void initGl() {
GlfwApp::initGl();
frameBuffer.init(eyeSize);
quadGeometry = GlUtils::getQuadGeometry();
distortProgram = GlUtils::getProgram(
Resource::SHADERS_VERTEXTORIFT_VS,
Resource::SHADERS_DIRECTDISTORT_FS);
distortProgram->use();
distortProgram->setUniform("Aspect", eyeAspect);
distortProgram->setUniform("PostDistortionScale", postDistortionScale);
distortProgram->setUniform("K", distortionCoefficients);
gl::Program::clear();
}
void draw() {
glClearColor(0, 1, 0, 1);
glClear(GL_COLOR_BUFFER_BIT);
GL_CHECK_ERROR;
for (int i = 0; i < 2; ++i) {
const EyeArg & eyeArg = eyeArgs[i];
frameBuffer.activate();
renderScene(eyeArg);
frameBuffer.deactivate();
glDisable(GL_DEPTH_TEST);
glDisable(GL_BLEND);
gl::viewport(eyeArg.viewportLocation, eyeSize);
distortProgram->use();
distortProgram->setUniform("LensOffset", eyeArg.lensOffset);
frameBuffer.color->bind();
quadGeometry->bindVertexArray();
quadGeometry->draw();
gl::Geometry::unbindVertexArray();
gl::Program::clear();
}
}
void draw() {
static int frameIndex = 0;
ovrFrameTiming timing = ovrHmd_BeginFrameTiming(hmd, frameIndex++);
for (int i = 0; i < 2; ++i) {
const ovrEyeType eye = hmdDesc.EyeRenderOrder[i];
const EyeArg & eyeArg = eyeArgs[eye];
// Set up the per-eye projection matrix
gl::Stacks::projection().top() = eyeArg.projection;
eyeArg.frameBuffer.activate();
gl::MatrixStack & mv = gl::Stacks::modelview();
gl::Stacks::with_push([&]{
ovrSensorState ss = ovrHmd_GetSensorState(hmd, timing.EyeScanoutSeconds[eye]);
// Set up the per-eye modelview matrix
// Apply the head pose
mv.preMultiply(glm::inverse(Rift::fromOvr(ss.Predicted.Pose)));
// Apply the per-eye offset
mv.preMultiply(eyeArg.viewOffset);
renderScene();
});
eyeArg.frameBuffer.deactivate();
}
glClearColor(0, 0, 1, 1);
glClear(GL_COLOR_BUFFER_BIT);
glDisable(GL_BLEND);
glDisable(GL_CULL_FACE);
glDisable(GL_DEPTH_TEST);
distortionProgram->use();
glViewport(0, 0, windowSize.x, windowSize.y);
for_each_eye([&](ovrEyeType eye) {
const EyeArg & eyeArg = eyeArgs[eye];
distortionProgram->setUniform(0, eyeArg.scale);
distortionProgram->setUniform(1, eyeArg.offset);
eyeArg.frameBuffer.color->bind();
eyeArg.meshVao->bind();
glDrawElements(GL_TRIANGLES, eyeArg.mesh.IndexCount,
GL_UNSIGNED_SHORT, nullptr);
});
gl::Texture2d::unbind();
gl::Program::clear();
ovrHmd_EndFrameTiming(hmd);
glEnable(GL_CULL_FACE);
glEnable(GL_DEPTH_TEST);
}
void renderLatencyTestSquare() {
OVR::Color colorToDisplay;
// If this returns a non-0 value, we're performing a latency
// test and must render a colored square underneath the tester
// (On the lens axis)
if (ovrLatencyTest.DisplayScreenColor(colorToDisplay)) {
latencyTestProgram->use();
latencyTestProgram->setUniform("Color", Rift::fromOvr(colorToDisplay));
gl::MatrixStack & mv = gl::Stacks::modelview();
glDisable(GL_DEPTH_TEST);
mv.with_push([&]{
mv.identity().translate(glm::vec3(0, 0, -0.1f)).scale(0.005f);
GlUtils::renderGeometry(latencyTestQuad, latencyTestProgram);
});
glEnable(GL_DEPTH_TEST);
}
}