void FPSCamera::FitToBox(const OpenGLAABox& box)
{
float look[3];
GLVec3Set(look, -view[2], -view[6], -view[10]);
GLVec3Add(look, position, look);
GLFitToBox(Near, Far, position, look, box);
}
void Render(float alpha, float elapsedtime)
{
float world[16];
float tmp[16];
float view[16];
float proj[16];
float viewproj[16];
float eye[3] = { 0, 0.3f, 8 };
float look[3] = { 0, 0.3f, 0 };
float up[3] = { 0, 1, 0 };
float clipplanes[2];
float orient[2];
cameraangle.smooth(orient, alpha);
GLMatrixRotationAxis(view, orient[1], 1, 0, 0);
GLMatrixRotationAxis(tmp, orient[0], 0, 1, 0);
GLMatrixMultiply(view, view, tmp);
GLVec3Transform(eye, eye, view);
GLFitToBox(clipplanes[0], clipplanes[1], eye, look, scenebox);
GLMatrixPerspectiveFovRH(proj, (60.0f * 3.14159f) / 180.f, (float)screenwidth / (float)screenheight, clipplanes[0], clipplanes[1]);
GLMatrixLookAtRH(view, eye, look, up);
GLMatrixMultiply(viewproj, view, proj);
// STEP 1: initialize header pointer buffer
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
glDisable(GL_DEPTH_TEST);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, headbuffer);
init->SetInt("screenWidth", screenwidth);
init->Begin();
{
screenquad->Draw();
}
init->End();
// STEP 2: collect transparent fragments into lists
glBindTexture(GL_TEXTURE_2D, white);
glBindBuffer(GL_ATOMIC_COUNTER_BUFFER, counterbuffer);
GLuint* counter = (GLuint*)glMapBuffer(GL_ATOMIC_COUNTER_BUFFER, GL_WRITE_ONLY);
*counter = 0;
glUnmapBuffer(GL_ATOMIC_COUNTER_BUFFER);
glBindBuffer(GL_ATOMIC_COUNTER_BUFFER, 0);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, nodebuffer);
glBindBufferBase(GL_ATOMIC_COUNTER_BUFFER, 0, counterbuffer);
collect->SetMatrix("matView", view);
collect->SetMatrix("matProj", proj);
collect->SetInt("screenWidth", screenwidth);
collect->Begin();
{
GLMatrixIdentity(world);
for( int i = 0; i < numobjects; ++i )
{
const SceneObject& obj = objects[i];
// scaling * rotation * translation
GLMatrixScaling(tmp, obj.scale[0], obj.scale[1], obj.scale[2]);
GLMatrixRotationAxis(world, obj.angle, 0, 1, 0);
GLMatrixMultiply(world, tmp, world);
GLMatrixTranslation(tmp, obj.position[0], obj.position[1], obj.position[2]);
GLMatrixMultiply(world, world, tmp);
collect->SetMatrix("matWorld", world);
collect->SetVector("matAmbient", &obj.color.r);
collect->CommitChanges();
if( obj.type == 0 )
box->DrawSubset(0);
else if( obj.type == 1 )
dragon->DrawSubset(0);
else if( obj.type == 2 )
buddha->DrawSubset(0);
}
}
collect->End();
glBindBufferBase(GL_ATOMIC_COUNTER_BUFFER, 0, 0);
// STEP 3: render
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
glMemoryBarrier(GL_SHADER_STORAGE_BARRIER_BIT);
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_SRC_ALPHA);
render->SetInt("screenWidth", screenwidth);
render->Begin();
{
screenquad->Draw();
}
render->End();
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, 0);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, 0);
glDisable(GL_BLEND);
glEnable(GL_DEPTH_TEST);
#ifdef _DEBUG
// check errors
GLenum err = glGetError();
if( err != GL_NO_ERROR )
std::cout << "Error\n";
#endif
SwapBuffers(hdc);
mousedx = mousedy = 0;
}
void Render(float alpha, float elapsedtime)
{
float tmp[16];
float texmat[16];
float view[16];
float viewinv[16];
float proj[16];
float viewproj[16];
float lightview[16];
float lightproj[16];
float lightviewproj[16];
float globalambient[4] = { 0.01f, 0.01f, 0.01f, 1.0f };
float moonlight[] = { -0.25f, 0.65f, -1, 0 };
float mooncolor[] = { 0.6f, 0.6f, 1, 1 };
float eye[3] = { 0, 0, 8 };
float look[3] = { 0, 0, 0 };
float up[3] = { 0, 1, 0 };
float screensize[2] = { (float)screenwidth, (float)screenheight };
float lightclip[2];
float clipplanes[2];
float orient[2];
// setup camera
cameraangle.smooth(orient, alpha);
GLMatrixRotationAxis(view, orient[1], 1, 0, 0);
GLMatrixRotationAxis(tmp, orient[0], 0, 1, 0);
GLMatrixMultiply(view, view, tmp);
GLVec3Transform(eye, eye, view);
GLFitToBox(clipplanes[0], clipplanes[1], eye, look, scenebox);
GLMatrixPerspectiveFovRH(proj, (60.0f * 3.14159f) / 180.f, (float)screenwidth / (float)screenheight, clipplanes[0], clipplanes[1]);
GLMatrixLookAtRH(view, eye, look, up);
GLMatrixMultiply(viewproj, view, proj);
// setup moonlight
GLMatrixInverse(viewinv, view);
GLVec3Transform(moonlight, moonlight, viewinv);
GLVec3Normalize(moonlight, moonlight);
// should be that value in view space (background is fix)
// but let y stay in world space, so we see shadow
moonlight[1] = 0.65f;
GLMatrixViewVector(lightview, moonlight);
GLFitToBox(lightproj, lightclip, lightview, scenebox);
GLMatrixMultiply(lightviewproj, lightview, lightproj);
// render shadow map
glClearColor(0, 0, 0, 1);
varianceshadow->SetMatrix("matViewProj", lightviewproj);
varianceshadow->SetVector("clipPlanes", lightclip);
shadowmap->Set();
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
varianceshadow->Begin();
{
RenderScene(varianceshadow);
}
varianceshadow->End();
}
shadowmap->Unset();
// blur it
float texelsize[] = { 1.0f / SHADOWMAP_SIZE, 1.0f / SHADOWMAP_SIZE };
glDepthMask(GL_FALSE);
glBindTexture(GL_TEXTURE_2D, shadowmap->GetColorAttachment(0));
boxblur3x3->SetVector("texelSize", texelsize);
blurredshadow->Set();
{
boxblur3x3->Begin();
{
screenquad->Draw();
}
boxblur3x3->End();
}
blurredshadow->Unset();
glDepthMask(GL_TRUE);
// STEP 1: z pass
ambient->SetMatrix("matViewProj", viewproj);
ambient->SetVector("matAmbient", globalambient);
framebuffer->Set();
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
// draw background first
glDisable(GL_DEPTH_TEST);
glDepthMask(GL_FALSE);
glBindTexture(GL_TEXTURE_2D, texture3);
float scaledx = 1360.0f * (screenheight / 768.0f);
float scale = screenwidth / scaledx;
GLMatrixTranslation(tmp, -0.5f, 0, 0);
GLMatrixScaling(texmat, scale, 1, 1);
GLMatrixMultiply(texmat, tmp, texmat);
GLMatrixTranslation(tmp, 0.5f, 0, 0);
GLMatrixMultiply(texmat, texmat, tmp);
GLMatrixRotationAxis(tmp, M_PI, 0, 0, 1);
GLMatrixMultiply(texmat, texmat, tmp);
basic2D->SetMatrix("matTexture", texmat);
basic2D->Begin();
{
screenquad->Draw();
}
basic2D->End();
glEnable(GL_DEPTH_TEST);
glDepthMask(GL_TRUE);
// then fill zbuffer
ambient->Begin();
{
RenderScene(ambient);
}
ambient->End();
}
framebuffer->Unset();
// STEP 2: cull lights
if( lightcull && timeout > DELAY )
{
lightcull->SetFloat("alpha", alpha);
lightcull->SetVector("clipPlanes", clipplanes);
lightcull->SetVector("screenSize", screensize);
lightcull->SetMatrix("matProj", proj);
lightcull->SetMatrix("matView", view);
lightcull->SetMatrix("matViewProj", viewproj);
glBindBuffer(GL_ATOMIC_COUNTER_BUFFER, counterbuffer);
GLuint* counter = (GLuint*)glMapBuffer(GL_ATOMIC_COUNTER_BUFFER, GL_WRITE_ONLY);
*counter = 0;
glUnmapBuffer(GL_ATOMIC_COUNTER_BUFFER);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, headbuffer);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, nodebuffer);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 2, lightbuffer);
glBindBufferBase(GL_ATOMIC_COUNTER_BUFFER, 0, counterbuffer);
glBindTexture(GL_TEXTURE_2D, framebuffer->GetDepthAttachment());
lightcull->Begin();
{
glDispatchCompute(workgroupsx, workgroupsy, 1);
}
lightcull->End();
glBindBufferBase(GL_ATOMIC_COUNTER_BUFFER, 0, 0);
glBindBuffer(GL_ATOMIC_COUNTER_BUFFER, 0);
glBindTexture(GL_TEXTURE_2D, 0);
}
// STEP 3: add some moonlight with shadow
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE);
glDepthMask(GL_FALSE);
framebuffer->Set();
shadowedlight->SetMatrix("matViewProj", viewproj);
shadowedlight->SetMatrix("lightViewProj", lightviewproj);
shadowedlight->SetVector("eyePos", eye);
shadowedlight->SetVector("lightPos", moonlight);
shadowedlight->SetVector("lightColor", mooncolor);
shadowedlight->SetVector("clipPlanes", lightclip);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, blurredshadow->GetColorAttachment(0));
glActiveTexture(GL_TEXTURE0);
shadowedlight->Begin();
{
RenderScene(shadowedlight);
}
shadowedlight->End();
// STEP 4: accumulate lighting
if( lightaccum && timeout > DELAY )
{
lightaccum->SetMatrix("matViewProj", viewproj);
lightaccum->SetVector("eyePos", eye);
lightaccum->SetFloat("alpha", alpha);
lightaccum->SetInt("numTilesX", workgroupsx);
lightaccum->Begin();
{
RenderScene(lightaccum);
}
lightaccum->End();
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, 0);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, 0);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 2, 0);
}
framebuffer->Unset();
glDisable(GL_BLEND);
glDepthMask(GL_TRUE);
// STEP 4: gamma correct
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glBindTexture(GL_TEXTURE_2D, framebuffer->GetColorAttachment(0));
gammacorrect->Begin();
{
screenquad->Draw();
}
gammacorrect->End();
#ifdef _DEBUG
// check errors
GLenum err = glGetError();
if( err != GL_NO_ERROR )
std::cout << "Error\n";
#endif
SwapBuffers(hdc);
mousedx = mousedy = 0;
}
