc->setIndexBuffer(buf);
video::IGPUMeshBuffer *mb = new video::IGPUMeshBuffer();
mb->setMeshDataAndFormat(desc);
mb->setIndexBufferOffset(offsets[1]);
mb->setIndexType(asset::EIT_16BIT);
mb->setIndexCount(6);
desc->drop();
return mb;
}
int main(){
// create device with full flexibility over creation parameters
// you can add more parameters if desired, check irr::SIrrlichtCreationParameters
irr::SIrrlichtCreationParameters params;
params.Bits = 24; //may have to set to 32bit for some platforms
params.ZBufferBits = 24; //we'd like 32bit here
params.DriverType = video::EDT_OPENGL; //! Only Well functioning driver, software renderer left for sake of 2D image drawing
params.WindowSize = core::dimension2d<uint32_t>(1280, 720);
params.Fullscreen = false;
params.Vsync = true; //! If supported by target platform
params.Doublebuffer = true;
params.Stencilbuffer = false; //! This will not even be a choice soon
params.AuxGLContexts = 16;
IrrlichtDevice* device = createDeviceEx(params);
if (device == 0)
return 1; // could not create selected driver.
TestReceiver eventMgr;
device->setEventReceiver(&eventMgr);
video::IVideoDriver* driver = device->getVideoDriver();
TestCallback *cb = new TestCallback;
video::SGPUMaterial material;
material.MaterialType = (video::E_MATERIAL_TYPE)driver->getGPUProgrammingServices()->addHighLevelShaderMaterial(
vS, nullptr, nullptr, nullptr, fS, 3, video::EMT_SOLID, cb, 0);
material.BackfaceCulling = false;
cb->drop();
video::IGPUMeshBuffer *mb = createTestQuad(driver);
scene::ISceneManager* smgr = device->getSceneManager();
uint64_t lastFPSTime = 0;
while(device->run())
if (device->isWindowActive()){
driver->beginScene(true, true, video::SColor(0,0,0,0) ); //this gets 11k FPS
driver->setTransform(video::E4X3TS_WORLD, core::matrix4x3());
driver->setMaterial(material);
driver->drawMeshBuffer(mb);
driver->endScene();
// display frames per second in window title
uint64_t time = device->getTimer()->getRealTime();
if (time-lastFPSTime > 1000){
std::wostringstream str(L"Hello World - Irrlicht Engine [");
str.seekp(0,std::ios_base::end);
str << driver->getName() << "] FPS:" << driver->getFPS() << " PrimitivesDrawn: " << driver->getPrimitiveCountDrawn();
device->setWindowCaption(str.str());
lastFPSTime = time;
}
}
//create a screenshot
video::IImage* screenshot = driver->createImage(asset::EF_B8G8R8A8_UNORM,params.WindowSize);
glReadPixels(0,0, params.WindowSize.Width,params.WindowSize.Height, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, screenshot->getData());{
// images are horizontally flipped, so we have to fix that here.
uint8_t* pixels = (uint8_t*)screenshot->getData();
const int32_t pitch=screenshot->getPitch();
uint8_t* p2 = pixels + (params.WindowSize.Height - 1) * pitch;
uint8_t* tmpBuffer = new uint8_t[pitch];
for (uint32_t i=0; i < params.WindowSize.Height; i += 2){
memcpy(tmpBuffer, pixels, pitch);
memcpy(pixels, p2, pitch);
memcpy(p2, tmpBuffer, pitch);
pixels += pitch;
p2 -= pitch;
}
delete [] tmpBuffer;
}
asset::CImageData* img = new asset::CImageData(screenshot);
asset::IAssetWriter::SAssetWriteParams wparams(img);
device->getAssetManager().writeAsset("screenshot.png", wparams);
img->drop();
screenshot->drop();
mb->drop();
device->drop();
return 0;
}