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The other part of the Oculus ambient occlusion fix.

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This commit is contained in:
Andrzej Kapolka 2013-11-26 17:53:31 -08:00
parent e406988ed3
commit f6b3a6ceca
3 changed files with 24 additions and 11 deletions

8
interface/resources/shaders/ambient_occlusion.frag
View file

@ -30,6 +30,12 @@ uniform vec2 leftBottom;
// the right and top edges of the view window
uniform vec2 rightTop;
// an offset value to apply to the texture coordinates
uniform vec2 texCoordOffset;
// a scale value to apply to the texture coordinates
uniform vec2 texCoordScale;
// the radius of the effect
uniform float radius;
@ -38,7 +44,7 @@ uniform vec2 noiseScale;
// given a texture coordinate, returns the 3D view space z coordinate
float texCoordToViewSpaceZ(vec2 texCoord) {
return (far * near) / (texture2D(depthTexture, texCoord).r * (far - near) - far);
return (far * near) / (texture2D(depthTexture, texCoord * texCoordScale + texCoordOffset).r * (far - near) - far);
}
// given a texture coordinate, returns the 3D view space coordinate

25
interface/src/renderer/AmbientOcclusionEffect.cpp
View file

@ -57,6 +57,8 @@ void AmbientOcclusionEffect::init() {
_leftBottomLocation = _occlusionProgram->uniformLocation("leftBottom");
_rightTopLocation = _occlusionProgram->uniformLocation("rightTop");
_noiseScaleLocation = _occlusionProgram->uniformLocation("noiseScale");
_texCoordOffsetLocation = _occlusionProgram->uniformLocation("texCoordOffset");
_texCoordScaleLocation = _occlusionProgram->uniformLocation("texCoordScale");
// generate the random rotation texture
glGenTextures(1, &_rotationTextureID);
@ -106,22 +108,25 @@ void AmbientOcclusionEffect::render() {
Application::getInstance()->computeOffAxisFrustum(
left, right, bottom, top, nearVal, farVal, nearClipPlane, farClipPlane);
int viewport[4];
glGetIntegerv(GL_VIEWPORT, viewport);
const int VIEWPORT_X_INDEX = 0;
const int VIEWPORT_WIDTH_INDEX = 2;
QSize widgetSize = Application::getInstance()->getGLWidget()->size();
float sMin = viewport[VIEWPORT_X_INDEX] / (float)widgetSize.width();
float sWidth = viewport[VIEWPORT_WIDTH_INDEX] / (float)widgetSize.width();
_occlusionProgram->bind();
_occlusionProgram->setUniformValue(_nearLocation, nearVal);
_occlusionProgram->setUniformValue(_farLocation, farVal);
_occlusionProgram->setUniformValue(_leftBottomLocation, left, bottom);
_occlusionProgram->setUniformValue(_rightTopLocation, right, top);
QSize widgetSize = Application::getInstance()->getGLWidget()->size();
_occlusionProgram->setUniformValue(_noiseScaleLocation, widgetSize.width() / (float)ROTATION_WIDTH,
_occlusionProgram->setUniformValue(_noiseScaleLocation, viewport[VIEWPORT_WIDTH_INDEX] / (float)ROTATION_WIDTH,
widgetSize.height() / (float)ROTATION_HEIGHT);
_occlusionProgram->setUniformValue(_texCoordOffsetLocation, sMin, 0.0f);
_occlusionProgram->setUniformValue(_texCoordScaleLocation, sWidth, 1.0f);
int viewport[4];
glGetIntegerv(GL_VIEWPORT, viewport);
const int VIEWPORT_X_INDEX = 0;
const int VIEWPORT_WIDTH_INDEX = 2;
float sMin = viewport[VIEWPORT_X_INDEX] / (float)widgetSize.width();
float sMax = (viewport[VIEWPORT_X_INDEX] + viewport[VIEWPORT_WIDTH_INDEX]) / (float)widgetSize.width();
renderFullscreenQuad(sMin, sMax);
renderFullscreenQuad();
_occlusionProgram->release();
@ -141,7 +146,7 @@ void AmbientOcclusionEffect::render() {
_blurProgram->bind();
_blurProgram->setUniformValue(_blurScaleLocation, 1.0f / widgetSize.width(), 1.0f / widgetSize.height());
renderFullscreenQuad(sMin, sMax);
renderFullscreenQuad(sMin, sMin + sWidth);
_blurProgram->release();

2
interface/src/renderer/AmbientOcclusionEffect.h
View file

@ -30,6 +30,8 @@ private:
int _leftBottomLocation;
int _rightTopLocation;
int _noiseScaleLocation;
int _texCoordOffsetLocation;
int _texCoordScaleLocation;
ProgramObject* _blurProgram;
int _blurScaleLocation;