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SSAO math bug fixes

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This commit is contained in:
Magnus Norddahl 2016-10-06 07:36:49 +02:00
commit bb79dcb634
8 changed files with 126 additions and 84 deletions
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65
src/gl/renderer/gl_postprocess.cpp
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@ -124,7 +124,7 @@ CVAR(Float, gl_ssao_strength, 0.7, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
CVAR(Int, gl_ssao_debug, 0, 0)
CVAR(Float, gl_ssao_bias, 0.5f, 0)
CVAR(Float, gl_ssao_radius, 100.0f, 0)
CUSTOM_CVAR(Float, gl_ssao_blur_amount, 4.0f, 0)
CUSTOM_CVAR(Float, gl_ssao_blur_amount, 16.0f, 0)
{
if (self < 0.1f) self = 0.1f;
}
@ -178,6 +178,13 @@ void FGLRenderer::AmbientOccludeScene()
float blurSharpness = 1.0f / blurAmount;
float sceneScaleX = mSceneViewport.width / (float)mScreenViewport.width;
float sceneScaleY = mSceneViewport.height / (float)mScreenViewport.height;
float sceneOffsetX = mSceneViewport.left / (float)mScreenViewport.width;
float sceneOffsetY = mSceneViewport.top / (float)mScreenViewport.height;
int randomTexture = clamp(gl_ssao - 1, 0, FGLRenderBuffers::NumAmbientRandomTextures - 1);
// Calculate linear depth values
glBindFramebuffer(GL_FRAMEBUFFER, mBuffers->AmbientFB0);
glViewport(0, 0, mBuffers->AmbientWidth, mBuffers->AmbientHeight);
@ -196,8 +203,8 @@ void FGLRenderer::AmbientOccludeScene()
mLinearDepthShader->LinearizeDepthB.Set(MAX(1.0f / GetZNear(), 1.e-8f));
mLinearDepthShader->InverseDepthRangeA.Set(1.0f);
mLinearDepthShader->InverseDepthRangeB.Set(0.0f);
mLinearDepthShader->Scale.Set(mBuffers->AmbientWidth * 2.0f / (float)mScreenViewport.width, mBuffers->AmbientHeight * 2.0f / (float)mScreenViewport.height);
mLinearDepthShader->Offset.Set(mSceneViewport.left / (float)mScreenViewport.width, mSceneViewport.top / (float)mScreenViewport.height);
mLinearDepthShader->Scale.Set(sceneScaleX, sceneScaleY);
mLinearDepthShader->Offset.Set(sceneOffsetX, sceneOffsetY);
RenderScreenQuad();
// Apply ambient occlusion
@ -206,7 +213,7 @@ void FGLRenderer::AmbientOccludeScene()
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, mBuffers->AmbientRandomTexture);
glBindTexture(GL_TEXTURE_2D, mBuffers->AmbientRandomTexture[randomTexture]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
@ -219,44 +226,46 @@ void FGLRenderer::AmbientOccludeScene()
mSSAOShader->DepthTexture.Set(0);
mSSAOShader->RandomTexture.Set(1);
mSSAOShader->NormalTexture.Set(2);
mSSAOShader->UVToViewA.Set(2.0f * invFocalLenX, -2.0f * invFocalLenY);
mSSAOShader->UVToViewB.Set(-invFocalLenX, invFocalLenY);
mSSAOShader->UVToViewA.Set(2.0f * invFocalLenX, 2.0f * invFocalLenY);
mSSAOShader->UVToViewB.Set(-invFocalLenX, -invFocalLenY);
mSSAOShader->InvFullResolution.Set(1.0f / mBuffers->AmbientWidth, 1.0f / mBuffers->AmbientHeight);
mSSAOShader->NDotVBias.Set(nDotVBias);
mSSAOShader->NegInvR2.Set(-1.0f / r2);
mSSAOShader->RadiusToScreen.Set(aoRadius * 0.5 / tanHalfFovy * mBuffers->AmbientHeight);
mSSAOShader->AOMultiplier.Set(1.0f / (1.0f - nDotVBias));
mSSAOShader->AOStrength.Set(aoStrength);
mSSAOShader->Scale.Set(sceneScaleX, sceneScaleY);
mSSAOShader->Offset.Set(sceneOffsetX, sceneOffsetY);
RenderScreenQuad();
// Blur SSAO texture
glBindFramebuffer(GL_FRAMEBUFFER, mBuffers->AmbientFB0);
glBindTexture(GL_TEXTURE_2D, mBuffers->AmbientTexture1);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
mDepthBlurShader->Bind(false);
mDepthBlurShader->BlurSharpness[false].Set(blurSharpness);
mDepthBlurShader->InvFullResolution[false].Set(1.0f / mBuffers->AmbientWidth, 1.0f / mBuffers->AmbientHeight);
RenderScreenQuad();
if (gl_ssao_debug < 2)
{
glBindFramebuffer(GL_FRAMEBUFFER, mBuffers->AmbientFB0);
glBindTexture(GL_TEXTURE_2D, mBuffers->AmbientTexture1);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
mDepthBlurShader->Bind(false);
mDepthBlurShader->BlurSharpness[false].Set(blurSharpness);
mDepthBlurShader->InvFullResolution[false].Set(1.0f / mBuffers->AmbientWidth, 1.0f / mBuffers->AmbientHeight);
RenderScreenQuad();
glBindFramebuffer(GL_FRAMEBUFFER, mBuffers->AmbientFB1);
glBindTexture(GL_TEXTURE_2D, mBuffers->AmbientTexture0);
mDepthBlurShader->Bind(true);
mDepthBlurShader->BlurSharpness[true].Set(blurSharpness);
mDepthBlurShader->InvFullResolution[true].Set(1.0f / mBuffers->AmbientWidth, 1.0f / mBuffers->AmbientHeight);
mDepthBlurShader->PowExponent[true].Set(1.8f);
RenderScreenQuad();
glBindFramebuffer(GL_FRAMEBUFFER, mBuffers->AmbientFB1);
glBindTexture(GL_TEXTURE_2D, mBuffers->AmbientTexture0);
mDepthBlurShader->Bind(true);
mDepthBlurShader->BlurSharpness[true].Set(blurSharpness);
mDepthBlurShader->InvFullResolution[true].Set(1.0f / mBuffers->AmbientWidth, 1.0f / mBuffers->AmbientHeight);
mDepthBlurShader->PowExponent[true].Set(1.8f);
RenderScreenQuad();
}
// Add SSAO back to scene texture:
mBuffers->BindSceneFB(false);
glViewport(mSceneViewport.left, mSceneViewport.top, mSceneViewport.width, mSceneViewport.height);
glEnable(GL_BLEND);
glBlendEquation(GL_FUNC_ADD);
if (gl_ssao_debug > 1)
glBlendFunc(GL_ONE, GL_ZERO);
else
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
if (gl_ssao_debug == 1)
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
if (gl_ssao_debug != 0)
{
glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
@ -270,8 +279,8 @@ void FGLRenderer::AmbientOccludeScene()
mSSAOCombineShader->AODepthTexture.Set(0);
mSSAOCombineShader->SceneFogTexture.Set(1);
if (gl_multisample > 1) mSSAOCombineShader->SampleCount.Set(gl_multisample);
mSSAOCombineShader->Scale.Set(mBuffers->AmbientWidth * 2.0f / (float)mScreenViewport.width, mBuffers->AmbientHeight * 2.0f / (float)mScreenViewport.height);
mSSAOCombineShader->Offset.Set(mSceneViewport.left / (float)mScreenViewport.width, mSceneViewport.top / (float)mScreenViewport.height);
mSSAOCombineShader->Scale.Set(sceneScaleX, sceneScaleY);
mSSAOCombineShader->Offset.Set(sceneOffsetX, sceneOffsetY);
RenderScreenQuad();
FGLDebug::PopGroup();

44
src/gl/renderer/gl_renderbuffers.cpp
View file

@ -59,6 +59,11 @@ FGLRenderBuffers::FGLRenderBuffers()
mPipelineFB[i] = 0;
}
for (int i = 0; i < NumAmbientRandomTextures; i++)
{
AmbientRandomTexture[i] = 0;
}
glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*)&mOutputFB);
glGetIntegerv(GL_MAX_SAMPLES, &mMaxSamples);
}
@ -151,7 +156,8 @@ void FGLRenderBuffers::ClearAmbientOcclusion()
DeleteFrameBuffer(AmbientFB1);
DeleteTexture(AmbientTexture0);
DeleteTexture(AmbientTexture1);
DeleteTexture(AmbientRandomTexture);
for (int i = 0; i < NumAmbientRandomTextures; i++)
DeleteTexture(AmbientRandomTexture[i]);
}
void FGLRenderBuffers::DeleteTexture(GLuint &handle)
@ -368,25 +374,31 @@ void FGLRenderBuffers::CreateAmbientOcclusion(int width, int height)
AmbientFB0 = CreateFrameBuffer("AmbientFB0", AmbientTexture0);
AmbientFB1 = CreateFrameBuffer("AmbientFB1", AmbientTexture1);
int16_t randomValues[16 * 4];
// Must match quality enum in FSSAOShader::GetDefines
double numDirections[NumAmbientRandomTextures] = { 2.0, 4.0, 8.0 };
std::mt19937 generator(1337);
std::uniform_real_distribution<double> distribution(-1.0, 1.0);
for (int i = 0; i < 16; i++)
std::uniform_real_distribution<double> distribution(0.0, 1.0);
for (int quality = 0; quality < NumAmbientRandomTextures; quality++)
{
double num_directions = 8.0; // Must be same as the define in ssao.fp
double angle = 2.0 * M_PI * distribution(generator) / num_directions;
double x = cos(angle);
double y = sin(angle);
double z = distribution(generator);
double w = distribution(generator);
int16_t randomValues[16 * 4];
randomValues[i * 4 + 0] = (int16_t)clamp(x * 32767.0, -32768.0, 32767.0);
randomValues[i * 4 + 1] = (int16_t)clamp(y * 32767.0, -32768.0, 32767.0);
randomValues[i * 4 + 2] = (int16_t)clamp(z * 32767.0, -32768.0, 32767.0);
randomValues[i * 4 + 3] = (int16_t)clamp(w * 32767.0, -32768.0, 32767.0);
for (int i = 0; i < 16; i++)
{
double angle = 2.0 * M_PI * distribution(generator) / numDirections[quality];
double x = cos(angle);
double y = sin(angle);
double z = distribution(generator);
double w = distribution(generator);
randomValues[i * 4 + 0] = (int16_t)clamp(x * 32767.0, -32768.0, 32767.0);
randomValues[i * 4 + 1] = (int16_t)clamp(y * 32767.0, -32768.0, 32767.0);
randomValues[i * 4 + 2] = (int16_t)clamp(z * 32767.0, -32768.0, 32767.0);
randomValues[i * 4 + 3] = (int16_t)clamp(w * 32767.0, -32768.0, 32767.0);
}
AmbientRandomTexture[quality] = Create2DTexture("AmbientRandomTexture", GL_RGBA16_SNORM, 4, 4, randomValues);
}
AmbientRandomTexture = Create2DTexture("AmbientRandomTexture", GL_RGBA16_SNORM, 4, 4, randomValues);
}
//==========================================================================

3
src/gl/renderer/gl_renderbuffers.h
View file

@ -65,7 +65,8 @@ public:
GLuint AmbientFB1 = 0;
int AmbientWidth = 0;
int AmbientHeight = 0;
GLuint AmbientRandomTexture = 0;
enum { NumAmbientRandomTextures = 3 };
GLuint AmbientRandomTexture[NumAmbientRandomTextures];
static bool IsEnabled();

3
src/gl/shaders/gl_ambientshader.cpp
View file

@ -84,6 +84,8 @@ void FSSAOShader::Bind()
RadiusToScreen.Init(*mShader, "RadiusToScreen");
AOMultiplier.Init(*mShader, "AOMultiplier");
AOStrength.Init(*mShader, "AOStrength");
Scale.Init(*mShader, "Scale");
Offset.Init(*mShader, "Offset");
mMultisample = multisample;
}
mShader->Bind();
@ -91,6 +93,7 @@ void FSSAOShader::Bind()
FString FSSAOShader::GetDefines(int mode, bool multisample)
{
// Must match quality values in FGLRenderBuffers::CreateAmbientOcclusion
int numDirections, numSteps;
switch (gl_ssao)
{

2
src/gl/shaders/gl_ambientshader.h
View file

@ -39,6 +39,8 @@ public:
FBufferedUniform1f RadiusToScreen;
FBufferedUniform1f AOMultiplier;
FBufferedUniform1f AOStrength;
FBufferedUniform2f Scale;
FBufferedUniform2f Offset;
private:
enum Quality